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<p class="caption" role="heading"><span class="caption-text">ํ์ดํ ์น(PyTorch) ๋ ์ํผ</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../recipes/recipes_index.html">๋ชจ๋ ๋ ์ํผ ๋ณด๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../prototype/prototype_index.html">๋ชจ๋ ํ๋กํ ํ์
๋ ์ํผ ๋ณด๊ธฐ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">ํ์ดํ ์น(PyTorch) ์์ํ๊ธฐ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/intro.html">ํ์ดํ ์น(PyTorch) ๊ธฐ๋ณธ ์ตํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/quickstart_tutorial.html">๋น ๋ฅธ ์์(Quickstart)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/tensorqs_tutorial.html">ํ
์(Tensor)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/data_tutorial.html">Dataset๊ณผ DataLoader</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/transforms_tutorial.html">๋ณํ(Transform)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/buildmodel_tutorial.html">์ ๊ฒฝ๋ง ๋ชจ๋ธ ๊ตฌ์ฑํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/autogradqs_tutorial.html"><code class="docutils literal notranslate"><span class="pre">torch.autograd</span></code>๋ฅผ ์ฌ์ฉํ ์๋ ๋ฏธ๋ถ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/optimization_tutorial.html">๋ชจ๋ธ ๋งค๊ฐ๋ณ์ ์ต์ ํํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/basics/saveloadrun_tutorial.html">๋ชจ๋ธ ์ ์ฅํ๊ณ ๋ถ๋ฌ์ค๊ธฐ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">Introduction to PyTorch on YouTube</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt.html">PyTorch ์๊ฐ - YouTube ์๋ฆฌ์ฆ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/introyt1_tutorial.html">PyTorch ์๊ฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/tensors_deeper_tutorial.html">Pytorch Tensor ์๊ฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/autogradyt_tutorial.html">The Fundamentals of Autograd</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/modelsyt_tutorial.html">Building Models with PyTorch</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/tensorboardyt_tutorial.html">PyTorch TensorBoard Support</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/trainingyt.html">Training with PyTorch</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/captumyt.html">Model Understanding with Captum</a></li>
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<p class="caption" role="heading"><span class="caption-text">ํ์ดํ ์น(PyTorch) ๋ฐฐ์ฐ๊ธฐ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/deep_learning_60min_blitz.html">PyTorch๋ก ๋ฅ๋ฌ๋ํ๊ธฐ: 60๋ถ๋ง์ ๋์ฅ๋ด๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/pytorch_with_examples.html">์์ ๋ก ๋ฐฐ์ฐ๋ ํ์ดํ ์น(PyTorch)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/nn_tutorial.html"><cite>torch.nn</cite> ์ด <em>์ค์ ๋ก</em> ๋ฌด์์ธ๊ฐ์?</a></li>
<li class="toctree-l1"><a class="reference internal" href="tensorboard_tutorial.html">TensorBoard๋ก ๋ชจ๋ธ, ๋ฐ์ดํฐ, ํ์ต ์๊ฐํํ๊ธฐ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">์ด๋ฏธ์ง/๋น๋์ค</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="torchvision_tutorial.html">TorchVision ๊ฐ์ฒด ๊ฒ์ถ ๋ฏธ์ธ์กฐ์ (Finetuning) ํํ ๋ฆฌ์ผ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/transfer_learning_tutorial.html">์ปดํจํฐ ๋น์ (Vision)์ ์ํ ์ ์ดํ์ต(Transfer Learning)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/fgsm_tutorial.html">์ ๋์ ์์ ์์ฑ(Adversarial Example Generation)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/dcgan_faces_tutorial.html">DCGAN ํํ ๋ฆฌ์ผ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/vt_tutorial.html">๋ฐฐํฌ๋ฅผ ์ํ ๋น์ ํธ๋์คํฌ๋จธ(Vision Transformer) ๋ชจ๋ธ ์ต์ ํํ๊ธฐ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">์ค๋์ค</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/audio_io_tutorial.html">Audio I/O</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/audio_resampling_tutorial.html">Audio Resampling</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/audio_data_augmentation_tutorial.html">Audio Data Augmentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/audio_feature_extractions_tutorial.html">Audio Feature Extractions</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/audio_feature_augmentation_tutorial.html">Audio Feature Augmentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/audio_datasets_tutorial.html">Audio Datasets</a></li>
<li class="toctree-l1"><a class="reference internal" href="speech_recognition_pipeline_tutorial.html">Speech Recognition with Wav2Vec2</a></li>
<li class="toctree-l1"><a class="reference internal" href="text_to_speech_with_torchaudio.html">Text-to-speech with Tacotron2</a></li>
<li class="toctree-l1"><a class="reference internal" href="forced_alignment_with_torchaudio_tutorial.html">wav2vec2์ ์ด์ฉํ ๊ฐ์ ์ ๋ ฌ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">ํ
์คํธ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/transformer_tutorial.html"><code class="docutils literal notranslate"><span class="pre">nn.Transformer</span></code> ์ torchtext๋ก ์ํ์ค-ํฌ-์ํ์ค(Sequence-to-Sequence) ๋ชจ๋ธ๋งํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/bettertransformer_tutorial.html">Fast Transformer Inference with Better Transformer</a></li>
<li class="toctree-l1"><a class="reference internal" href="char_rnn_classification_tutorial.html">๊ธฐ์ด๋ถํฐ ์์ํ๋ NLP: ๋ฌธ์-๋จ์ RNN์ผ๋ก ์ด๋ฆ ๋ถ๋ฅํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="char_rnn_generation_tutorial.html">๊ธฐ์ด๋ถํฐ ์์ํ๋ NLP: ๋ฌธ์-๋จ์ RNN์ผ๋ก ์ด๋ฆ ์์ฑํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="seq2seq_translation_tutorial.html">๊ธฐ์ด๋ถํฐ ์์ํ๋ NLP: Sequence to Sequence ๋คํธ์ํฌ์ Attention์ ์ด์ฉํ ๋ฒ์ญ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/text_sentiment_ngrams_tutorial.html">torchtext ๋ผ์ด๋ธ๋ฌ๋ฆฌ๋ก ํ
์คํธ ๋ถ๋ฅํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/translation_transformer.html"><code class="docutils literal notranslate"><span class="pre">nn.Transformer</span></code> ์ torchtext๋ก ์ธ์ด ๋ฒ์ญํ๊ธฐ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">๊ฐํํ์ต</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="reinforcement_q_learning.html">๊ฐํ ํ์ต (DQN) ํํ ๋ฆฌ์ผ</a></li>
<li class="toctree-l1"><a class="reference internal" href="reinforcement_ppo.html">Reinforcement Learning (PPO) with TorchRL Tutorial</a></li>
<li class="toctree-l1"><a class="reference internal" href="mario_rl_tutorial.html">๋ง๋ฆฌ์ค ๊ฒ์ RL ์์ด์ ํธ๋ก ํ์ตํ๊ธฐ</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">PyTorch ๋ชจ๋ธ์ ํ๋ก๋์
ํ๊ฒฝ์ ๋ฐฐํฌํ๊ธฐ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="flask_rest_api_tutorial.html">Flask๋ฅผ ์ฌ์ฉํ์ฌ Python์์ PyTorch๋ฅผ REST API๋ก ๋ฐฐํฌํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/Intro_to_TorchScript_tutorial.html">TorchScript ์๊ฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/cpp_export.html">C++์์ TorchScript ๋ชจ๋ธ ๋ก๋ฉํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/super_resolution_with_onnxruntime.html">(์ ํ) PyTorch ๋ชจ๋ธ์ ONNX์ผ๋ก ๋ณํํ๊ณ ONNX ๋ฐํ์์์ ์คํํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="realtime_rpi.html">Raspberry Pi 4 ์์ ์ค์๊ฐ ์ถ๋ก (Inference) (30fps!)</a></li>
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<p class="caption" role="heading"><span class="caption-text">Code Transforms with FX</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="fx_conv_bn_fuser.html">(๋ฒ ํ) FX์์ ํฉ์ฑ๊ณฑ/๋ฐฐ์น ์ ๊ทํ(Convolution/Batch Norm) ๊ฒฐํฉ๊ธฐ(Fuser) ๋ง๋ค๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="fx_profiling_tutorial.html">(beta) Building a Simple CPU Performance Profiler with FX</a></li>
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<p class="caption" role="heading"><span class="caption-text">ํ๋ก ํธ์๋ API</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="memory_format_tutorial.html">(๋ฒ ํ) PyTorch๋ฅผ ์ฌ์ฉํ Channels Last ๋ฉ๋ชจ๋ฆฌ ํ์</a></li>
<li class="toctree-l1"><a class="reference internal" href="forward_ad_usage.html">Forward-mode Automatic Differentiation (Beta)</a></li>
<li class="toctree-l1"><a class="reference internal" href="jacobians_hessians.html">Jacobians, Hessians, hvp, vhp, and more: composing function transforms</a></li>
