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<meta charset="utf-8" /><meta name="hf:doc:metadata" content="{&quot;title&quot;:&quot;Using multiple models with DeepSpeed&quot;,&quot;local&quot;:&quot;using-multiple-models-with-deepspeed&quot;,&quot;sections&quot;:[{&quot;title&quot;:&quot;Knowledge distillation&quot;,&quot;local&quot;:&quot;knowledge-distillation&quot;,&quot;sections&quot;:[{&quot;title&quot;:&quot;Student model&quot;,&quot;local&quot;:&quot;student-model&quot;,&quot;sections&quot;:[],&quot;depth&quot;:3},{&quot;title&quot;:&quot;Teacher model&quot;,&quot;local&quot;:&quot;teacher-model&quot;,&quot;sections&quot;:[],&quot;depth&quot;:3},{&quot;title&quot;:&quot;Training&quot;,&quot;local&quot;:&quot;training&quot;,&quot;sections&quot;:[],&quot;depth&quot;:3}],&quot;depth&quot;:2},{&quot;title&quot;:&quot;Train multiple disjoint models&quot;,&quot;local&quot;:&quot;train-multiple-disjoint-models&quot;,&quot;sections&quot;:[],&quot;depth&quot;:2},{&quot;title&quot;:&quot;Resources&quot;,&quot;local&quot;:&quot;resources&quot;,&quot;sections&quot;:[],&quot;depth&quot;:2}],&quot;depth&quot;:1}">
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 <link rel="modulepreload" href="/docs/accelerate/main/en/_app/immutable/chunks/CodeBlock.12f7bb13.js"><!-- HEAD_svelte-u9bgzb_START --><meta name="hf:doc:metadata" content="{&quot;title&quot;:&quot;Using multiple models with DeepSpeed&quot;,&quot;local&quot;:&quot;using-multiple-models-with-deepspeed&quot;,&quot;sections&quot;:[{&quot;title&quot;:&quot;Knowledge distillation&quot;,&quot;local&quot;:&quot;knowledge-distillation&quot;,&quot;sections&quot;:[{&quot;title&quot;:&quot;Student model&quot;,&quot;local&quot;:&quot;student-model&quot;,&quot;sections&quot;:[],&quot;depth&quot;:3},{&quot;title&quot;:&quot;Teacher model&quot;,&quot;local&quot;:&quot;teacher-model&quot;,&quot;sections&quot;:[],&quot;depth&quot;:3},{&quot;title&quot;:&quot;Training&quot;,&quot;local&quot;:&quot;training&quot;,&quot;sections&quot;:[],&quot;depth&quot;:3}],&quot;depth&quot;:2},{&quot;title&quot;:&quot;Train multiple disjoint models&quot;,&quot;local&quot;:&quot;train-multiple-disjoint-models&quot;,&quot;sections&quot;:[],&quot;depth&quot;:2},{&quot;title&quot;:&quot;Resources&quot;,&quot;local&quot;:&quot;resources&quot;,&quot;sections&quot;:[],&quot;depth&quot;:2}],&quot;depth&quot;:1}"><!-- HEAD_svelte-u9bgzb_END --> <p></p> <div class="items-center shrink-0 min-w-[100px] max-sm:min-w-[50px] justify-end ml-auto flex" style="float: right; margin-left: 10px; display: inline-flex; position: relative; z-index: 10;"><div class="inline-flex rounded-md max-sm:rounded-sm"><button class="inline-flex items-center gap-1 h-7 max-sm:h-7 px-2 max-sm:px-1.5 text-sm font-medium text-gray-800 border border-r-0 rounded-l-md max-sm:rounded-l-sm border-gray-200 bg-white hover:shadow-inner dark:border-gray-850 dark:bg-gray-950 dark:text-gray-200 dark:hover:bg-gray-800" aria-live="polite"><span class="inline-flex items-center justify-center rounded-md p-0.5 max-sm:p-0 hover:text-gray-800 dark:hover:text-gray-200"><svg class="sm:size-3.5 size-3" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg></span> <span>Copy page</span></button> <button class="inline-flex items-center justify-center w-6 max-sm:w-5 h-7 max-sm:h-7 disabled:pointer-events-none text-sm text-gray-500 hover:text-gray-700 dark:hover:text-white rounded-r-md max-sm:rounded-r-sm border border-l transition border-gray-200 bg-white hover:shadow-inner dark:border-gray-850 dark:bg-gray-950 dark:text-gray-200 dark:hover:bg-gray-800" aria-haspopup="menu" aria-expanded="false" aria-label="Open copy menu"><svg class="transition-transform text-gray-400 overflow-visible sm:size-3.5 size-3 rotate-0" width="1em" height="1em" viewBox="0 0 12 7" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M1 1L6 6L11 1" stroke="currentColor"></path></svg></button></div> </div> <h1 class="relative group"><a id="using-multiple-models-with-deepspeed" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#using-multiple-models-with-deepspeed"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Using multiple models with DeepSpeed</span></h1> <blockquote class="warning"><p data-svelte-h="svelte-1geb81d">This guide assumes that you have read and understood the <a href="./deepspeed">DeepSpeed usage guide</a>.</p></blockquote> <p data-svelte-h="svelte-1b1gxyz">Running multiple models with Accelerate and DeepSpeed is useful for:</p> <ul data-svelte-h="svelte-7mvbd"><li>Knowledge distillation</li> <li>Post-training techniques like RLHF (see the <a href="https://github.com/huggingface/trl" rel="nofollow">TRL</a> library for more examples)</li> <li>Training multiple models at once</li></ul> <p data-svelte-h="svelte-e8xs1z">Currently, Accelerate has a <strong>very experimental API</strong> to help you use multiple models.</p> <p data-svelte-h="svelte-owdl16">This tutorial will focus on two common use cases:</p> <ol data-svelte-h="svelte-to0mxc"><li>Knowledge distillation, where a smaller student model is trained to mimic a larger, better-performing teacher. If the student model fits on a single GPU, we can use ZeRO-2 for training and ZeRO-3 to shard the teacher for inference. This is significantly faster than using ZeRO-3 for both models.</li> <li>Training multiple <em>disjoint</em> models at once.