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<p class="caption"><span class="caption-text">ํ์ดํ ์น(PyTorch) ๋ ์ํผ</span></p>
<ul>
<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"><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"><span class="caption-text">Introduction to PyTorch on YouTube</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt.html">Introduction to PyTorch - YouTube Series</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/introyt1_tutorial.html">Introduction to PyTorch</a></li>
<li class="toctree-l1"><a class="reference internal" href="../beginner/introyt/tensors_deeper_tutorial.html">Introduction to PyTorch Tensors</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>
</ul>
<p class="caption"><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"><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"><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="speech_command_classification_with_torchaudio_tutorial.html">Speech Command Classification with torchaudio</a></li>
<li class="toctree-l1"><a class="reference internal" href="text_to_speech_with_torchaudio.html">Text-to-speech with torchaudio</a></li>
<li class="toctree-l1"><a class="reference internal" href="forced_alignment_with_torchaudio_tutorial.html">Forced Alignment with Wav2Vec2</a></li>
</ul>
<p class="caption"><span class="caption-text">ํ
์คํธ</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../beginner/transformer_tutorial.html">nn.Transformer ์ TorchText ๋ก ์ํ์ค-ํฌ-์ํ์ค(Sequence-to-Sequence) ๋ชจ๋ธ๋งํ๊ธฐ</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">nn.Transformer์ torchtext๋ก ์ธ์ด ๋ฒ์ญํ๊ธฐ</a></li>
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<p class="caption"><span class="caption-text">๊ฐํํ์ต</span></p>
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<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="mario_rl_tutorial.html">Train a Mario-playing RL Agent</a></li>
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ํ๊ฒฝ์ ๋ฐฐํฌํ๊ธฐ</span></p>
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<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>
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<li class="toctree-l1"><a class="reference internal" href="forward_ad_usage.html">Forward-mode Automatic Differentiation (Beta)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../advanced/cpp_autograd.html">C++ ํ๋ก ํธ์๋์ ์๋ ๋ฏธ๋ถ (autograd)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../beginner/profiler.html">PyTorch ๋ชจ๋ ํ๋กํ์ผ๋ง ํ๊ธฐ</a></li>
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<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"><a class="reference internal" href="quantized_transfer_learning_tutorial.html">(๋ฒ ํ) ์ปดํจํฐ ๋น์ ํํ ๋ฆฌ์ผ์ ์ํ ์์ํ๋ ์ ์ดํ์ต(Quantized Transfer Learning)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../advanced/static_quantization_tutorial.html">(beta) Static Quantization with Eager Mode in PyTorch</a></li>
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<p class="caption"><span class="caption-text">๋ณ๋ ฌ ๋ฐ ๋ถ์ฐ ํ์ต</span></p>
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<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="model_parallel_tutorial.html">๋จ์ผ ๋จธ์ ์ ์ฌ์ฉํ ๋ชจ๋ธ ๋ณ๋ ฌํ ๋ชจ๋ฒ ์ฌ๋ก</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">๋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="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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<h1>๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ ์์ํ๊ธฐ<a class="headerlink" href="#id1" title="Permalink to this headline">ยถ</a></h1>
<p><strong>์ ์</strong>: <a class="reference external" href="https://mrshenli.github.io/">Shen Li</a></p>
<p><strong>๊ฐ์</strong>: <a class="reference external" href="https://github.com/gunandrose4u">Joe Zhu</a></p>
<p><strong>๋ฒ์ญ</strong>: <a class="reference external" href="https://github.com/Jo-byung-geun">์กฐ๋ณ๊ทผ</a></p>
<p>์ ์๊ณผ๋ชฉ(Prerequisites):</p>
<ul class="simple">
<li><a class="reference external" href="../beginner/dist_overview.html">PyTorch ๋ถ์ฐ ์ฒ๋ฆฌ ๊ฐ์</a></li>
<li><a class="reference external" href="https://pytorch.org/docs/master/generated/torch.nn.parallel.DistributedDataParallel.html">๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ API ๋ฌธ์</a></li>
<li><a class="reference external" href="https://pytorch.org/docs/master/notes/ddp.html">๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ ๋ฌธ์</a></li>
</ul>
<p><a class="reference external" href="https://pytorch.org/docs/stable/nn.html#torch.nn.parallel.DistributedDataParallel">๋ถ์ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ</a>(DDP)๋
์ฌ๋ฌ ๊ธฐ๊ธฐ์์ ์คํํ ์ ์๋ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ๋ฅผ ๋ชจ๋ ์์ค์์ ๊ตฌํํฉ๋๋ค.