<li class="toctree-l1"><a class="reference internal" href="ensembling.html">๋ชจ๋ธ ์์๋ธ</a></li>
<li class="toctree-l1"><a class="reference internal" href="per_sample_grads.html">Per-sample-gradients</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/cpp_frontend.html">PyTorch C++ ํ๋ก ํธ์๋ ์ฌ์ฉํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/torch-script-parallelism.html">TorchScript์ ๋์ ๋ณ๋ ฌ ์ฒ๋ฆฌ(Dynamic Parallelism)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/cpp_autograd.html">C++ ํ๋ก ํธ์๋์ ์๋ ๋ฏธ๋ถ (autograd)</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">PyTorch ํ์ฅํ๊ธฐ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="custom_function_double_backward_tutorial.html">Double Backward with Custom Functions</a></li>
<li class="toctree-l1"><a class="reference internal" href="custom_function_conv_bn_tutorial.html">Fusing Convolution and Batch Norm using Custom Function</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/cpp_extension.html">Custom C++ and CUDA Extensions</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/torch_script_custom_ops.html">Extending TorchScript with Custom C++ Operators</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/torch_script_custom_classes.html">์ปค์คํ
C++ ํด๋์ค๋ก TorchScript ํ์ฅํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/dispatcher.html">Registering a Dispatched Operator in C++</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/extend_dispatcher.html">Extending dispatcher for a new backend in C++</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">๋ชจ๋ธ ์ต์ ํ</span></p>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../beginner/profiler.html">PyTorch ๋ชจ๋ ํ๋กํ์ผ๋ง ํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="tensorboard_profiler_tutorial.html">ํ
์๋ณด๋๋ฅผ ์ด์ฉํ ํ์ดํ ์น ํ๋กํ์ผ๋ฌ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/hyperparameter_tuning_tutorial.html">Ray Tune์ ์ด์ฉํ ํ์ดํผํ๋ผ๋ฏธํฐ ํ๋</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/vt_tutorial.html">๋ฐฐํฌ๋ฅผ ์ํ ๋น์ ํธ๋์คํฌ๋จธ(Vision Transformer) ๋ชจ๋ธ ์ต์ ํํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="parametrizations.html">Parametrizations Tutorial</a></li>
<li class="toctree-l1"><a class="reference internal" href="pruning_tutorial.html">๊ฐ์ง์น๊ธฐ ๊ธฐ๋ฒ(Pruning) ํํ ๋ฆฌ์ผ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/dynamic_quantization_tutorial.html">(๋ฒ ํ) LSTM ๊ธฐ๋ฐ ๋จ์ด ๋จ์ ์ธ์ด ๋ชจ๋ธ์ ๋์ ์์ํ</a></li>
<li class="toctree-l1"><a class="reference internal" href="dynamic_quantization_bert_tutorial.html">(๋ฒ ํ) BERT ๋ชจ๋ธ ๋์ ์์ํํ๊ธฐ</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">(๋ฒ ํ) ์ปดํจํฐ ๋น์ ํํ ๋ฆฌ์ผ์ ์ํ ์์ํ๋ ์ ์ดํ์ต(Quantized Transfer Learning)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/static_quantization_tutorial.html">(๋ฒ ํ) PyTorch์์ Eager Mode๋ฅผ ์ด์ฉํ ์ ์ ์์ํ</a></li>
<li class="toctree-l1"><a class="reference internal" href="torchserve_with_ipex.html">Grokking PyTorch Intel CPU performance from first principles</a></li>
<li class="toctree-l1"><a class="reference internal" href="torchserve_with_ipex_2.html">Grokking PyTorch Intel CPU performance from first principles (Part 2)</a></li>
<li class="toctree-l1"><a class="reference internal" href="nvfuser_intro_tutorial.html">Getting Started - Accelerate Your Scripts with nvFuser</a></li>
<li class="toctree-l1"><a class="reference internal" href="ax_multiobjective_nas_tutorial.html">Multi-Objective NAS with Ax</a></li>
<li class="toctree-l1"><a class="reference internal" href="torch_compile_tutorial.html">torch.compile Tutorial</a></li>
<li class="toctree-l1"><a class="reference internal" href="scaled_dot_product_attention_tutorial.html">(Beta) Scaled Dot Product Attention (SDPA)๋ก ๊ณ ์ฑ๋ฅ ํธ๋์คํฌ๋จธ(Transformers) ๊ตฌํํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="scaled_dot_product_attention_tutorial.html#torch-compile-sdpa"><code class="docutils literal notranslate"><span class="pre">torch.compile</span></code> ๊ณผ ํจ๊ป SDPA ์ฌ์ฉํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="scaled_dot_product_attention_tutorial.html#id6">๊ฒฐ๋ก </a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">๋ณ๋ ฌ ๋ฐ ๋ถ์ฐ ํ์ต</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../distributed/home.html">Distributed and Parallel Training Tutorials</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/dist_overview.html">PyTorch Distributed Overview</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/ddp_series_intro.html">Distributed Data Parallel in PyTorch - Video Tutorials</a></li>
<li class="toctree-l1"><a class="reference internal" href="model_parallel_tutorial.html">๋จ์ผ ๋จธ์ ์ ์ฌ์ฉํ ๋ชจ๋ธ ๋ณ๋ ฌํ ๋ชจ๋ฒ ์ฌ๋ก</a></li>
<li class="toctree-l1"><a class="reference internal" href="ddp_tutorial.html">๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ ์์ํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="dist_tuto.html">PyTorch๋ก ๋ถ์ฐ ์ดํ๋ฆฌ์ผ์ด์
๊ฐ๋ฐํ๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="FSDP_tutorial.html">Getting Started with Fully Sharded Data Parallel(FSDP)</a></li>
<li class="toctree-l1"><a class="reference internal" href="FSDP_adavnced_tutorial.html">Advanced Model Training with Fully Sharded Data Parallel (FSDP)</a></li>
<li class="toctree-l1"><a class="reference internal" href="process_group_cpp_extension_tutorial.html">Cpp ํ์ฅ์ ์ฌ์ฉํ์ฌ ํ๋ก์ธ์ค ๊ทธ๋ฃน ๋ฐฑ์๋ ์ฌ์ฉ์ ์ ์</a></li>
<li class="toctree-l1"><a class="reference internal" href="rpc_tutorial.html">Getting Started with Distributed RPC Framework</a></li>
<li class="toctree-l1"><a class="reference internal" href="rpc_param_server_tutorial.html">Implementing a Parameter Server Using Distributed RPC Framework</a></li>
<li class="toctree-l1"><a class="reference internal" href="dist_pipeline_parallel_tutorial.html">Distributed Pipeline Parallelism Using RPC</a></li>
<li class="toctree-l1"><a class="reference internal" href="rpc_async_execution.html">Implementing Batch RPC Processing Using Asynchronous Executions</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/rpc_ddp_tutorial.html">๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ(DDP)๊ณผ ๋ถ์ฐ RPC ํ๋ ์์ํฌ ๊ฒฐํฉ</a></li>
<li class="toctree-l1"><a class="reference internal" href="pipeline_tutorial.html">ํ์ดํ๋ผ์ธ ๋ณ๋ ฌํ๋ก ํธ๋์คํฌ๋จธ ๋ชจ๋ธ ํ์ต์ํค๊ธฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/ddp_pipeline.html">๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ์ ๋ณ๋ ฌ ์ฒ๋ฆฌ ํ์ดํ๋ผ์ธ์ ์ฌ์ฉํ ํธ๋์คํฌ๋จธ ๋ชจ๋ธ ํ์ต</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/generic_join.html">Distributed Training with Uneven Inputs Using the Join Context Manager</a></li>
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<p class="caption" role="heading"><span class="caption-text">๋ชจ๋ฐ์ผ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/deeplabv3_on_ios.html">iOS์์์ ์ด๋ฏธ์ง ๋ถํ DeepLapV3</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/deeplabv3_on_android.html">์๋๋ก์ด๋์์์ ์ด๋ฏธ์ง ๋ถํ DeepLapV3</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">์ถ์ฒ ์์คํ
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<ul>
<li class="toctree-l1"><a class="reference internal" href="torchrec_tutorial.html">TorchRec ์๊ฐ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/sharding.html">Exploring TorchRec sharding</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">Multimodality</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/flava_finetuning_tutorial.html">TorchMultimodal ํํ ๋ฆฌ์ผ: FLAVA ๋ฏธ์ธ์กฐ์ </a></li>
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<h1>(๋ฒ ํ) ์ปดํจํฐ ๋น์ ํํ ๋ฆฌ์ผ์ ์ํ ์์ํ๋ ์ ์ดํ์ต(Quantized Transfer Learning)<a class="headerlink" href="#quantized-transfer-learning" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h1>
<div class="admonition tip">
<p class="admonition-title">ํ</p>
<p>์ด ํํ ๋ฆฌ์ผ์ ์ต๋ํ ํ์ฉํ์๋ ค๋ฉด, ๋ค์์ ๋งํฌ๋ฅผ ์ด์ฉํ์๊ธธ ์ถ์ฒํฉ๋๋ค.
<a class="reference external" href="https://colab.research.google.com/github/pytorch/tutorials/blob/gh-pages/_downloads/quantized_transfer_learning_tutorial.ipynb">Colab ๋ฒ์ </a>.