</li></ol> <h2 class="relative group"><a id="knowledge-distillation" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#knowledge-distillation"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Knowledge distillation</span></h2> <p data-svelte-h="svelte-zc35yl">Knowledge distillation is a good example of using multiple models, but only training one of them.</p> <p data-svelte-h="svelte-15gxojo">Normally, you would use a single <a href="/docs/accelerate/main/en/package_reference/deepspeed#accelerate.DeepSpeedPlugin">utils.DeepSpeedPlugin</a> for both models. However, in this case, there are two separate configurations. Accelerate allows you to create and use multiple plugins <strong>if and only if</strong> they are in a <code>dict</code> so that you can reference and enable the proper plugin when needed.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START --><span class="hljs-keyword">from</span> accelerate.utils <span class="hljs-keyword">import</span> DeepSpeedPlugin
zero2_plugin = DeepSpeedPlugin(hf_ds_config=<span class="hljs-string">&quot;zero2_config.json&quot;</span>)
zero3_plugin = DeepSpeedPlugin(hf_ds_config=<span class="hljs-string">&quot;zero3_config.json&quot;</span>)
deepspeed_plugins = {<span class="hljs-string">&quot;student&quot;</span>: zero2_plugin, <span class="hljs-string">&quot;teacher&quot;</span>: zero3_plugin}<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-4l2obz">The <code>zero2_config.json</code> should be configured for full training (so specify <code>scheduler</code> and <code>optimizer</code> if you are not utilizing your own), while <code>zero3_config.json</code> should only be configured for the inference model, as shown in the example below.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-json "><!-- HTML_TAG_START --><span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;bf16&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;enabled&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;zero_optimization&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;stage&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-number">3</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;overlap_comm&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;reduce_bucket_size&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;stage3_prefetch_bucket_size&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;stage3_param_persistence_threshold&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;stage3_max_live_parameters&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;stage3_max_reuse_distance&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;train_micro_batch_size_per_gpu&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1</span>
<span class="hljs-punctuation">}</span><!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-2zuo2r">An example <code>zero2_config.json</code> configuration is shown below.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-json "><!-- HTML_TAG_START --><span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;bf16&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;enabled&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;optimizer&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;type&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;AdamW&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;params&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;lr&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;weight_decay&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;torch_adam&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;adam_w_mode&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span>
 <span class="hljs-punctuation">}</span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;scheduler&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;type&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;WarmupLR&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;params&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;warmup_min_lr&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;warmup_max_lr&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;warmup_num_steps&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span>
 <span class="hljs-punctuation">}</span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;zero_optimization&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;stage&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-number">2</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;offload_optimizer&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
 <span class="hljs-attr">&quot;device&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;cpu&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;pin_memory&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;gradient_accumulation_steps&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;gradient_clipping&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;train_batch_size&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
 <span class="hljs-attr">&quot;train_micro_batch_size_per_gpu&quot;</span><span class="hljs-punctuation">:</span> <span class="hljs-string">&quot;auto&quot;</span><span class="hljs-punctuation">,</span>