DDP๋ฅผ ์ฌ์ฉํ๋ ์ดํ๋ฆฌ์ผ์ด์
์ ์ฌ๋ฌ ์์
(process)์ ์์ฑํ๊ณ ์์
๋น ๋จ์ผ DDP ์ธ์คํด์ค๋ฅผ ์์ฑํด์ผ ํฉ๋๋ค.
DDP๋ <a class="reference external" href="https://tutorials.pytorch.kr/intermediate/dist_tuto.html">torch.distributed</a>
ํจํค์ง์ ์งํฉ ํต์ (collective communication)์ ์ฌ์ฉํ์ฌ ๋ณํ๋(gradient)์ ๋ฒํผ๋ฅผ ๋๊ธฐํํฉ๋๋ค.
์ข ๋ ๊ตฌ์ฒด์ ์ผ๋ก, DDP๋ <code class="docutils literal notranslate"><span class="pre">model.parameters()</span></code>์ ์ํด ์ฃผ์ด์ง ๊ฐ ํ๋ผ๋ฏธํฐ์ ๋ํด Autograd hook์ ๋ฑ๋กํ๊ณ ,
hook์ ์ญ๋ฐฉํฅ ์ ๋ฌ์์ ํด๋น ๋ณํ๋๊ฐ ๊ณ์ฐ๋ ๋ ์๋ํฉ๋๋ค.
๋ค์์ผ๋ก DDP๋ ์ด ์ ํธ๋ฅผ ์ฌ์ฉํ์ฌ ์์
๊ฐ์ ๋ณํ๋ ๋๊ธฐํ๋ฅผ ๋ฐ์์ํต๋๋ค. ์์ธํ ๋ด์ฉ์
<a class="reference external" href="https://pytorch.org/docs/master/notes/ddp.html">DDP design note</a>๋ฅผ ์ฐธ์กฐํ์ญ์์ค.</p>
<p>DDP์ ๊ถ์ฅ ์ฌ์ฉ๋ฒ์, ์ฌ๋ฌ ์ฅ์น์ ์์ ์ ์๋ ๊ฐ ๋ชจ๋ธ ๋ณต์ ๋ณธ๋น ํ๋์ ์์
์ ์์ฑํ๋ ๊ฒ์
๋๋ค.
DDP ์์
์ ๋์ผํ ๊ธฐ๊ธฐ ๋๋ ์ฌ๋ฌ ๊ธฐ๊ธฐ์ ๋ฐฐ์นํ ์ ์์ง๋ง GPU ์ฅ์น๋ ์์
๊ฐ์ ๊ณต์ ํ ์ ์์ต๋๋ค.
์ด ํํ ๋ฆฌ์ผ์์๋ ๊ธฐ๋ณธ DDP ์ฌ์ฉ ์ฌ๋ก์์ ์์ํ์ฌ,
checkpointing ๋ชจ๋ธ ๋ฐ DDP์ ๋ชจ๋ธ ๋ณ๋ ฌ ์ฒ๋ฆฌ์ ๊ฒฐํฉ์ ํฌํจํ ์ถ๊ฐ์ ์ธ ์ฌ์ฉ ์ฌ๋ก๋ฅผ ๋ณด์ฌ์ค๋๋ค.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">์ด ํํ ๋ฆฌ์ผ์ ์ฝ๋๋ 8-GPU ์๋ฒ์์ ์คํ๋์ง๋ง ๋ค๋ฅธ ํ๊ฒฝ์์๋ ์ฝ๊ฒ ์ ์ฉํ ์ ์์ต๋๋ค.</p>
</div>
<div class="section" id="dataparallel-distributeddataparallel">
<h2><code class="docutils literal notranslate"><span class="pre">DataParallel</span></code>๊ณผ <code class="docutils literal notranslate"><span class="pre">DistributedDataParallel</span></code> ๊ฐ์ ๋น๊ต<a class="headerlink" href="#dataparallel-distributeddataparallel" title="Permalink to this headline">ยถ</a></h2>
<p>๋ด์ฉ์ ๋ค์ด๊ฐ๊ธฐ์ ์์ ๋ณต์ก์ฑ์ด ์ฆ๊ฐํ์์๋ ๋ถ๊ตฌํ๊ณ
<code class="docutils literal notranslate"><span class="pre">DataParallel</span></code>์ <code class="docutils literal notranslate"><span class="pre">DistributedDataParallel</span></code> ์ฌ์ฉ์ ๊ณ ๋ คํ๋ ์ด์ ๋ฅผ ์๊ฐํด๋ด
์๋ค.</p>
<ul class="simple">
<li>์ฒซ์งธ, <code class="docutils literal notranslate"><span class="pre">DataParallel</span></code>์ ๋จ์ผ ์์
, ๋ฉํฐ์ฐ๋ ๋์ด๋ฉฐ ๋จ์ผ ๊ธฐ๊ธฐ์์๋ง ์๋ํ๋ ๋ฐ๋ฉด,
<code class="docutils literal notranslate"><span class="pre">DistributedDataParallel</span></code>์ ๋ค์ค ์์
์ด๋ฉฐ ๋จ์ผ ๋ฐ ๋ค์ค ๊ธฐ๊ธฐ ํ์ต์ ์ ๋ถ ์ง์ํฉ๋๋ค.
