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| <link rel="modulepreload" href="/docs/diffusers/pr_12448/en/_app/immutable/chunks/CodeBlock.d30a6509.js"><!-- HEAD_svelte-u9bgzb_START --><meta name="hf:doc:metadata" content="{"title":"LoopSequentialPipelineBlocks","local":"loopsequentialpipelineblocks","sections":[{"title":"Loop wrapper","local":"loop-wrapper","sections":[],"depth":2},{"title":"Loop blocks","local":"loop-blocks","sections":[],"depth":2},{"title":"LoopSequentialPipelineBlocks","local":"loopsequentialpipelineblocks","sections":[],"depth":2}],"depth":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 max-sm:gap-0.5 h-6 max-sm:h-5 px-2 max-sm:px-1.5 text-[11px] max-sm:text-[9px] 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"><svg class="w-3 h-3 max-sm:w-2.5 max-sm:h-2.5" 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-6 max-sm:h-5 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 w-3 h-3 max-sm:w-2.5 max-sm:h-2.5 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="loopsequentialpipelineblocks" 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="#loopsequentialpipelineblocks"><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>LoopSequentialPipelineBlocks</span></h1> <p data-svelte-h="svelte-1390flz"><a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.modular_pipelines.LoopSequentialPipelineBlocks">LoopSequentialPipelineBlocks</a> are a multi-block type that composes other <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.ModularPipelineBlocks">ModularPipelineBlocks</a> together in a loop. Data flows circularly, using <code>inputs</code> and <code>intermediate_outputs</code>, and each block is run iteratively. This is typically used to create a denoising loop which is iterative by default.</p> <p data-svelte-h="svelte-1dvtqaw">This guide shows you how to create <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.modular_pipelines.LoopSequentialPipelineBlocks">LoopSequentialPipelineBlocks</a>.</p> <h2 class="relative group"><a id="loop-wrapper" 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="#loop-wrapper"><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>Loop wrapper</span></h2> <p data-svelte-h="svelte-g97y8i"><a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.modular_pipelines.LoopSequentialPipelineBlocks">LoopSequentialPipelineBlocks</a>, is also known as the <em>loop wrapper</em> because it defines the loop structure, iteration variables, and configuration. Within the loop wrapper, you need the following variables.</p> <ul data-svelte-h="svelte-1uzgchz"><li><code>loop_inputs</code> are user provided values and equivalent to <code>inputs</code>.</li> <li><code>loop_intermediate_outputs</code> are new intermediate variables created by the block and added to the <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_states#diffusers.modular_pipelines.PipelineState">PipelineState</a>. It is equivalent to <code>intermediate_outputs</code>.</li> <li><code>__call__</code> method defines the loop structure and iteration logic.</li></ul> <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=""><!-- HTML_TAG_START --><span class="hljs-keyword">import</span> torch | |
| <span class="hljs-keyword">from</span> diffusers.modular_pipelines <span class="hljs-keyword">import</span> LoopSequentialPipelineBlocks, ModularPipelineBlocks, InputParam, OutputParam | |
| <span class="hljs-keyword">class</span> <span class="hljs-title class_">LoopWrapper</span>(<span class="hljs-title class_ inherited__">LoopSequentialPipelineBlocks</span>): | |
| model_name = <span class="hljs-string">"test"</span> | |
| <span class="hljs-meta"> @property</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">description</span>(<span class="hljs-params">self</span>): | |
| <span class="hljs-keyword">return</span> <span class="hljs-string">"I'm a loop!!"</span> | |
| <span class="hljs-meta"> @property</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">loop_inputs</span>(<span class="hljs-params">self</span>): | |
| <span class="hljs-keyword">return</span> [InputParam(name=<span class="hljs-string">"num_steps"</span>)] | |
| <span class="hljs-meta"> @torch.no_grad()</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">__call__</span>(<span class="hljs-params">self, components, state</span>): | |
| block_state = self.get_block_state(state) | |
| <span class="hljs-comment"># Loop structure - can be customized to your needs</span> | |
| <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(block_state.num_steps): | |
| <span class="hljs-comment"># loop_step executes all registered blocks in sequence</span> | |
| components, block_state = self.loop_step(components, block_state, i=i) | |
| self.set_block_state(state, block_state) | |