์ด๋ฅผ ํตํด ์๋์ ์ ์๋ ์ ๋ณด๋ก ์คํ์ ํด ๋ณผ ์ ์์ต๋๋ค.</p>
</div>
<p><strong>Author</strong>: <a class="reference external" href="https://github.com/z-a-f">Zafar Takhirov</a>
<strong>Reviewed by</strong>: <a class="reference external" href="https://github.com/raghuramank100">Raghuraman Krishnamoorthi</a>
<strong>Edited by</strong>: <a class="reference external" href="https://github.com/jlin27">Jessica Lin</a>
<strong>๋ฒ์ญ</strong>: <a class="reference external" href="https://github.com/jjeamin">์ ์ฌ๋ฏผ</a></p>
<p>์ด ํํ ๋ฆฌ์ผ์ <a class="reference external" href="https://chsasank.github.io/">Sasank Chilamkurthy</a> ๊ฐ ์์ฑํ
<a class="reference internal" href="../beginner/transfer_learning_tutorial.html"><span class="doc">์ปดํจํฐ ๋น์ (Vision)์ ์ํ ์ ์ดํ์ต(Transfer Learning)</span></a> ์ ๊ธฐ๋ฐ์ผ๋ก ํฉ๋๋ค.</p>
<p>์ ์ดํ์ต(Transfer learning)์ ๋ค๋ฅธ ๋ฐ์ดํฐ์
์ ์ ์ฉํ๊ธฐ ์ํด์ ๋ฏธ๋ฆฌ ํ์ต๋ ๋ชจ๋ธ์ ์ฌ์ฉํ๋ ๊ธฐ์ ์ ๋งํฉ๋๋ค.
์ ์ดํ์ต์ ์ฌ์ฉํ๋ 2๊ฐ์ง ์ฃผ์ ๋ฐฉ๋ฒ์ด ์์ต๋๋ค.</p>
<ol class="arabic">
<li><p><strong>๊ณ ์ ๋ ํน์ง ์ถ์ถ๊ธฐ๋ก์จ ConvNet</strong>: ์ฌ๊ธฐ์๋ ๋ง์ง๋ง ๋ช๊ฐ์ ๊ณ์ธต(์ผ๋ช
โํค๋(the head)โ, ์ผ๋ฐ์ ์ผ๋ก ์์ ํ ์ฐ๊ฒฐ๋ ๊ณ์ธต)
์ ์ ์ธํ๊ณ ๋คํธ์ํฌ์ ๋ชจ๋ ๋งค๊ฐ ๋ณ์ ๊ฐ์ค์น๋ฅผ <a class="reference external" href="https://arxiv.org/abs/1706.04983">โ๊ณ ์ (freeze)โ</a> ํฉ๋๋ค.
๋ง์ง๋ง ๊ณ์ธต์ ์์์ ๊ฐ์ค์น๋ก ์ด๊ธฐํ๋ ์๋ก์ด ๊ณ์ธต์ผ๋ก ๋์ฒด๋๋ฉฐ ์ค์ง ์ด ๊ณ์ธต๋ง ํ์ต๋ฉ๋๋ค.</p></li>
<li><p><strong>ConvNet ๋ฏธ์ธ์กฐ์ (Finetuning)</strong>: ๋๋ค ์ด๊ธฐํ ๋์ , ๋ฏธ๋ฆฌ ํ์ต๋ ๋คํธ์ํฌ๋ฅผ ์ด์ฉํ์ฌ ๋ชจ๋ธ์ ์ด๊ธฐํํฉ๋๋ค.
์ดํ ํ์์ฒ๋ผ ํ์ต์ ์งํํ์ง๋ง ๋ค๋ฅธ ๋ฐ์ดํฐ์
์ ์ฌ์ฉํฉ๋๋ค.
ํ์์ฒ๋ผ ํ์ต์ด ์งํ๋์ง๋ง ๋ค๋ฅธ ๋ฐ์ดํฐ์
์ ์ฌ์ฉํฉ๋๋ค.</p>
<p>์ถ๋ ฅ์ ์๊ฐ ๋ค๋ฅผ ์ ์๊ธฐ ๋๋ฌธ์, ์ผ๋ฐ์ ์ผ๋ก ์ ๊ฒฝ๋ง์์ ํค๋(๋๋ ๊ทธ ์ผ๋ถ)๋ ๊ต์ฒด๋ฉ๋๋ค.
์ด ๋ฐฉ๋ฒ์์๋ ํ์ต๋ฅ ์ ๋ ์์ ์๋ก ์ค์ ํ๋ ๊ฒ์ด ์ผ๋ฐ์ ์
๋๋ค.
์ด๋ ๋คํธ์ํฌ๊ฐ ์ด๋ฏธ ํ์ต๋์๊ธฐ ๋๋ฌธ์ด๋ฉฐ ์๋ก์ด ๋ฐ์ดํฐ์
์ผ๋ก ใ๋ฏธ์ธ์กฐ์ (finetuning)ใํ๋ ค๋ฉด ์ฝ๊ฐ์ ๋ณ๊ฒฝ๋ง์ด ํ์ํฉ๋๋ค.</p>
</li>
</ol>
<p>๋ํ ์์ ๋ ๋ฐฉ๋ฒ์ ๊ฒฐํฉํ ์๋ ์์ต๋๋ค.
๋จผ์ ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ๊ณ ์ (freeze)ํ๊ณ ํค๋(the head)๋ฅผ ํ์ต์ํต๋๋ค.
๊ทธ๋ฐ ๋ค์ ํน์ง ์ถ์ถ๊ธฐ(๋๋ ๊ทธ ์ผ๋ถ)๋ฅผ ๊ณ ์ ํด์ (unfreeze)ํ๊ณ ํ์ต๋ฅ ์
๋ ์์ ์๋ก ์ค์ ํ ๋ค์ ํ์ต์ ๊ณ์ํ ์ ์์ต๋๋ค.</p>
<p>์ด๋ฒ ํํธ์์๋ ์ฒซ๋ฒ์งธ ๋ฐฉ๋ฒ์ ์ฌ์ฉํด ์์ํ๋ ๋ชจ๋ธ๋ก ํน์ง์ ์ถ์ถํด๋ด
์๋ค.</p>
<div class="section" id="id2">
<h2>ํํธ 0. ์๊ตฌ์ฌํญ<a class="headerlink" href="#id2" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h2>
<p>์ ์ด ํ์ต(transfer learning)์ ์์ํ๊ธฐ ์ ์,
๋ฐ์ดํฐ ๋ถ๋ฌ์ค๊ธฐ / ์๊ฐํ์ ๊ฐ์ ใ์๊ตฌ์ฌํญ(prerequisites)ใ์ ๊ฒํ ํ๊ฒ ์ต๋๋ค.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Imports</span>
<span class="kn">import</span> <span class="nn">copy</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ion</span><span class="p">()</span>
</pre></div>
</div>
<div class="section" id="nightly-build">
<h3>Nightly Build ์ค์นํ๊ธฐ<a class="headerlink" href="#nightly-build" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<p>PyTorch์ ๋ฒ ํ(beta)๋ฅผ ์ฌ์ฉํ ๊ฒ์ด๋ฏ๋ก ์ต์ ๋ฒ์ ์ <code class="docutils literal notranslate"><span class="pre">torch</span></code> ์ <code class="docutils literal notranslate"><span class="pre">torchvision</span></code> ์ ์ค์นํ๋ ๊ฒ์ ๊ถ์ฅํฉ๋๋ค.
๋ก์ปฌ(local) ์ค์น์ ๋ํ ์ต์ ์ง์นจ์ <a class="reference external" href="https://pytorch.org/get-started/locally/">์ฌ๊ธฐ</a> ์์ ์ฐพ์ ์ ์์ต๋๋ค.
์๋ฅผ ๋ค์ด GPU ์ง์ ์์ด ์ค์นํ๋ ค๋ฉด :</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>numpy
pip<span class="w"> </span>install<span class="w"> </span>--pre<span class="w"> </span>torch<span class="w"> </span>torchvision<span class="w"> </span>-f<span class="w"> </span>https://download.pytorch.org/whl/nightly/cpu/torch_nightly.html
<span class="c1"># CUDA ์ง์์ https://download.pytorch.org/whl/nightly/cu101/torch_nightly.html๋ฅผ ์ฌ์ฉํ์ธ์.</span>
</pre></div>
</div>
</div>
<div class="section" id="id4">
<h3>๋ฐ์ดํฐ ๋ถ๋ฌ์ค๊ธฐ<a class="headerlink" href="#id4" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<div class="admonition note">
<p class="admonition-title">์ฐธ๊ณ </p>
<p>์ด๋ฒ ์น์
์ ์๋ณธ ์ ์ดํ์ต(Transfer Learning) ํํ ๋ฆฌ์ผ๊ณผ ๋์ผํฉ๋๋ค.</p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">torchvision</span></code> ๊ณผ <code class="docutils literal notranslate"><span class="pre">torch.utils.data</span></code> ํจํค์ง๋ฅผ ์ฌ์ฉํ์ฌ ๋ฐ์ดํฐ๋ฅผ ๋ถ๋ฌ์ต๋๋ค.</p>
<p>์ฌ๊ธฐ์ ํ๊ณ ์ ํ๋ ๋ฌธ์ ๋ ์ด๋ฏธ์ง๋ก๋ถํฐ <strong>๊ฐ๋ฏธ</strong> ์ <strong>๋ฒ</strong> ์ ๋ถ๋ฅํ๋ ๊ฒ์
๋๋ค.
์ด ๋ฐ์ดํฐ์
์ ๊ฐ๋ฏธ์ ๋ฒ์ ๋ํด ๊ฐ๊ฐ 120์ฅ์ ํ์ต์ฉ ์ด๋ฏธ์ง, 75๊ฐ์ ๊ฒ์ฆ์ฉ ์ด๋ฏธ์ง๋ฅผ ํฌํจํฉ๋๋ค.