<code class="docutils literal notranslate"><span class="pre">DataParallel</span></code>์ ์ฐ๋ ๋๊ฐ GIL ๊ฒฝํฉ, ๋ณต์ ๋ชจ๋ธ์ ๋ฐ๋ณต ๋น ์์ฑ, ์ฐ๋ ์
๋ ฅ ๋ฐ ์์ง ์ถ๋ ฅ์ผ๋ก ์ธํ
์ถ๊ฐ์ ์ธ ์ค๋ฒํค๋๋ก ์ธํด ์ผ๋ฐ์ ์ผ๋ก ๋จ์ผ ์์คํ
์์์กฐ์ฐจ <code class="docutils literal notranslate"><span class="pre">DistributedDataParallel</span></code>๋ณด๋ค ๋๋ฆฝ๋๋ค.</li>
<li>๋ชจ๋ธ์ด ๋๋ฌด ์ปค์ ๋จ์ผ GPU์ ๋ง์ง ์์ ๊ฒฝ์ฐ <strong>model parallel</strong>์ ์ฌ์ฉํ์ฌ ์ฌ๋ฌ GPU๋ก ๋ถํ ํด์ผ ํ๋ค๋
<a class="reference external" href="https://tutorials.pytorch.kr/intermediate/model_parallel_tutorial.html">prior tutorial</a>์ ๋ ์ฌ๋ ค ๋ณด์ธ์.
<code class="docutils literal notranslate"><span class="pre">DistributedDataParallel</span></code>์ <strong>model parallel</strong>์์ ์คํ๋์ง๋ง <code class="docutils literal notranslate"><span class="pre">DataParallel</span></code>์ ์ด๋ ์คํ๋์ง ์์ต๋๋ค.
DDP๋ฅผ ๋ชจ๋ธ ๋ณ๋ ฌ ์ฒ๋ฆฌ์ ๊ฒฐํฉํ๋ฉด ๊ฐ DDP ์์
์ ๋ชจ๋ธ ๋ณ๋ ฌ ์ฒ๋ฆฌ๋ฅผ ์ฌ์ฉํ๋ฉฐ
๋ชจ๋ ์์
์ ๋ฐ์ดํฐ ๋ณ๋ ฌ ์ฒ๋ฆฌ๋ฅผ ์ฌ์ฉํฉ๋๋ค.</li>
<li>๋ชจ๋ธ์ด ์ฌ๋ฌ ๋์ ๊ธฐ๊ธฐ์ ์กด์ฌํด์ผ ํ๊ฑฐ๋ ์ฌ์ฉ ์ฌ๋ก๊ฐ ๋ฐ์ดํฐ ๋ณ๋ ฌํ ํจ๋ฌ๋ค์์ ๋ง์ง ์๋ ๊ฒฝ์ฐ,
์ผ๋ฐ์ ์ธ ๋ถ์ฐ ํ์ต ์ง์์ ๋ณด๋ ค๋ฉด <a class="reference external" href="https://pytorch.org/docs/stable/rpc.html">the RPC API</a>๋ฅผ ์ฐธ์กฐํ์ญ์์ค.</li>
</ul>
</div>
<div class="section" id="id3">
<h2>๊ธฐ๋ณธ์ ์ธ ์ฌ์ฉ๋ฒ<a class="headerlink" href="#id3" title="Permalink to this headline">ยถ</a></h2>
<p>DDP ๋ชจ๋์ ์์ฑํ๊ธฐ ์ ์ ์ฐ์ ์์
๊ทธ๋ฃน์ ์ฌ๋ฐ๋ฅด๊ฒ ์ค์ ํด์ผ ํฉ๋๋ค. ์์ธํ ๋ด์ฉ์
<a class="reference external" href="https://tutorials.pytorch.kr/intermediate/dist_tuto.html">PYTORCH๋ก ๋ถ์ฐ ์ดํ๋ฆฌ์ผ์ด์
๊ฐ๋ฐํ๊ธฐ</a>์์ ํ์ธํ ์ ์์ต๋๋ค.</p>
<div class="code python highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">tempfile</span>
<span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">import</span> <span class="nn">torch.distributed</span> <span class="k">as</span> <span class="nn">dist</span>
<span class="kn">import</span> <span class="nn">torch.nn</span> <span class="k">as</span> <span class="nn">nn</span>
<span class="kn">import</span> <span class="nn">torch.optim</span> <span class="k">as</span> <span class="nn">optim</span>
<span class="kn">import</span> <span class="nn">torch.multiprocessing</span> <span class="k">as</span> <span class="nn">mp</span>
<span class="kn">from</span> <span class="nn">torch.nn.parallel</span> <span class="kn">import</span> <span class="n">DistributedDataParallel</span> <span class="k">as</span> <span class="n">DDP</span>
<span class="c1"># ์๋์ฐ ํ๋ซํผ์์ torch.distributed ํจํค์ง๋</span>
<span class="c1"># Gloo backend, FileStore ๋ฐ TcpStore ๋ง์ ์ง์ํฉ๋๋ค.</span>
<span class="c1"># FileStore์ ๊ฒฝ์ฐ, init_process_group ์์</span>
<span class="c1"># init_method ๋งค๊ฐ๋ณ์๋ฅผ ๋ก์ปฌ ํ์ผ๋ก ์ค์ ํฉ๋๋ค.</span>
<span class="c1"># ๋ค์ ์์:</span>
<span class="c1"># init_method="file:///f:/libtmp/some_file"</span>
<span class="c1"># dist.init_process_group(</span>
<span class="c1"># "gloo",</span>