<span class="hljs-punctuation">}</span><!-- HTML_TAG_END --></pre></div> <blockquote class="tip"><p data-svelte-h="svelte-qz5bxi">DeepSpeed will raise an error if <code>train_micro_batch_size_per_gpu</code> isn’t specified, even if this particular model isn’t being trained.</p></blockquote> <p data-svelte-h="svelte-t7yg3i">From here, create a single <a href="/docs/accelerate/main/en/package_reference/accelerator#accelerate.Accelerator">Accelerator</a> and pass in both configurations.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START --><span class="hljs-keyword">from</span> accelerate <span class="hljs-keyword">import</span> Accelerator
accelerator = Accelerator(deepspeed_plugins=deepspeed_plugins)<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-edf8im">Now let’s see how to use them.</p> <h3 class="relative group"><a id="student-model" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#student-model"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Student model</span></h3> <p data-svelte-h="svelte-bgcpa4">By default, Accelerate sets the first item in the <code>dict</code> as the default or enabled plugin (<code>&quot;student&quot;</code> plugin). Verify this by using the <a href="/docs/accelerate/main/en/package_reference/deepspeed#accelerate.utils.get_active_deepspeed_plugin">utils.deepspeed.get_active_deepspeed_plugin()</a> function to see which plugin is enabled.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START -->active_plugin = get_active_deepspeed_plugin(accelerator.state)
<span class="hljs-keyword">assert</span> active_plugin <span class="hljs-keyword">is</span> deepspeed_plugins[<span class="hljs-string">&quot;student&quot;</span>]<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-m0abi0"><code>AcceleratorState</code> also keeps the active DeepSpeed plugin saved in <code>state.deepspeed_plugin</code>.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START --><span class="hljs-keyword">assert</span> active_plugin <span class="hljs-keyword">is</span> accelerator.deepspeed_plugin<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-107qzzz">Since <code>student</code> is the currently active plugin, let’s go ahead and prepare the model, optimizer, and scheduler.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START -->student_model, optimizer, scheduler = ...
student_model, optimizer, scheduler, train_dataloader = accelerator.prepare(student_model, optimizer, scheduler, train_dataloader)<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-202ivx">Now it’s time to deal with the teacher model.</p> <h3 class="relative group"><a id="teacher-model" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#teacher-model"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Teacher model</span></h3> <p data-svelte-h="svelte-11n7i8s">First, you need to specify in <a href="/docs/accelerate/main/en/package_reference/accelerator#accelerate.Accelerator">Accelerator</a> that the <code>zero3_config.json</code> configuration should be used.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START -->accelerator.state.select_deepspeed_plugin(<span class="hljs-string">&quot;teacher&quot;</span>)<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-171sb04">This disables the <code>&quot;student&quot;</code> plugin and enables the <code>&quot;teacher&quot;</code> plugin instead. The
DeepSpeed stateful config inside of Transformers is updated, and it changes which plugin configuration gets called when using
<code>deepspeed.initialize()</code>. This allows you to use the automatic <code>deepspeed.zero.Init</code> context manager integration Transformers provides.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START -->teacher_model = AutoModel.from_pretrained(...)
teacher_model = accelerator.prepare(teacher_model)<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-14r7t5t">Otherwise, you should manually initialize the model with <code>deepspeed.zero.Init</code>.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START --><span class="hljs-keyword">with</span> deepspeed.zero.Init(accelerator.deepspeed_plugin.config):
 model = MyModel(...)<!-- HTML_TAG_END --></pre></div> <h3 class="relative group"><a id="training" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#training"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Training</span></h3> <p data-svelte-h="svelte-1843po4">From here, your training loop can be whatever you like, as long as <code>teacher_model</code> is never being trained on.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START -->teacher_model.<span class="hljs-built_in">eval</span>()
student_model.train()
<span class="hljs-keyword">for</span> batch <span class="hljs-keyword">in</span> train_dataloader:
 <span class="hljs-keyword">with</span> torch.no_grad():
 output_teacher = teacher_model(**batch)
 output_student = student_model(**batch)
 <span class="hljs-comment"># Combine the losses or modify it in some way</span>
 loss = output_teacher.loss + output_student.loss
 accelerator.backward(loss)
 optimizer.step()
 scheduler.step()
 optimizer.zero_grad()<!-- HTML_TAG_END --></pre></div> <h2 class="relative group"><a id="train-multiple-disjoint-models" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#train-multiple-disjoint-models"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Train multiple disjoint models</span></h2> <p data-svelte-h="svelte-16bzhhs">Training multiple models is a more complicated scenario.