์ด๋ ์ผ๋ฐํํ๊ธฐ์๋ ์์ฃผ ์์ ๋ฐ์ดํฐ์
์
๋๋ค.
ํ์ง๋ง ์ฐ๋ฆฌ๋ ์ ์ดํ์ต(Transfer Learning)์ ์ฌ์ฉํ๊ธฐ ๋๋ฌธ์, ์ผ๋ฐํ๋ฅผ ๊ฝค ์ ํ ์ ์์ ๊ฒ์
๋๋ค.</p>
<p>์ด ๋ฐ์ดํฐ์
์ imagenet์ ์์ฃผ ์์ ์ผ๋ถ์
๋๋ค.</p>
<div class="admonition note">
<p class="admonition-title">์ฐธ๊ณ </p>
<p><a class="reference external" href="https://download.pytorch.org/tutorial/hymenoptera_data.zip">์ฌ๊ธฐ</a> ์์ ๋ฐ์ดํฐ๋ฅผ ๋ค์ด๋ก๋ ๋ฐ์ <code class="docutils literal notranslate"><span class="pre">data</span></code> ๋๋ ํ ๋ฆฌ์ ์์ถ์ ํธ์ธ์.</p>
</div>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">from</span> <span class="nn">torchvision</span> <span class="kn">import</span> <span class="n">transforms</span><span class="p">,</span> <span class="n">datasets</span>
<span class="c1"># ํ์ต์ ์ํ ๋ฐ์ดํฐ ๋ณด๊ฐ(Data augmentation)๊ณผ ์ ๊ทํ</span>
<span class="c1"># ๊ฒ์ฆ์ ์ํ ์ ๊ทํ</span>
<span class="n">data_transforms</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">'train'</span><span class="p">:</span> <span class="n">transforms</span><span class="o">.</span><span class="n">Compose</span><span class="p">([</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">Resize</span><span class="p">(</span><span class="mi">224</span><span class="p">),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">RandomCrop</span><span class="p">(</span><span class="mi">224</span><span class="p">),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">RandomHorizontalFlip</span><span class="p">(),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">ToTensor</span><span class="p">(),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">Normalize</span><span class="p">([</span><span class="mf">0.485</span><span class="p">,</span> <span class="mf">0.456</span><span class="p">,</span> <span class="mf">0.406</span><span class="p">],</span> <span class="p">[</span><span class="mf">0.229</span><span class="p">,</span> <span class="mf">0.224</span><span class="p">,</span> <span class="mf">0.225</span><span class="p">])</span>
<span class="p">]),</span>
<span class="s1">'val'</span><span class="p">:</span> <span class="n">transforms</span><span class="o">.</span><span class="n">Compose</span><span class="p">([</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">Resize</span><span class="p">(</span><span class="mi">224</span><span class="p">),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">CenterCrop</span><span class="p">(</span><span class="mi">224</span><span class="p">),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">ToTensor</span><span class="p">(),</span>
<span class="n">transforms</span><span class="o">.</span><span class="n">Normalize</span><span class="p">([</span><span class="mf">0.485</span><span class="p">,</span> <span class="mf">0.456</span><span class="p">,</span> <span class="mf">0.406</span><span class="p">],</span> <span class="p">[</span><span class="mf">0.229</span><span class="p">,</span> <span class="mf">0.224</span><span class="p">,</span> <span class="mf">0.225</span><span class="p">])</span>
<span class="p">]),</span>
<span class="p">}</span>
<span class="n">data_dir</span> <span class="o">=</span> <span class="s1">'data/hymenoptera_data'</span>
<span class="n">image_datasets</span> <span class="o">=</span> <span class="p">{</span><span class="n">x</span><span class="p">:</span> <span class="n">datasets</span><span class="o">.</span><span class="n">ImageFolder</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">data_dir</span><span class="p">,</span> <span class="n">x</span><span class="p">),</span>
<span class="n">data_transforms</span><span class="p">[</span><span class="n">x</span><span class="p">])</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'train'</span><span class="p">,</span> <span class="s1">'val'</span><span class="p">]}</span>
<span class="n">dataloaders</span> <span class="o">=</span> <span class="p">{</span><span class="n">x</span><span class="p">:</span> <span class="n">torch</span><span class="o">.</span><span class="n">utils</span><span class="o">.</span><span class="n">data</span><span class="o">.</span><span class="n">DataLoader</span><span class="p">(</span><span class="n">image_datasets</span><span class="p">[</span><span class="n">x</span><span class="p">],</span> <span class="n">batch_size</span><span class="o">=</span><span class="mi">16</span><span class="p">,</span>
<span class="n">shuffle</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">num_workers</span><span class="o">=</span><span class="mi">8</span><span class="p">)</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'train'</span><span class="p">,</span> <span class="s1">'val'</span><span class="p">]}</span>
<span class="n">dataset_sizes</span> <span class="o">=</span> <span class="p">{</span><span class="n">x</span><span class="p">:</span> <span class="nb">len</span><span class="p">(</span><span class="n">image_datasets</span><span class="p">[</span><span class="n">x</span><span class="p">])</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'train'</span><span class="p">,</span> <span class="s1">'val'</span><span class="p">]}</span>
<span class="n">class_names</span> <span class="o">=</span> <span class="n">image_datasets</span><span class="p">[</span><span class="s1">'train'</span><span class="p">]</span><span class="o">.</span><span class="n">classes</span>
<span class="n">device</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">device</span><span class="p">(</span><span class="s2">"cuda:0"</span> <span class="k">if</span> <span class="n">torch</span><span class="o">.</span><span class="n">cuda</span><span class="o">.</span><span class="n">is_available</span><span class="p">()</span> <span class="k">else</span> <span class="s2">"cpu"</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="id6">
<h3>์ผ๋ถ ์ด๋ฏธ์ง ์๊ฐํํ๊ธฐ<a class="headerlink" href="#id6" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<p>๋ฐ์ดํฐ ๋ณด๊ฐ์ ์ดํดํ๊ธฐ ์ํด ์ผ๋ถ ํ์ต์ฉ ์ด๋ฏธ์ง๋ฅผ ์๊ฐํ ํด๋ณด๊ฒ ์ต๋๋ค.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">torchvision</span>
<span class="k">def</span> <span class="nf">imshow</span><span class="p">(</span><span class="n">inp</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">ax</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="mi">5</span><span class="p">)):</span>
<span class="w"> </span><span class="sd">"""Imshow for Tensor."""</span>
<span class="n">inp</span> <span class="o">=</span> <span class="n">inp</span><span class="o">.</span><span class="n">numpy</span><span class="p">()</span><span class="o">.</span><span class="n">transpose</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span>
<span class="n">mean</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">0.485</span><span class="p">,</span> <span class="mf">0.456</span><span class="p">,</span> <span class="mf">0.406</span><span class="p">])</span>
<span class="n">std</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">0.229</span><span class="p">,</span> <span class="mf">0.224</span><span class="p">,</span> <span class="mf">0.225</span><span class="p">])</span>
<span class="n">inp</span> <span class="o">=</span> <span class="n">std</span> <span class="o">*</span> <span class="n">inp</span> <span class="o">+</span> <span class="n">mean</span>
<span class="n">inp</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">clip</span><span class="p">(</span><span class="n">inp</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">ax</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">figsize</span><span class="o">=</span><span class="n">figsize</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">inp</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xticks</span><span class="p">([])</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_yticks</span><span class="p">([])</span>
<span class="k">if</span> <span class="n">title</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="n">title</span><span class="p">)</span>
<span class="c1"># ํ์ต ๋ฐ์ดํฐ์ ๋ฐฐ์น๋ฅผ ์ป์ต๋๋ค.</span>
<span class="n">inputs</span><span class="p">,</span> <span class="n">classes</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="nb">iter</span><span class="p">(</span><span class="n">dataloaders</span><span class="p">[</span><span class="s1">'train'</span><span class="p">]))</span>
<span class="c1"># ๋ฐฐ์น๋ก๋ถํฐ ๊ฒฉ์ ํํ์ ์ด๋ฏธ์ง๋ฅผ ๋ง๋ญ๋๋ค.</span>