<span class="c1"># rank=rank,</span>
<span class="c1"># init_method=init_method,</span>
<span class="c1"># world_size=world_size)</span>
<span class="c1"># TcpStore์ ๊ฒฝ์ฐ ๋ฆฌ๋
์ค์ ๋์ผํ ๋ฐฉ์์
๋๋ค.</span>
<span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">):</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s1">'MASTER_ADDR'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'localhost'</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s1">'MASTER_PORT'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'12355'</span>
<span class="c1"># ์์
๊ทธ๋ฃน ์ด๊ธฐํ</span>
<span class="n">dist</span><span class="o">.</span><span class="n">init_process_group</span><span class="p">(</span><span class="s2">"gloo"</span><span class="p">,</span> <span class="n">rank</span><span class="o">=</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="o">=</span><span class="n">world_size</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">cleanup</span><span class="p">():</span>
<span class="n">dist</span><span class="o">.</span><span class="n">destroy_process_group</span><span class="p">()</span>
</pre></div>
</div>
<p>์ด์ DDP๋ก ๊ฐ์ธ์ฌ์ง Toy ๋ชจ๋์ ์์ฑํ๊ณ ๋๋ฏธ ์
๋ ฅ ๋ฐ์ดํฐ๋ฅผ ์
๋ ฅํด ๋ณด๊ฒ ์ต๋๋ค.
์ฐ์ DDP๋ 0์์ ์์
์์๋ถํฐ DDP ์์ฑ์์ ๋ค๋ฅธ ๋ชจ๋ ์์
๋ค์๊ฒ ๋ชจ๋ธ์ ์ํ๋ฅผ ์ ๋ฌํ๋ฏ๋ก,
๋ค๋ฅธ ๋ชจ๋ธ์ ๋งค๊ฐ ๋ณ์ ์ด๊ธฐ๊ฐ๋ค์์ ์์ํ๋ ๋ค๋ฅธ DDP ์์
๋ค์ ๋ํ์ฌ ๊ฑฑ์ ํ ํ์๊ฐ ์์ต๋๋ค.</p>
<div class="code python highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">ToyModel</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">ToyModel</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">net1</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</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="bp">self</span><span class="o">.</span><span class="n">relu</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">ReLU</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">net2</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">net2</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">relu</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">net1</span><span class="p">(</span><span class="n">x</span><span class="p">)))</span>
<span class="k">def</span> <span class="nf">demo_basic</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Running basic DDP example on rank </span><span class="si">{</span><span class="n">rank</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span>
<span class="n">setup</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">)</span>
<span class="c1"># ๋ชจ๋ธ์ ์์ฑํ๊ณ ์์ ์์ด๋๊ฐ ์๋ GPU๋ก ์ ๋ฌ</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">ToyModel</span><span class="p">()</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">rank</span><span class="p">)</span>
<span class="n">ddp_model</span> <span class="o">=</span> <span class="n">DDP</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">device_ids</span><span class="o">=</span><span class="p">[</span><span class="n">rank</span><span class="p">])</span>