| <span class="hljs-keyword">return</span> components, state<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-ldw13v">The loop wrapper can pass additional arguments, like current iteration index, to the loop blocks.</p> <h2 class="relative group"><a id="loop-blocks" 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="#loop-blocks"><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>Loop blocks</span></h2> <p data-svelte-h="svelte-7h8zzv">A loop block is a <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.ModularPipelineBlocks">ModularPipelineBlocks</a>, but the <code>__call__</code> method behaves differently.</p> <ul data-svelte-h="svelte-ugkeh3"><li>It receives the iteration variable from the loop wrapper.</li> <li>It works directly with the <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_states#diffusers.modular_pipelines.BlockState">BlockState</a> instead of the <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_states#diffusers.modular_pipelines.PipelineState">PipelineState</a>.</li> <li>It doesn’t require retrieving or updating the <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_states#diffusers.modular_pipelines.BlockState">BlockState</a>.</li></ul> <p data-svelte-h="svelte-s4eyin">Loop blocks share the same <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_states#diffusers.modular_pipelines.BlockState">BlockState</a> to allow values to accumulate and change for each iteration in the loop.</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=""><!-- HTML_TAG_START --><span class="hljs-keyword">class</span> <span class="hljs-title class_">LoopBlock</span>(<span class="hljs-title class_ inherited__">ModularPipelineBlocks</span>): | |
| model_name = <span class="hljs-string">"test"</span> | |
| <span class="hljs-meta"> @property</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">inputs</span>(<span class="hljs-params">self</span>): | |
| <span class="hljs-keyword">return</span> [InputParam(name=<span class="hljs-string">"x"</span>)] | |
| <span class="hljs-meta"> @property</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">intermediate_outputs</span>(<span class="hljs-params">self</span>): | |
| <span class="hljs-comment"># outputs produced by this block</span> | |
| <span class="hljs-keyword">return</span> [OutputParam(name=<span class="hljs-string">"x"</span>)] | |
| <span class="hljs-meta"> @property</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">description</span>(<span class="hljs-params">self</span>): | |
| <span class="hljs-keyword">return</span> <span class="hljs-string">"I'm a block used inside the `LoopWrapper` class"</span> | |
| <span class="hljs-keyword">def</span> <span class="hljs-title function_">__call__</span>(<span class="hljs-params">self, components, block_state, i: <span class="hljs-built_in">int</span></span>): | |
| block_state.x += <span class="hljs-number">1</span> | |
| <span class="hljs-keyword">return</span> components, block_state<!-- HTML_TAG_END --></pre></div> <h2 class="relative group"><a id="loopsequentialpipelineblocks" 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="#loopsequentialpipelineblocks"><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>LoopSequentialPipelineBlocks</span></h2> <p data-svelte-h="svelte-1cajvmn">Use the <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.modular_pipelines.LoopSequentialPipelineBlocks.from_blocks_dict">from_blocks_dict()</a> method to add the loop block to the loop wrapper to create <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.modular_pipelines.LoopSequentialPipelineBlocks">LoopSequentialPipelineBlocks</a>.</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=""><!-- HTML_TAG_START -->loop = LoopWrapper.from_blocks_dict({<span class="hljs-string">"block1"</span>: LoopBlock})<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-iz7adx">Add more loop blocks to run within each iteration with <a href="/docs/diffusers/pr_12448/en/api/modular_diffusers/pipeline_blocks#diffusers.modular_pipelines.LoopSequentialPipelineBlocks.from_blocks_dict">from_blocks_dict()</a>. This allows you to modify the blocks without changing the loop logic itself.</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=""><!-- HTML_TAG_START -->loop = LoopWrapper.from_blocks_dict({<span class="hljs-string">"block1"</span>: LoopBlock(), <span class="hljs-string">"block2"</span>: LoopBlock})<!-- HTML_TAG_END --></pre></div> <a class="!text-gray-400 !no-underline text-sm flex items-center not-prose mt-4" href="https://github.com/huggingface/diffusers/blob/main/docs/source/en/modular_diffusers/loop_sequential_pipeline_blocks.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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