<span class="n">out</span> <span class="o">=</span> <span class="n">torchvision</span><span class="o">.</span><span class="n">utils</span><span class="o">.</span><span class="n">make_grid</span><span class="p">(</span><span class="n">inputs</span><span class="p">,</span> <span class="n">nrow</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span>
<span class="n">imshow</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="p">[</span><span class="n">class_names</span><span class="p">[</span><span class="n">x</span><span class="p">]</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">classes</span><span class="p">],</span> <span class="n">ax</span><span class="o">=</span><span class="n">ax</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="id7">
<h3>๋ชจ๋ธ ํ์ต์ ์ํ ์ง์ ํจ์<a class="headerlink" href="#id7" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<p>๋ค์์ ๋ชจ๋ธ์ ํ์ตํ๊ธฐ ์ํ ์ผ๋ฐ ํจ์ ์
๋๋ค.</p>
<ul class="simple">
<li><p>ํ์ต๋ฅ (learning rate)์ ๊ด๋ฆฌํฉ๋๋ค(schedules).</p></li>
<li><p>์ต์ ์ ๋ชจ๋ธ์ ์ ์ฅํฉ๋๋ค.</p></li>
</ul>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">train_model</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">criterion</span><span class="p">,</span> <span class="n">optimizer</span><span class="p">,</span> <span class="n">scheduler</span><span class="p">,</span> <span class="n">num_epochs</span><span class="o">=</span><span class="mi">25</span><span class="p">,</span> <span class="n">device</span><span class="o">=</span><span class="s1">'cpu'</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""</span>
<span class="sd"> Support function for model training.</span>
<span class="sd"> ๋ชจ๋ธ ํ์ต์ ์ํ ์ง์ ํจ์</span>
<span class="sd"> ๋งค๊ฐ๋ณ์:</span>
<span class="sd"> model: ํ์ตํ ๋ชจ๋ธ</span>
<span class="sd"> criterion: ์ต์ ํ ๊ธฐ์ค(์์ค)</span>
<span class="sd"> optimizer: ํ์ต์ ์ฌ์ฉํ ์ตํฐ๋ง์ด์ </span>
<span class="sd"> scheduler: ``torch.optim.lr_scheduler`` ์ ์ธ์คํด์ค</span>
<span class="sd"> num_epochs: ์ํญ์ ์</span>
<span class="sd"> device: ํ์ต์ ๋์์ํฌ ์ฅ์น. 'cpu' ๋๋ 'cuda'์ฌ์ผ ํฉ๋๋ค.</span>
<span class="sd"> """</span>
<span class="n">since</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
<span class="n">best_model_wts</span> <span class="o">=</span> <span class="n">copy</span><span class="o">.</span><span class="n">deepcopy</span><span class="p">(</span><span class="n">model</span><span class="o">.</span><span class="n">state_dict</span><span class="p">())</span>
<span class="n">best_acc</span> <span class="o">=</span> <span class="mf">0.0</span>
<span class="k">for</span> <span class="n">epoch</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">num_epochs</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Epoch </span><span class="si">{}</span><span class="s1">/</span><span class="si">{}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">epoch</span><span class="p">,</span> <span class="n">num_epochs</span> <span class="o">-</span> <span class="mi">1</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'-'</span> <span class="o">*</span> <span class="mi">10</span><span class="p">)</span>
<span class="c1"># ๊ฐ ์ํญ์๋ ํ์ต ๋ฐ ๊ฒ์ฆ ๋จ๊ณ๊ฐ ์์ต๋๋ค.</span>
<span class="k">for</span> <span class="n">phase</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'train'</span><span class="p">,</span> <span class="s1">'val'</span><span class="p">]:</span>
<span class="k">if</span> <span class="n">phase</span> <span class="o">==</span> <span class="s1">'train'</span><span class="p">:</span>
<span class="n">model</span><span class="o">.</span><span class="n">train</span><span class="p">()</span> <span class="c1"># ๋ชจ๋ธ์ ํ์ต ๋ชจ๋๋ก ์ค์ ํ๊ธฐ</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">model</span><span class="o">.</span><span class="n">eval</span><span class="p">()</span> <span class="c1"># ๋ชจ๋ธ์ ํ๊ฐ ๋ชจ๋๋ก ์ค์ ํ๊ธฐ</span>
<span class="n">running_loss</span> <span class="o">=</span> <span class="mf">0.0</span>
<span class="n">running_corrects</span> <span class="o">=</span> <span class="mi">0</span>
<span class="c1"># ๋ฐ์ดํฐ ๋ฐ๋ณตํ๊ธฐ</span>
<span class="k">for</span> <span class="n">inputs</span><span class="p">,</span> <span class="n">labels</span> <span class="ow">in</span> <span class="n">dataloaders</span><span class="p">[</span><span class="n">phase</span><span class="p">]:</span>
<span class="n">inputs</span> <span class="o">=</span> <span class="n">inputs</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">)</span>
<span class="n">labels</span> <span class="o">=</span> <span class="n">labels</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">)</span>
<span class="c1"># ๋งค๊ฐ ๋ณ์ ๊ธฐ์ธ๊ธฐ๋ฅผ 0์ผ๋ก ์ค์ ํ๊ธฐ</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">zero_grad</span><span class="p">()</span>
<span class="c1"># ์์ ํ</span>
<span class="c1"># ํ์ต ๋์๋ง ์ฐ์ฐ ๊ธฐ๋ก์ ์ถ์ ํ๊ธฐ</span>
<span class="k">with</span> <span class="n">torch</span><span class="o">.</span><span class="n">set_grad_enabled</span><span class="p">(</span><span class="n">phase</span> <span class="o">==</span> <span class="s1">'train'</span><span class="p">):</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="n">model</span><span class="p">(</span><span class="n">inputs</span><span class="p">)</span>
<span class="n">_</span><span class="p">,</span> <span class="n">preds</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">max</span><span class="p">(</span><span class="n">outputs</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">loss</span> <span class="o">=</span> <span class="n">criterion</span><span class="p">(</span><span class="n">outputs</span><span class="p">,</span> <span class="n">labels</span><span class="p">)</span>
<span class="c1"># ์ญ์ ํ + ํ์ต ๋จ๊ณ์์๋ง ์ต์ ํ</span>
<span class="k">if</span> <span class="n">phase</span> <span class="o">==</span> <span class="s1">'train'</span><span class="p">:</span>
<span class="n">loss</span><span class="o">.</span><span class="n">backward</span><span class="p">()</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">step</span><span class="p">()</span>
<span class="c1"># ํต๊ณ ๋ณด๊ธฐ</span>
<span class="n">running_loss</span> <span class="o">+=</span> <span class="n">loss</span><span class="o">.</span><span class="n">item</span><span class="p">()</span> <span class="o">*</span> <span class="n">inputs</span><span class="o">.</span><span class="n">size</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">running_corrects</span> <span class="o">+=</span> <span class="n">torch</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">preds</span> <span class="o">==</span> <span class="n">labels</span><span class="o">.</span><span class="n">data</span><span class="p">)</span>
<span class="k">if</span> <span class="n">phase</span> <span class="o">==</span> <span class="s1">'train'</span><span class="p">:</span>
<span class="n">scheduler</span><span class="o">.</span><span class="n">step</span><span class="p">()</span>
<span class="n">epoch_loss</span> <span class="o">=</span> <span class="n">running_loss</span> <span class="o">/</span> <span class="n">dataset_sizes</span><span class="p">[</span><span class="n">phase</span><span class="p">]</span>
<span class="n">epoch_acc</span> <span class="o">=</span> <span class="n">running_corrects</span><span class="o">.</span><span class="n">double</span><span class="p">()</span> <span class="o">/</span> <span class="n">dataset_sizes</span><span class="p">[</span><span class="n">phase</span><span class="p">]</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'</span><span class="si">{}</span><span class="s1"> Loss: </span><span class="si">{:.4f}</span><span class="s1"> Acc: </span><span class="si">{:.4f}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">phase</span><span class="p">,</span> <span class="n">epoch_loss</span><span class="p">,</span> <span class="n">epoch_acc</span><span class="p">))</span>
<span class="c1"># ๋ชจ๋ธ ๋ณต์ฌํ๊ธฐ</span>
<span class="k">if</span> <span class="n">phase</span> <span class="o">==</span> <span class="s1">'val'</span> <span class="ow">and</span> <span class="n">epoch_acc</span> <span class="o">></span> <span class="n">best_acc</span><span class="p">:</span>
<span class="n">best_acc</span> <span class="o">=</span> <span class="n">epoch_acc</span>