In its current state, we assume each model is <strong>completely disjointed</strong> from the other during training.</p> <p data-svelte-h="svelte-nnmvub">This scenario still requires two <a href="/docs/accelerate/main/en/package_reference/deepspeed#accelerate.DeepSpeedPlugin">utils.DeepSpeedPlugin</a>’s to be made. However, you also need a second <a href="/docs/accelerate/main/en/package_reference/accelerator#accelerate.Accelerator">Accelerator</a>, since different <code>deepspeed</code> engines are being called at different times. A single <a href="/docs/accelerate/main/en/package_reference/accelerator#accelerate.Accelerator">Accelerator</a> can only carry one instance at a time.</p> <p data-svelte-h="svelte-177w6m0">Since the <a href="/docs/accelerate/main/en/package_reference/state#accelerate.state.AcceleratorState">state.AcceleratorState</a> is a stateful object though, it is already aware of both <a href="/docs/accelerate/main/en/package_reference/deepspeed#accelerate.DeepSpeedPlugin">utils.DeepSpeedPlugin</a>’s available. You can just instantiate a second <a href="/docs/accelerate/main/en/package_reference/accelerator#accelerate.Accelerator">Accelerator</a> with no extra arguments.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START -->first_accelerator = Accelerator(deepspeed_plugins=deepspeed_plugins)
second_accelerator = Accelerator()<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-5wgsij">You can call either <code>first_accelerator.state.select_deepspeed_plugin()</code> to enable or disable
a particular plugin, and then call <code>prepare</code>.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START --><span class="hljs-comment"># can be `accelerator_0`, `accelerator_1`, or by calling `AcceleratorState().select_deepspeed_plugin(...)`</span>
first_accelerator.state.select_deepspeed_plugin(<span class="hljs-string">&quot;first_model&quot;</span>)
first_model = AutoModel.from_pretrained(...)
<span class="hljs-comment"># For this example, `get_training_items` is a nonexistent function that gets the setup we need for training</span>
first_optimizer, first_scheduler, train_dl, eval_dl = get_training_items(model1)
first_model, first_optimizer, first_scheduler, train_dl, eval_dl = accelerator.prepare(
 first_model, first_optimizer, first_scheduler, train_dl, eval_dl
)
second_accelerator.state.select_deepspeed_plugin(<span class="hljs-string">&quot;second_model&quot;</span>)
second_model = AutoModel.from_pretrained(...)
<span class="hljs-comment"># For this example, `get_training_items` is a nonexistent function that gets the setup we need for training</span>
second_optimizer, second_scheduler, _, _ = get_training_items(model2)
second_model, second_optimizer, second_scheduler = accelerator.prepare(
 second_model, second_optimizer, second_scheduler
)<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-1oe955w">And now you can train:</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class="language-python "><!-- HTML_TAG_START --><span class="hljs-keyword">for</span> batch <span class="hljs-keyword">in</span> dl:
 outputs1 = first_model(**batch)
 first_accelerator.backward(outputs1.loss)
 first_optimizer.step()
 first_scheduler.step()
 first_optimizer.zero_grad()
outputs2 = model2(**batch)
 second_accelerator.backward(outputs2.loss)
 second_optimizer.step()
 second_scheduler.step()
 second_optimizer.zero_grad()<!-- HTML_TAG_END --></pre></div> <h2 class="relative group"><a id="resources" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#resources"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Resources</span></h2> <p data-svelte-h="svelte-1hqyy97">To see more examples, please check out the <a href="https://github.com/huggingface/accelerate/blob/main/src/accelerate/test_utils/scripts/external_deps/test_ds_multiple_model.py" rel="nofollow">related tests</a> currently in [Accelerate].</p> <a class="!text-gray-400 !no-underline text-sm flex items-center not-prose mt-4" href="https://github.com/huggingface/accelerate/blob/main/docs/source/usage_guides/deepspeed_multiple_model.md" target="_blank"><svg class="mr-1" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M31,16l-7,7l-1.41-1.41L28.17,16l-5.58-5.59L24,9l7,7z"></path><path d="M1,16l7-7l1.41,1.41L3.83,16l5.58,5.59L8,23l-7-7z"></path><path d="M12.419,25.484L17.639,6.552l1.932,0.518L14.351,26.002z"></path></svg> <span data-svelte-h="svelte-zjs2n5"><span class="underline">Update</span> on GitHub</span></a> <p></p>
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