<span class="n">loss_fn</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">MSELoss</span><span class="p">()</span>
<span class="n">optimizer</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">ddp_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">0.001</span><span class="p">)</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">zero_grad</span><span class="p">()</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="n">ddp_model</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span>
<span class="n">labels</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">rank</span><span class="p">)</span>
<span class="n">loss_fn</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="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="n">cleanup</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">run_demo</span><span class="p">(</span><span class="n">demo_fn</span><span class="p">,</span> <span class="n">world_size</span><span class="p">):</span>
<span class="n">mp</span><span class="o">.</span><span class="n">spawn</span><span class="p">(</span><span class="n">demo_fn</span><span class="p">,</span>
<span class="n">args</span><span class="o">=</span><span class="p">(</span><span class="n">world_size</span><span class="p">,),</span>
<span class="n">nprocs</span><span class="o">=</span><span class="n">world_size</span><span class="p">,</span>
<span class="n">join</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</pre></div>
</div>
<p>๋ณด์ฌ์ง๋ ๋ฐ์ ๊ฐ์ด DDP๋ ํ์ ์์ค์ ๋ถ์ฐ ์ปค๋ฎค๋์ผ์ด์
์ธ๋ถ ์ฌํญ์ ํฌํจํ๊ณ
๋ก์ปฌ ๋ชจ๋ธ์ฒ๋ผ ๊น๋ํ API๋ฅผ ์ ๊ณตํฉ๋๋ค. ๋ณํ๋ ๋๊ธฐํ ํต์ (gradient synchronization communications)์
์ญ์ ํ ์ ๋ฌ(backward pass)๊ฐ ์ํ๋๋ฉฐ ์ญ์ ํ ๊ณ์ฐ(backward computation)๊ณผ ๊ฒน์น๊ฒ ๋ฉ๋๋ค.
<code class="docutils literal notranslate"><span class="pre">backword()</span></code>๊ฐ ๋ฐํ๋๋ฉด <code class="docutils literal notranslate"><span class="pre">param.grad</span></code>์๋ ๋๊ธฐํ๋ ๋ณํ๋ ํ
์(synchronized gradient tensor)๊ฐ ํฌํจ๋์ด ์์ต๋๋ค.
๊ธฐ๋ณธ์ ์ผ๋ก DDP๋ ์์
๊ทธ๋ฃน์ ์ค์ ํ๋๋ฐ ๋ช ๊ฐ์ LoCs๋ง์ด ํ์ํ์ง๋ง ๋ณด๋ค ๋ค์ํ๊ฒ ์ฌ์ฉํ๋ ๊ฒฝ์ฐ ์ฃผ์๊ฐ ํ์ํฉ๋๋ค.</p>
</div>
<div class="section" id="id4">
<h2>๋น๋์นญ ์์
์๋<a class="headerlink" href="#id4" title="Permalink to this headline">ยถ</a></h2>
<p>DDP์์๋ ์์ฑ์, ์์ ํ(forward pass) ๋ฐ ์ญ์ ํ ์ ๋ฌ ํธ์ถ ์ง์ ์ด ๋ถ์ฐ ๋๊ธฐํ ์ง์ (distribute synchronization point)์
๋๋ค.
์๋ก ๋ค๋ฅธ ์์
์ด ๋์ผํ ์์ ๋๊ธฐํ๋ฅผ ์์ํ๊ณ ๋์ผํ ์์๋ก ์ด๋ฌํ ๋๊ธฐํ ์ง์ ์ ๋๋ฌํ์ฌ
๊ฐ ๋๊ธฐํ ์ง์ ์ ๊ฑฐ์ ๋์์ ์ง์
์ ์๊ตฌํฉ๋๋ค.
๊ทธ๋ ์ง ์์ผ๋ฉด ๋น ๋ฅธ ์์
์ด ์ผ์ฐ ๋์ฐฉํ๊ณ ๋ค๋ฅธ ์์
์ ๋๊ธฐ ์๊ฐ์ด ์ด๊ณผ๋ ์ ์์ต๋๋ค.
๋ฐ๋ผ์ ์ฌ์ฉ์๋ ์์
๊ฐ์ ์์
๋์ ๊ท ํ ์๊ฒ ๋ถ๋ฐฐํ ํ์๊ฐ ์์ต๋๋ค.
๋๋๋ก ๋น๋์นญ ์์
(skewed processing) ์๋๋ ๋ค์๊ณผ ๊ฐ์ ์ด์ ๋ก ์ธํ์ฌ ๋ถ๊ฐํผํ๊ฒ ๋ฐ์ํฉ๋๋ค.
์๋ฅผ ๋ค์ด, ๋คํธ์ํฌ ์ง์ฐ, ๋ฆฌ์์ค ๊ฒฝ์(resource contentions), ์์ธกํ์ง ๋ชปํ ์์
๋ ๊ธ์ฆ ๋ฑ์
๋๋ค.