<span class="n">best_model_wts</span> <span class="o">=</span> <span class="n">copy</span><span class="o">.</span><span class="n">deepcopy</span><span class="p">(</span><span class="n">model</span><span class="o">.</span><span class="n">state_dict</span><span class="p">())</span>
<span class="nb">print</span><span class="p">()</span>
<span class="n">time_elapsed</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">-</span> <span class="n">since</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Training complete in </span><span class="si">{:.0f}</span><span class="s1">m </span><span class="si">{:.0f}</span><span class="s1">s'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">time_elapsed</span> <span class="o">//</span> <span class="mi">60</span><span class="p">,</span> <span class="n">time_elapsed</span> <span class="o">%</span> <span class="mi">60</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Best val Acc: </span><span class="si">{:4f}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">best_acc</span><span class="p">))</span>
<span class="c1"># ์ต์ ์ ๋ชจ๋ธ ๊ฐ์ค์น ๋ถ๋ฌ์ค๊ธฐ</span>
<span class="n">model</span><span class="o">.</span><span class="n">load_state_dict</span><span class="p">(</span><span class="n">best_model_wts</span><span class="p">)</span>
<span class="k">return</span> <span class="n">model</span>
</pre></div>
</div>
</div>
<div class="section" id="id8">
<h3>๋ชจ๋ธ ์์ธก์ ์๊ฐํํ๊ธฐ ์ํ ์ง์ ํจ์<a class="headerlink" href="#id8" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<p>์ผ๋ถ ์ด๋ฏธ์ง์ ๋ํ ์์ธก์ ์ถ๋ ฅํ๋ ์ผ๋ฐ ํจ์</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">visualize_model</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">rows</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">cols</span><span class="o">=</span><span class="mi">3</span><span class="p">):</span>
<span class="n">was_training</span> <span class="o">=</span> <span class="n">model</span><span class="o">.</span><span class="n">training</span>
<span class="n">model</span><span class="o">.</span><span class="n">eval</span><span class="p">()</span>
<span class="n">current_row</span> <span class="o">=</span> <span class="n">current_col</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">(</span><span class="n">rows</span><span class="p">,</span> <span class="n">cols</span><span class="p">,</span> <span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="n">cols</span><span class="o">*</span><span class="mi">2</span><span class="p">,</span> <span class="n">rows</span><span class="o">*</span><span class="mi">2</span><span class="p">))</span>
<span class="k">with</span> <span class="n">torch</span><span class="o">.</span><span class="n">no_grad</span><span class="p">():</span>
<span class="k">for</span> <span class="n">idx</span><span class="p">,</span> <span class="p">(</span><span class="n">imgs</span><span class="p">,</span> <span class="n">lbls</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">dataloaders</span><span class="p">[</span><span class="s1">'val'</span><span class="p">]):</span>
<span class="n">imgs</span> <span class="o">=</span> <span class="n">imgs</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span>
<span class="n">lbls</span> <span class="o">=</span> <span class="n">lbls</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="n">model</span><span class="p">(</span><span class="n">imgs</span><span class="p">)</span>
<span class="n">_</span><span class="p">,</span> <span class="n">preds</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">max</span><span class="p">(</span><span class="n">outputs</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">for</span> <span class="n">jdx</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">imgs</span><span class="o">.</span><span class="n">size</span><span class="p">()[</span><span class="mi">0</span><span class="p">]):</span>
<span class="n">imshow</span><span class="p">(</span><span class="n">imgs</span><span class="o">.</span><span class="n">data</span><span class="p">[</span><span class="n">jdx</span><span class="p">],</span> <span class="n">ax</span><span class="o">=</span><span class="n">ax</span><span class="p">[</span><span class="n">current_row</span><span class="p">,</span> <span class="n">current_col</span><span class="p">])</span>
<span class="n">ax</span><span class="p">[</span><span class="n">current_row</span><span class="p">,</span> <span class="n">current_col</span><span class="p">]</span><span class="o">.</span><span class="n">axis</span><span class="p">(</span><span class="s1">'off'</span><span class="p">)</span>
<span class="n">ax</span><span class="p">[</span><span class="n">current_row</span><span class="p">,</span> <span class="n">current_col</span><span class="p">]</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="s1">'predicted: </span><span class="si">{}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">class_names</span><span class="p">[</span><span class="n">preds</span><span class="p">[</span><span class="n">jdx</span><span class="p">]]))</span>
<span class="n">current_col</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="n">current_col</span> <span class="o">>=</span> <span class="n">cols</span><span class="p">:</span>
<span class="n">current_row</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="n">current_col</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">if</span> <span class="n">current_row</span> <span class="o">>=</span> <span class="n">rows</span><span class="p">:</span>
<span class="n">model</span><span class="o">.</span><span class="n">train</span><span class="p">(</span><span class="n">mode</span><span class="o">=</span><span class="n">was_training</span><span class="p">)</span>
<span class="k">return</span>
<span class="n">model</span><span class="o">.</span><span class="n">train</span><span class="p">(</span><span class="n">mode</span><span class="o">=</span><span class="n">was_training</span><span class="p">)</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="quantized-feature-extractor">
<h2>ํํธ 1. ์์ํ๋ ํน์ง ์ถ์ถ๊ธฐ(Quantized Feature Extractor)๋ฅผ ๊ธฐ๋ฐ์ผ๋ก ์ฌ์ฉ์ ์ง์ ๋ถ๋ฅ๊ธฐ ํ๋ จํ๊ธฐ<a class="headerlink" href="#quantized-feature-extractor" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h2>
<p>์ด๋ฒ ์น์
์์๋ โ๊ณ ์ ๋(frozen)โ ์์ํ ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ์ฌ์ฉํ๊ณ ๊ทธ ์์ ์ฌ์ฉ์ ์ง์ ๋ถ๋ฅ๊ธฐ ํค๋๋ฅผ
ํ์ตํฉ๋๋ค. ๋ถ๋ ์์์ ๋ชจ๋ธ๊ณผ ๋ค๋ฅด๊ฒ ์์ํ๋ ๋ชจ๋ธ์๋ ํ์ต ๊ฐ๋ฅํ ๋งค๊ฐ ๋ณ์๊ฐ ์์ผ๋ฏ๋ก
requires_grad = False๋ฅผ ์ค์ ํ ํ์๊ฐ ์์ต๋๋ค. ์์ธํ ๋ด์ฉ์ <a class="reference external" href="https://pytorch.org/docs/stable/quantization.html">์ค๋ช
์</a> ๋ฅผ ์ฐธ์กฐํ์ธ์.</p>
<p>๋ฏธ๋ฆฌ ํ์ต๋ ๋ชจ๋ธ์ ๋ถ๋ฌ์ต๋๋ค: ์ด๋ฒ ์์ ์์๋ <a class="reference external" href="https://pytorch.org/hub/pytorch_vision_resnet/">ResNet-18</a> ์ ์ฌ์ฉํ ๊ฒ์
๋๋ค.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">torchvision.models.quantization</span> <span class="k">as</span> <span class="nn">models</span>
<span class="c1"># ๋์ค์ ์ฌ์ฉํ ์ ์๊ฒ `fc` ์ ํํฐ์ ์๊ฐ ํ์ํฉ๋๋ค.</span>
<span class="c1"># ์ฌ๊ธฐ์ ๊ฐ ์ถ๋ ฅ ์ํ์ ํฌ๊ธฐ๋ 2๋ก ์ค์ ํฉ๋๋ค.</span>
<span class="c1"># ๋ํ, nn.Linear(num_ftrs, len(class_names))๋ก ์ผ๋ฐํ ํ ์ ์์ต๋๋ค.</span>
<span class="n">model_fe</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">resnet18</span><span class="p">(</span><span class="n">pretrained</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">progress</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">quantize</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">num_ftrs</span> <span class="o">=</span> <span class="n">model_fe</span><span class="o">.</span><span class="n">fc</span><span class="o">.</span><span class="n">in_features</span>
</pre></div>
</div>
<p>์ด ์์ ์์ ๋ฏธ๋ฆฌ ํ์ต๋ ๋ชจ๋ธ์ ์์ ํด์ผ ํฉ๋๋ค. ๋ชจ๋ธ์ ์์๊ณผ ๋์๋ ์์ํ/์ญ์์ํ ๋ธ๋ก์ด ์์ต๋๋ค.
๊ทธ๋ฌ๋ ํน์ง ์ถ์ถ๊ธฐ๋ง ์ฌ์ฉํ๊ธฐ ๋๋ฌธ์ ์ญ์์ํ(dequantization) ๊ณ์ธต์ ์ ํ ๊ณ์ธต(ํค๋) ๋ฐ๋ก ์ ์ผ๋ก ์ด๋์์ผ์ผ ํฉ๋๋ค.
๊ฐ์ฅ ์ฌ์ด ๋ฐฉ๋ฒ์ ๋ชจ๋ธ์ <code class="docutils literal notranslate"><span class="pre">nn.Sequential</span></code> ๋ชจ๋๋ก ๊ฐ์ธ๋ ๊ฒ์
๋๋ค.</p>
<p>์ฒซ๋ฒ์งธ ๋จ๊ณ๋ ResNet ๋ชจ๋ธ์์ ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ๋ถ๋ฆฌํ๋ ๊ฒ์
๋๋ค.
์ด ์์ ์์๋ <code class="docutils literal notranslate"><span class="pre">fc</span></code> ๋ฅผ ์ ์ธํ ๋ชจ๋ ๊ณ์ธต์ ํน์ง ์ถ์ถ๊ธฐ๋ก ์ฌ์ฉํด์ผ ํ์ง๋ง, ์ค์ ๋ก๋ ํ์ํ ๋งํผ ๋ง์ ๋ถ๋ถ์ ์ฌ์ฉํ ์ ์์ต๋๋ค.
