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<div class="section" id="torch-logging">
<h1>torch._logging<a class="headerlink" href="#torch-logging" title="Permalink to this heading">¶</a></h1>
<p>PyTorch has a configurable logging system, where different components can be
given different log level settings. For instance, one component’s log messages
can be completely disabled, while another component’s log messages can be
set to maximum verbosity.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This feature is a prototype and may have compatibility breaking
changes in the future.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This feature has not been expanded to control the log messages of
all components in PyTorch yet.</p>
</div>
<p>There are two ways to configure the logging system: through the environment variable <code class="docutils literal notranslate"><span class="pre">TORCH_LOGS</span></code>
or the python API torch._logging.set_logs.</p>
<span class="target" id="module-torch._logging"></span><table class="autosummary longtable docutils colwidths-auto align-default">
<tbody>
<tr class="row-odd"><td><p><p id="torch._logging.set_logs"/><a class="reference internal" href="generated/torch._logging.set_logs.html#torch._logging.set_logs" title="torch._logging.set_logs"><code class="xref py py-obj docutils literal notranslate"><span class="pre">set_logs</span></code></a></p></td>
<td><p>Sets the log level for individual components and toggles individual log artifact types.</p></td>
</tr>
</tbody>
</table>
<p>The environment variable <code class="docutils literal notranslate"><span class="pre">TORCH_LOGS</span></code> is a comma-separated list of
<code class="docutils literal notranslate"><span class="pre">[+-]<component></span></code> pairs, where <code class="docutils literal notranslate"><span class="pre"><component></span></code> is a component specified below. The <code class="docutils literal notranslate"><span class="pre">+</span></code> prefix
will decrease the log level of the component, displaying more log messages while the <code class="docutils literal notranslate"><span class="pre">-</span></code> prefix
will increase the log level of the component and display fewer log messages. The default setting
is the behavior when a component is not specified in <code class="docutils literal notranslate"><span class="pre">TORCH_LOGS</span></code>. In addition to components, there are
also artifacts. Artifacts are specific pieces of debug information associated with a component that are either displayed or not displayed,
so prefixing an artifact with <code class="docutils literal notranslate"><span class="pre">+</span></code> or <code class="docutils literal notranslate"><span class="pre">-</span></code> will be a no-op. Since they are associated with a component, enabling that component will typically also enable that artifact,
unless that artifact was specified to be <cite>off_by_default</cite>. This option is specified in _registrations.py for artifacts that are so spammy they should only be displayed when explicitly enabled.
The following components and artifacts are configurable through the <code class="docutils literal notranslate"><span class="pre">TORCH_LOGS</span></code> environment
variable (see torch._logging.set_logs for the python API):</p>
<dl>
<dt>Components:</dt><dd><dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">all</span></code></dt><dd><p>Special component which configures the default log level of all components. Default: <code class="docutils literal notranslate"><span class="pre">logging.WARN</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">dynamo</span></code></dt><dd><p>The log level for the TorchDynamo component. Default: <code class="docutils literal notranslate"><span class="pre">logging.WARN</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">aot</span></code></dt><dd><p>The log level for the AOTAutograd component. Default: <code class="docutils literal notranslate"><span class="pre">logging.WARN</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">inductor</span></code></dt><dd><p>The log level for the TorchInductor component. Default: <code class="docutils literal notranslate"><span class="pre">logging.WARN</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">your.custom.module</span></code></dt><dd><p>The log level for an arbitrary unregistered module. Provide the fully qualified name and the module will be enabled. Default: <code class="docutils literal notranslate"><span class="pre">logging.WARN</span></code></p>
</dd>
</dl>
</dd>
<dt>Artifacts:</dt><dd><dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">bytecode</span></code></dt><dd><p>Whether to emit the original and generated bytecode from TorchDynamo.
Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">aot_graphs</span></code></dt><dd><p>Whether to emit the graphs generated by AOTAutograd. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">aot_joint_graph</span></code></dt><dd><p>Whether to emit the joint forward-backward graph generated by AOTAutograd. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">compiled_autograd</span></code></dt><dd><p>Whether to emit logs from compiled_autograd. Defaults: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">ddp_graphs</span></code></dt><dd><p>Whether to emit graphs generated by DDPOptimizer. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">graph</span></code></dt><dd><p>Whether to emit the graph captured by TorchDynamo in tabular format.
Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">graph_code</span></code></dt><dd><p>Whether to emit the python source of the graph captured by TorchDynamo.
Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">graph_breaks</span></code></dt><dd><p>Whether to emit a message when a unique graph break is encountered during
TorchDynamo tracing. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">guards</span></code></dt><dd><p>Whether to emit the guards generated by TorchDynamo for each compiled
function. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">recompiles</span></code></dt><dd><p>Whether to emit a guard failure reason and message every time
TorchDynamo recompiles a function. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">output_code</span></code></dt><dd><p>Whether to emit the TorchInductor output code. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">schedule</span></code></dt><dd><p>Whether to emit the TorchInductor schedule. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd>
</dl>
</dd>
<dt>Examples:</dt><dd><p><code class="docutils literal notranslate"><span class="pre">TORCH_LOGS="+dynamo,aot"</span></code> will set the log level of TorchDynamo to <code class="docutils literal notranslate"><span class="pre">logging.DEBUG</span></code> and AOT to <code class="docutils literal notranslate"><span class="pre">logging.INFO</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">TORCH_LOGS="-dynamo,+inductor"</span></code> will set the log level of TorchDynamo to <code class="docutils literal notranslate"><span class="pre">logging.ERROR</span></code> and TorchInductor to <code class="docutils literal notranslate"><span class="pre">logging.DEBUG</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">TORCH_LOGS="aot_graphs"</span></code> will enable the <code class="docutils literal notranslate"><span class="pre">aot_graphs</span></code> artifact</p>
<p><code class="docutils literal notranslate"><span class="pre">TORCH_LOGS="+dynamo,schedule"</span></code> will enable set the log level of TorchDynamo to <code class="docutils literal notranslate"><span class="pre">logging.DEBUG</span></code> and enable the <code class="docutils literal notranslate"><span class="pre">schedule</span></code> artifact</p>
<p><code class="docutils literal notranslate"><span class="pre">TORCH_LOGS="+some.random.module,schedule"</span></code> will set the log level of some.random.module to <code class="docutils literal notranslate"><span class="pre">logging.DEBUG</span></code> and enable the <code class="docutils literal notranslate"><span class="pre">schedule</span></code> artifact</p>
</dd>
</dl>
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