์ด๋ฌํ ์ํฉ์์ ์๊ฐ ์ด๊ณผ๋ฅผ ๋ฐฉ์งํ๋ ค๋ฉด, <a class="reference external" href="https://pytorch.org/docs/stable/distributed.html#torch.distributed.init_process_group">init_process_group</a>๋ฅผ
ํธ์ถํ ๋ ์ถฉ๋ถํ <code class="docutils literal notranslate"><span class="pre">timeout</span></code>๊ฐ์ ์ ๋ฌํด์ผ ํฉ๋๋ค.</p>
</div>
<div class="section" id="id5">
<h2>์ฒดํฌํฌ์ธํธ๋ฅผ ์ ์ฅํ๊ณ ์ฝ์ด์ค๊ธฐ<a class="headerlink" href="#id5" title="Permalink to this headline">ยถ</a></h2>
<p>ํ์ต ์ค์ <code class="docutils literal notranslate"><span class="pre">torch.save</span></code>์ <code class="docutils literal notranslate"><span class="pre">torch.load</span></code> ๋ก ๋ชจ๋์ ์ฒดํฌํฌ์ธํธ๋ฅผ ๋ง๋ค๊ณ ๊ทธ ์ฒดํฌํฌ์ธํธ๋ก๋ถํฐ ๋ณต๊ตฌํ๋ ๊ฒ์ด ์ผ๋ฐ์ ์
๋๋ค.
๋ ์์ธํ ๋ด์ฉ์ <a class="reference external" href="https://tutorials.pytorch.kr/beginner/saving_loading_models.html">SAVING AND LOADING MODELS</a>๋ฅผ ์ฐธ๊ณ ํ์ธ์.
DDP๋ฅผ ์ฌ์ฉํ ๋, ์ต์ ์ ๋ฐฉ๋ฒ์ ๋ชจ๋ธ์ ํ ์์
์๋ง ์ ์ฅํ๊ณ
๊ทธ ๋ชจ๋ธ์ ๋ชจ๋ ์์
์ ์ฐ๊ธฐ ๊ณผ๋ถํ(write overhead)๋ฅผ ์ค์ด๋ฉฐ ์ฝ์ด์ค๋ ๊ฒ์
๋๋ค.
์ด๋ ๋ชจ๋ ์์
์ด ๊ฐ์ ๋งค๊ฐ๋ณ์๋ก๋ถํฐ ์์๋๊ณ ๋ณํ๋๋
์ญ์ ํ ์ ๋ฌ๋ก ๋๊ธฐํ๋๋ฏ๋ก ์ตํฐ๋ง์ด์ (optimizer)๋
๋งค๊ฐ๋ณ์๋ฅผ ๋์ผํ ๊ฐ์ผ๋ก ๊ณ์ ์ค์ ํด์ผ ํ๊ธฐ ๋๋ฌธ์ ์ ํํฉ๋๋ค. ์ด๋ฌํ ์ต์ ํ๋ฅผ ์ฌ์ฉํ๋ ๊ฒฝ์ฐ,
์ ์ฅ์ด ์๋ฃ๋๊ธฐ ์ ์ ์ฝ์ด์ค๋ ์์
์ ์์ํ์ง ์๋๋ก ํด์ผ ํฉ๋๋ค. ๊ฒ๋ค๊ฐ, ๋ชจ๋์ ์ฝ์ด์ฌ ๋,
์์
์ด ๋ค๋ฅธ ๊ธฐ๊ธฐ์ ์ ๊ทผํ์ง ์๋๋ก ์ ์ ํ <code class="docutils literal notranslate"><span class="pre">map_location</span></code> ์ธ์๋ฅผ ์ ๊ณตํด์ผํฉ๋๋ค.
<code class="docutils literal notranslate"><span class="pre">map_location</span></code>๊ฐ์ด ์์ ๊ฒฝ์ฐ, <code class="docutils literal notranslate"><span class="pre">torch.load</span></code>๋ ๋จผ์ ๋ชจ๋์ CPU์ ์ฝ์ด์จ ๋ค์ ๊ฐ ๋งค๊ฐ๋ณ์๊ฐ
์ ์ฅ๋ ์์น๋ก ๋ณต์ฌํ์ฌ ๋์ผํ ์ฅ์น๋ฅผ ์ฌ์ฉํ๋ ๋์ผํ ๊ธฐ๊ธฐ์์ ๋ชจ๋ ์์
์ ๋ฐ์์ํต๋๋ค.