์ด๊ฒ์ ํฉ์ฑ๊ณฑ ๊ณ์ธต ์ค ์ผ๋ถ๋ฅผ ๊ต์ฒดํ๋ ค๋ ๊ฒฝ์ฐ์๋ ์ ์ฉํฉ๋๋ค.</p>
<div class="admonition note">
<p class="admonition-title">์ฐธ๊ณ </p>
<p>์์ํ ๋ชจ๋ธ์์ ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ๋ถ๋ฆฌํ ๋ ์์ํ๋ฅผ ์ ์งํ๋ ค๋ ๋ถ๋ถ์ ์์๊ณผ ๋์ ์๋์ผ๋ก ์์ํ/์ญ์์ํ๋ฅผ ๋ฐฐ์นํด์ผ ํฉ๋๋ค.</p>
</div>
<p>์๋ ํจ์๋ ์ฌ์ฉ์ ์ง์ ํค๋๋ก ๋ชจ๋ธ์ ์์ฑํ๋ ํจ์์
๋๋ค.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">torch</span> <span class="kn">import</span> <span class="n">nn</span>
<span class="k">def</span> <span class="nf">create_combined_model</span><span class="p">(</span><span class="n">model_fe</span><span class="p">):</span>
<span class="c1"># 1 ๋จ๊ณ. ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ๋ถ๋ฆฌํฉ๋๋ค.</span>
<span class="n">model_fe_features</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Sequential</span><span class="p">(</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">quant</span><span class="p">,</span> <span class="c1"># Quantize the input</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">conv1</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">bn1</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">relu</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">maxpool</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">layer1</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">layer2</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">layer3</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">layer4</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">avgpool</span><span class="p">,</span>
<span class="n">model_fe</span><span class="o">.</span><span class="n">dequant</span><span class="p">,</span> <span class="c1"># ์ถ๋ ฅ์ ์ญ์์ํํ๊ธฐ</span>
<span class="p">)</span>
<span class="c1"># 2 ๋จ๊ณ. ์๋ก์ด "ํค๋(head)"๋ฅผ ๋ง๋ญ๋๋ค.</span>
<span class="n">new_head</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Sequential</span><span class="p">(</span>
<span class="n">nn</span><span class="o">.</span><span class="n">Dropout</span><span class="p">(</span><span class="n">p</span><span class="o">=</span><span class="mf">0.5</span><span class="p">),</span>
<span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="n">num_ftrs</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span>
<span class="p">)</span>
<span class="c1"># 3 ๋จ๊ณ. ๊ฒฐํฉํ๊ณ ์์ ์คํ
(stubs)์ ์์ผ๋ฉด ์๋ฉ๋๋ค.</span>
<span class="n">new_model</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Sequential</span><span class="p">(</span>
<span class="n">model_fe_features</span><span class="p">,</span>
<span class="n">nn</span><span class="o">.</span><span class="n">Flatten</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span>
<span class="n">new_head</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">return</span> <span class="n">new_model</span>
</pre></div>
</div>
<div class="admonition warning">
<p class="admonition-title">๊ฒฝ๊ณ </p>
<p>ํ์ฌ ์์ํ๋ ๋ชจ๋ธ์ CPU์์๋ง ์คํํ ์ ์์ต๋๋ค.
๊ทธ๋ฌ๋ ๋ชจ๋ธ์ ์์ํ ๋์ง ์์ ๋ถ๋ถ์ GPU๋ก ๋ณด๋ผ ์ ์์ต๋๋ค.</p>
</div>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">torch.optim</span> <span class="k">as</span> <span class="nn">optim</span>
<span class="n">new_model</span> <span class="o">=</span> <span class="n">create_combined_model</span><span class="p">(</span><span class="n">model_fe</span><span class="p">)</span>
<span class="n">new_model</span> <span class="o">=</span> <span class="n">new_model</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="s1">'cpu'</span><span class="p">)</span>
<span class="n">criterion</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">CrossEntropyLoss</span><span class="p">()</span>
<span class="c1"># ํค๋(the head)๋ง ํ๋ จ ํ๋ค๋ ์ ์ ์ ์ํ์ธ์</span>
<span class="n">optimizer_ft</span> <span class="o">=</span> <span class="n">optim</span><span class="o">.</span><span class="n">SGD</span><span class="p">(</span><span class="n">new_model</span><span class="o">.</span><span class="n">parameters</span><span class="p">(),</span> <span class="n">lr</span><span class="o">=</span><span class="mf">0.01</span><span class="p">,</span> <span class="n">momentum</span><span class="o">=</span><span class="mf">0.9</span><span class="p">)</span>
<span class="c1"># 7 ์ํญ๋ง๋ค 0.1๋ฐฐ์ฉ ํ์ต๋ฅ ์ด ๊ฐ์</span>
<span class="n">exp_lr_scheduler</span> <span class="o">=</span> <span class="n">optim</span><span class="o">.</span><span class="n">lr_scheduler</span><span class="o">.</span><span class="n">StepLR</span><span class="p">(</span><span class="n">optimizer_ft</span><span class="p">,</span> <span class="n">step_size</span><span class="o">=</span><span class="mi">7</span><span class="p">,</span> <span class="n">gamma</span><span class="o">=</span><span class="mf">0.1</span><span class="p">)</span>
</pre></div>
</div>
<div class="section" id="id10">
<h3>ํ์ต๊ณผ ํ๊ฐ<a class="headerlink" href="#id10" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<p>์ด ๋จ๊ณ๋ CPU์์ ์ฝ 15 ~ 25๋ถ ๊ฑธ๋ฆฝ๋๋ค. ์์ํ๋ ๋ชจ๋ธ์ CPU์์๋ง ์คํ๋๊ธฐ ๋๋ฌธ์
GPU์์๋ ํ๋ จ์ ์คํํ ์ ์์ต๋๋ค.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">new_model</span> <span class="o">=</span> <span class="n">train_model</span><span class="p">(</span><span class="n">new_model</span><span class="p">,</span> <span class="n">criterion</span><span class="p">,</span> <span class="n">optimizer_ft</span><span class="p">,</span> <span class="n">exp_lr_scheduler</span><span class="p">,</span>
<span class="n">num_epochs</span><span class="o">=</span><span class="mi">25</span><span class="p">,</span> <span class="n">device</span><span class="o">=</span><span class="s1">'cpu'</span><span class="p">)</span>
<span class="n">visualize_model</span><span class="p">(</span><span class="n">new_model</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">tight_layout</span><span class="p">()</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="finetuning">
<h2>ํํธ 2. ์์ํ ๊ฐ๋ฅํ ๋ชจ๋ธ ๋ฏธ์ธ์กฐ์ (Finetuning)<a class="headerlink" href="#finetuning" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h2>
<p>์ด๋ฒ ํํธ์์๋ ์ ์ดํ์ต(Transfer Learning)์ ์ฌ์ฉํ์ฌ ํน์ง ์ถ์ถ๊ธฐ(Feature Extractor)๋ฅผ
๋ฏธ์ธ์กฐ์ (Finetuning) ํฉ๋๋ค. ํํธ 1๊ณผ 2 ๋ชจ๋์์ ํน์ง ์ถ์ถ๊ธฐ๋ ์์ํ๋ฉ๋๋ค. ์ฐจ์ด์ ์ ํํธ 1์์
๋ฏธ๋ฆฌ ํ์ต ๋ ์์ํ ๋ชจ๋ธ์ ์ฌ์ฉํฉ๋๋ค. ์ด๋ฒ ํํธ์์, ์ฐ๋ฆฌ๋ ๊ด์ฌ์๋ ๋ฐ์ดํฐ์
์ผ๋ก ๋ฏธ์ธ์กฐ์ (Finetuning)ํ ํ
์์ํ๋ ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ์์ฑํ๋ฏ๋ก, ์์ํ์ ์ฅ์ ์ ๊ฐ์ง๋ฉด์ ์ ์ด ํ์ต(Transfer Learning)์ผ๋ก ๋ ๋์ ์ ํ๋๋ฅผ
์ป์ ์ ์์ต๋๋ค. ํน์ ํ ์์ ์์๋ ํ์ต์ฉ ์
์ ๋งค์ฐ ์๊ธฐ ๋๋ฌธ์(120๊ฐ์ ์ด๋ฏธ์ง) ์ ์ฒด ๋ชจ๋ธ์
๋ฏธ์ธ์กฐ์ (Finetuning)ํ๋ ์ฅ์ ์ด ๋ถ๋ถ๋ช
ํฉ๋๋ค. ๊ทธ๋ฌ๋ ์ฌ๊ธฐ์ ํ์๋ ์ ์ฐจ๋ ๋์ฑ ๋ ํฐ ๋ฐ์ดํฐ์
์ ์ฌ์ฉํ ์ ์ด ํ์ต(Transfer Learning)์
์ ํ๋๋ฅผ ํฅ์์ํต๋๋ค.</p>
<p>๋ฏธ๋ฆฌ ํ์ต๋ ํน์ง ์ถ์ถ๊ธฐ๋ ์์ํ๊ฐ ๊ฐ๋ฅํด์ผ ํฉ๋๋ค.
์์ํ๊ฐ ๊ฐ๋ฅํ์ง ํ์ธํ๊ธฐ ์ํด์ ๋ค์ ๋จ๊ณ๋ฅผ ์ํํ์ธ์:</p>
<blockquote>
<div><ol class="arabic simple">
<li><p><code class="docutils literal notranslate"><span class="pre">torch.quantization.fuse_modules</span></code> ๋ฅผ ์ฌ์ฉํ์ฌ <code class="docutils literal notranslate"><span class="pre">(Conv,</span> <span class="pre">BN,</span> <span class="pre">ReLU)</span></code> ,
<code class="docutils literal notranslate"><span class="pre">(Conv,</span> <span class="pre">BN)</span></code>, ๊ทธ๋ฆฌ๊ณ <code class="docutils literal notranslate"><span class="pre">(Conv,</span> <span class="pre">ReLU)</span></code> ๋ฅผ ์ตํฉํฉ๋๋ค.</p></li>
<li><p>ํน์ง ์ถ์ถ๊ธฐ๋ฅผ ์ฌ์ฉ์ ์ง์ ํค๋์ ์ฐ๊ฒฐํฉ๋๋ค. ์ด๋ฅผ ์ํด์ ํน์ง ์ถ์ถ๊ธฐ์ ์ถ๋ ฅ์ ์ญ์ผ๋ก ์์ํ ํด์ผํฉ๋๋ค.</p></li>
<li><p>ํน์ง ์ถ์ถ๊ธฐ์ ์ ํฉํ ์์น์ ๊ฐ์ง ์์ํ ๋ชจ๋์ ์ฝ์
ํ์ฌ ํ์ตํ๋ ๋์์ ์์ํ๋ฅผ ๋ชจ๋ฐฉํฉ๋๋ค.</p></li>
</ol>
</div></blockquote>
<p>(1) ๋จ๊ณ์ ๊ฒฝ์ฐ ๋ฉค๋ฒ ๋ฉ์๋(member method) <code class="docutils literal notranslate"><span class="pre">fuse_model</span></code> ์ด ์๋
<code class="docutils literal notranslate"><span class="pre">torchvision/models/quantization</span></code> ์ ๋ชจ๋ธ์ ์ฌ์ฉํฉ๋๋ค.