๋ ์ถ๊ฐ์ ์ธ ์คํจ ๋ณต๊ตฌ์ ์๋ผ์คํฑ(elasticity support)์ <a class="reference external" href="https://pytorch.org/elastic">TorchElastic</a>์ ์ฐธ๊ณ ํ์ธ์.</p>
<div class="code python highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">demo_checkpoint</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Running DDP checkpoint example on rank </span><span class="si">{</span><span class="n">rank</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span>
<span class="n">setup</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">)</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">ToyModel</span><span class="p">()</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">rank</span><span class="p">)</span>
<span class="n">ddp_model</span> <span class="o">=</span> <span class="n">DDP</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">device_ids</span><span class="o">=</span><span class="p">[</span><span class="n">rank</span><span class="p">])</span>
<span class="n">loss_fn</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">MSELoss</span><span class="p">()</span>
<span class="n">optimizer</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">ddp_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">0.001</span><span class="p">)</span>
<span class="n">CHECKPOINT_PATH</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">gettempdir</span><span class="p">()</span> <span class="o">+</span> <span class="s2">"/model.checkpoint"</span>
<span class="k">if</span> <span class="n">rank</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="c1"># ๋ชจ๋ ์์
์ ๊ฐ์ ๋งค๊ฐ๋ณ์๋ก๋ถํฐ ์์๋๋ค๊ณ ์๊ฐํด์ผ ํฉ๋๋ค.</span>
<span class="c1"># ๋ฌด์์์ ๋งค๊ฐ๋ณ์์ ๋ณํ๋๋ ์ญ์ ํ ์ ๋ฌ๋ก ๋๊ธฐํ๋ฉ๋๋ค.</span>
<span class="c1"># ๊ทธ๋ผ์ผ๋ก, ํ๋์ ์์
์ ๋ชจ๋ธ์ ์ ์ฅํ๊ธฐ์ ์ถฉ๋ถํฉ๋๋ค.</span>
<span class="n">torch</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="n">ddp_model</span><span class="o">.</span><span class="n">state_dict</span><span class="p">(),</span> <span class="n">CHECKPOINT_PATH</span><span class="p">)</span>
<span class="c1"># ์์
0์ด ์ ์ฅํ ํ ์์
1์ด ๋ชจ๋ธ์ ์ฝ์ด์ค๋๋ก barrier()๋ฅผ ์ฌ์ฉํฉ๋๋ค.</span>
<span class="n">dist</span><span class="o">.</span><span class="n">barrier</span><span class="p">()</span>
<span class="c1"># configure map_location properly</span>
<span class="n">map_location</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'cuda:</span><span class="si">%d</span><span class="s1">'</span> <span class="o">%</span> <span class="mi">0</span><span class="p">:</span> <span class="s1">'cuda:</span><span class="si">%d</span><span class="s1">'</span> <span class="o">%</span> <span class="n">rank</span><span class="p">}</span>
<span class="n">ddp_model</span><span class="o">.</span><span class="n">load_state_dict</span><span class="p">(</span>
<span class="n">torch</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">CHECKPOINT_PATH</span><span class="p">,</span> <span class="n">map_location</span><span class="o">=</span><span class="n">map_location</span><span class="p">))</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">zero_grad</span><span class="p">()</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="n">ddp_model</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span>
<span class="n">labels</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">rank</span><span class="p">)</span>
<span class="n">loss_fn</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">MSELoss</span><span class="p">()</span>
<span class="n">loss_fn</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="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"># ํ์ผ์ญ์ ๋ฅผ ๋ณดํธํ๊ธฐ ์ํด ์๋์ dist.barrier()๋ฅผ ์ฌ์ฉํ ํ์๋ ์์ต๋๋ค.</span>
<span class="c1"># DDP์ ์ญ์ ํ ์ ๋ฌ ๊ณผ์ ์ ์๋ AllReduce ์ต์ค(ops)๊ฐ ๋๊ธฐํ ๊ธฐ๋ฅ์ ์ํํ๊ธฐ ๋๋ฌธ์</span>
<span class="k">if</span> <span class="n">rank</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">CHECKPOINT_PATH</span><span class="p">)</span>
<span class="n">cleanup</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="ddp">
<h2>๋ชจ๋ธ ๋ณ๋ ฌ ์ฒ๋ฆฌ๋ฅผ ํ์ฉํ DDP<a class="headerlink" href="#ddp" title="Permalink to this headline">ยถ</a></h2>
<p>DDP๋ ๋ค์ค โ GPU ๋ชจ๋ธ์์๋ ์๋ํฉ๋๋ค.
๋ค์ค โ GPU ๋ชจ๋ธ์ ํ์ฉํ DDP๋ ๋์ฉ๋์ ๋ฐ์ดํฐ๋ฅผ ๊ฐ์ง ๋์ฉ๋ ๋ชจ๋ธ์ ํ์ต์ํฌ ๋ ํนํ ์ ์ฉํฉ๋๋ค.</p>
<div class="code python highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">ToyMpModel</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dev0</span><span class="p">,</span> <span class="n">dev1</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">ToyMpModel</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">dev0</span> <span class="o">=</span> <span class="n">dev0</span>
<span class="bp">self</span><span class="o">.</span><span class="n">dev1</span> <span class="o">=</span> <span class="n">dev1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">net1</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">nn</span><span class="o">.</span><span class="n">Linear</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="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">dev0</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">relu</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">nn</span><span class="o">.</span><span class="n">ReLU</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">net2</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">dev1</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">):</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">x</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dev0</span><span class="p">)</span>
<span class="n">x</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">relu</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">net1</span><span class="p">(</span><span class="n">x</span><span class="p">))</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">x</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dev1</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">net2</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
</pre></div>
</div>
<p>๋ค์ค GPU ๋ชจ๋ธ์ DDP๋ก ์ ๋ฌํ ๋, <code class="docutils literal notranslate"><span class="pre">device_ids</span></code>์ <code class="docutils literal notranslate"><span class="pre">output_device</span></code>๋ฅผ ์ค์ ํ์ง ์์์ผ ํฉ๋๋ค.
์
๋ ฅ ๋ฐ ์ถ๋ ฅ ๋ฐ์ดํฐ๋ ์ดํ๋ฆฌ์ผ์ด์
๋๋ ๋ชจ๋ธ <code class="docutils literal notranslate"><span class="pre">forward()</span></code>์ ์ํด ์ ์ ํ ์ฅ์น์ ๋ฐฐ์น๋ฉ๋๋ค.</p>
<div class="code python highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">demo_model_parallel</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">):</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Running DDP with model parallel example on rank </span><span class="si">{</span><span class="n">rank</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span>
<span class="n">setup</span><span class="p">(</span><span class="n">rank</span><span class="p">,</span> <span class="n">world_size</span><span class="p">)</span>
<span class="c1"># ์์
์ ์ํ mp_model ๋ฐ ์ฅ์น ์ค์ </span>
<span class="n">dev0</span> <span class="o">=</span> <span class="p">(</span><span class="n">rank</span> <span class="o">*</span> <span class="mi">2</span><span class="p">)</span> <span class="o">%</span> <span class="n">world_size</span>
<span class="n">dev1</span> <span class="o">=</span> <span class="p">(</span><span class="n">rank</span> <span class="o">*</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span> <span class="o">%</span> <span class="n">world_size</span>
<span class="n">mp_model</span> <span class="o">=</span> <span class="n">ToyMpModel</span><span class="p">(</span><span class="n">dev0</span><span class="p">,</span> <span class="n">dev1</span><span class="p">)</span>
<span class="n">ddp_mp_model</span> <span class="o">=</span> <span class="n">DDP</span><span class="p">(</span><span class="n">mp_model</span><span class="p">)</span>
<span class="n">loss_fn</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">MSELoss</span><span class="p">()</span>
<span class="n">optimizer</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">ddp_mp_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">0.001</span><span class="p">)</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">zero_grad</span><span class="p">()</span>
<span class="c1"># ์ถ๋ ฅ๊ฐ์ dev1์ ์ ์ฅ</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="n">ddp_mp_model</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span>
<span class="n">labels</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">dev1</span><span class="p">)</span>
<span class="n">loss_fn</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="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="n">cleanup</span><span class="p">()</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span>
<span class="n">n_gpus</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">cuda</span><span class="o">.</span><span class="n">device_count</span><span class="p">()</span>
<span class="k">assert</span> <span class="n">n_gpus</span> <span class="o">>=</span> <span class="mi">2</span><span class="p">,</span> <span class="sa">f</span><span class="s2">"Requires at least 2 GPUs to run, but got </span><span class="si">{</span><span class="n">n_gpus</span><span class="si">}</span><span class="s2">"</span>
<span class="n">world_size</span> <span class="o">=</span> <span class="n">n_gpus</span>
<span class="n">run_demo</span><span class="p">(</span><span class="n">demo_basic</span><span class="p">,</span> <span class="n">world_size</span><span class="p">)</span>
<span class="n">run_demo</span><span class="p">(</span><span class="n">demo_checkpoint</span><span class="p">,</span> <span class="n">world_size</span><span class="p">)</span>
<span class="n">run_demo</span><span class="p">(</span><span class="n">demo_model_parallel</span><span class="p">,</span> <span class="n">world_size</span><span class="p">)</span>
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<li><a class="reference internal" href="#dataparallel-distributeddataparallel"><code class="docutils literal notranslate"><span class="pre">DataParallel</span></code>๊ณผ <code class="docutils literal notranslate"><span class="pre">DistributedDataParallel</span></code> ๊ฐ์ ๋น๊ต</a></li>
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