์ด ํจ์๋ ๋ชจ๋ <code class="docutils literal notranslate"><span class="pre">conv</span></code> , <code class="docutils literal notranslate"><span class="pre">bn</span></code> , ๊ทธ๋ฆฌ๊ณ <code class="docutils literal notranslate"><span class="pre">relu</span></code> ๋ชจ๋์ ํตํฉํฉ๋๋ค.
์ฌ์ฉ์ ์ง์ ๋ชจ๋ธ์ ๊ฒฝ์ฐ, ์๋์ผ๋ก ํตํฉํ ๋ชจ๋์ ๋ชฉ๋ก๊ณผ ํจ๊ป <code class="docutils literal notranslate"><span class="pre">torch.quantization.fuse_modules</span></code> API๋ฅผ ํธ์ถํด์ผํฉ๋๋ค.</p>
<ol class="arabic simple" start="2">
<li><p>๋จ๊ณ๋ ์ด์ ์น์
์์ ์ฌ์ฉํ <code class="docutils literal notranslate"><span class="pre">create_combined_model</span></code> ํจ์์ ์ํด์ ์ํ๋ฉ๋๋ค.</p></li>
<li><p>๋จ๊ณ๋ ๊ฐ์ง ์์ํ ๋ชจ๋์ ์ฝ์
ํ๋ <code class="docutils literal notranslate"><span class="pre">torch.quantization.prepare_qat</span></code> ๋ฅผ ์ฌ์ฉํ์ฌ ์ํ๋ฉ๋๋ค.</p></li>
<li><p>๋จ๊ณ๋ก ๋ชจ๋ธ์ ใ๋ฏธ์ธ์กฐ์ (Finetuning)ใํ ํ, ์์ ํ๊ฒ ์์ํ๋ ๋ฒ์ ์ผ๋ก ๋ณํ(5๋จ๊ณ) ํ ์ ์์ต๋๋ค.</p></li>
</ol>
<p>๋ฏธ์ธ์กฐ์ (Finetuning) ๋ชจ๋ธ์ ์์ํ๋ ๋ชจ๋ธ๋ก ๋ณํํ๋ ค๋ฉด <code class="docutils literal notranslate"><span class="pre">torch.quantization.convert</span></code> ํจ์๋ฅผ
ํธ์ถ ํ ์ ์์ต๋๋ค. (์ด ๊ฒฝ์ฐ ํน์ง ์ถ์ถ๊ธฐ๋ง ์์ํ ๋ฉ๋๋ค.)</p>
<div class="admonition note">
<p class="admonition-title">์ฐธ๊ณ </p>
<p>๋๋ค ์ด๊ธฐํ ๋๋ฌธ์ ์ฌ๋ฌ๋ถ์ ๊ฒฐ๊ณผ๊ฐ ํํ ๋ฆฌ์ผ์ ํ์๋ ๊ฒฐ๊ณผ์ ๋ค๋ฅผ ์ ์์ต๋๋ค.</p>
</div>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># `quantize=False` ๋ฅผ ์ฃผ๋ชฉํ์ธ์</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">resnet18</span><span class="p">(</span><span class="n">pretrained</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">progress</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">quantize</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">num_ftrs</span> <span class="o">=</span> <span class="n">model</span><span class="o">.</span><span class="n">fc</span><span class="o">.</span><span class="n">in_features</span>
<span class="c1"># 1 ๋จ๊ณ</span>
<span class="n">model</span><span class="o">.</span><span class="n">train</span><span class="p">()</span>
<span class="n">model</span><span class="o">.</span><span class="n">fuse_model</span><span class="p">()</span>
<span class="c1"># 2 ๋จ๊ณ</span>
<span class="n">model_ft</span> <span class="o">=</span> <span class="n">create_combined_model</span><span class="p">(</span><span class="n">model</span><span class="p">)</span>
<span class="n">model_ft</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">qconfig</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">quantization</span><span class="o">.</span><span class="n">default_qat_qconfig</span> <span class="c1"># Use default QAT configuration</span>
<span class="c1"># 3 ๋จ๊ณ</span>
<span class="n">model_ft</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">quantization</span><span class="o">.</span><span class="n">prepare_qat</span><span class="p">(</span><span class="n">model_ft</span><span class="p">,</span> <span class="n">inplace</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</pre></div>
</div>
<div class="section" id="id11">
<h3>๋ชจ๋ธ ๋ฏธ์ธ์กฐ์ <a class="headerlink" href="#id11" title="์ด ์ ๋ชฉ์ ๋ํ ํผ๋จธ๋งํฌ">ยถ</a></h3>
<p>ํ์ฌ ํํ ๋ฆฌ์ผ์์๋ ์ ์ฒด ๋ชจ๋ธ์ด ๋ฏธ์ธ์กฐ์ ๋์์ต๋๋ค.
์ผ๋ฐ์ ์ผ๋ก ์ด๊ฒ์ ๋ ๋์ ์ ํ๋๋ก ์ด์ด์ง ๊ฒ์
๋๋ค.
๊ทธ๋ฌ๋ ์ฌ๊ธฐ์๋ ํฌ๊ธฐ๊ฐ ์์ ํ์ต์ฉ ๋ฐ์ดํฐ์
์ ์ฌ์ฉํ๊ธฐ ๋๋ฌธ์ ๊ฒฐ๊ตญ ๊ณผ์ ํฉํ๊ฒ ๋ฉ๋๋ค.</p>
<p>4 ๋จ๊ณ. ๋ชจ๋ธ ๋ฏธ์ธ์กฐ์ ํ๊ธฐ</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">for</span> <span class="n">param</span> <span class="ow">in</span> <span class="n">model_ft</span><span class="o">.</span><span class="n">parameters</span><span class="p">():</span>
<span class="n">param</span><span class="o">.</span><span class="n">requires_grad</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">model_ft</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">)</span> <span class="c1"># GPU์์ ๋ฏธ์ธ์กฐ์ (Finetuning) ํ ์ ์์ต๋๋ค.</span>
<span class="n">criterion</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">CrossEntropyLoss</span><span class="p">()</span>
<span class="c1"># ์ด๋ฏธ ๋ชจ๋ ๊ฒ์ด ํ์ต๋ ์ํ์ด๋ฏ๋ก ํ์ต๋ฅ ์ด ๋ฎ์ต๋๋ค.</span>
<span class="c1"># ๋ ์์ Learning rate์ ์ฃผ๋ชฉํ์ธ์</span>
<span class="n">optimizer_ft</span> <span class="o">=</span> <span class="n">optim</span><span class="o">.</span><span class="n">SGD</span><span class="p">(</span><span class="n">model_ft</span><span class="o">.</span><span class="n">parameters</span><span class="p">(),</span> <span class="n">lr</span><span class="o">=</span><span class="mf">1e-3</span><span class="p">,</span> <span class="n">momentum</span><span class="o">=</span><span class="mf">0.9</span><span class="p">,</span> <span class="n">weight_decay</span><span class="o">=</span><span class="mf">0.1</span><span class="p">)</span>
<span class="c1"># ํ์ต๋ฅ ์ ๋ช ์ํญ๋ง๋ค 0.3๋ฐฐ ๊ฐ์์ํค๊ธฐ</span>
<span class="n">exp_lr_scheduler</span> <span class="o">=</span> <span class="n">optim</span><span class="o">.</span><span class="n">lr_scheduler</span><span class="o">.</span><span class="n">StepLR</span><span class="p">(</span><span class="n">optimizer_ft</span><span class="p">,</span> <span class="n">step_size</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">gamma</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">model_ft_tuned</span> <span class="o">=</span> <span class="n">train_model</span><span class="p">(</span><span class="n">model_ft</span><span class="p">,</span> <span class="n">criterion</span><span class="p">,</span> <span class="n">optimizer_ft</span><span class="p">,</span> <span class="n">exp_lr_scheduler</span><span class="p">,</span>
<span class="n">num_epochs</span><span class="o">=</span><span class="mi">25</span><span class="p">,</span> <span class="n">device</span><span class="o">=</span><span class="n">device</span><span class="p">)</span>
</pre></div>
</div>
<p>5 ๋จ๊ณ. ์์ํ๋ ๋ชจ๋ธ๋ก ๋ณํํ๊ธฐ</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">torch.quantization</span> <span class="kn">import</span> <span class="n">convert</span>
<span class="n">model_ft_tuned</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span>
<span class="n">model_quantized_and_trained</span> <span class="o">=</span> <span class="n">convert</span><span class="p">(</span><span class="n">model_ft_tuned</span><span class="p">,</span> <span class="n">inplace</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</pre></div>
</div>
<p>์์ํ๋ ๋ชจ๋ธ์ด ์ผ๋ถ ์ด๋ฏธ์ง์์ ์ด๋ป๊ฒ ๋์ํ๋์ง ์ดํด๋ณด๊ฒ ์ต๋๋ค.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">visualize_model</span><span class="p">(</span><span class="n">model_quantized_and_trained</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ioff</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">tight_layout</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
</pre></div>
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