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<link href="/docs/diffusers/main/en/_app/immutable/assets/0.tn0RQdqM.css" rel="modulepreload"> <!--[--><!--[0--><!--[--><!--[0--><!--[--><p></p> <div class="items-center shrink-0 min-w-[100px] max-sm:min-w-[50px] justify-end ml-auto flex" style="float: inline-end; margin-inline-start: 10px; display: inline-flex; position: relative; z-index: 10;"><div dir="ltr" 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 dir="auto">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> <!--[-1--><!--]--></div><!----> <!--[0--><h1 class="relative group"><a id="schedulers" 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="#schedulers"><span><svg 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><!---->Trình lập lịch<!----></span></h1><!--]--><!----> <p>Trình lập lịch (scheduler) chỉ cho vòng lặp khử nhiễu biết phải loại bỏ bao nhiêu nhiễu ở mỗi bước. Các trình lập lịch khác nhau đánh đổi tốc độ lấy chất lượng.</p> <p>Hướng dẫn này cho thấy cách tải một scheduler và tùy chỉnh lịch trình bước thời gian (timestep), khoảng cách và sigmas của nó.</p> <!--[1--><h2 class="relative group"><a id="choosing-a-scheduler" 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="#choosing-a-scheduler"><span><svg 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><!---->Chọn trình lập lịch<!----></span></h2><!--]--><!----> <p>Bắt đầu từ checkpoint mặc định. Chỉ thay thế nếu bạn cần một sự đánh đổi khác về tốc độ hoặc chất lượng.</p> <ul><li>DPM++ 2M SDE Karras là một lựa chọn đa năng mạnh mẽ cho nhiều checkpoint của mô hình khuếch tán tiềm ẩn.</li> <li><a href="/docs/diffusers/main/vi/api/schedulers/tcd#diffusers.TCDScheduler">TCDScheduler</a> hoạt động tốt với các mô hình đã được chưng cất.</li> <li>Sử dụng <a href="/docs/diffusers/main/vi/api/schedulers/flow_match_euler_discrete#diffusers.FlowMatchEulerDiscreteScheduler">FlowMatchEulerDiscreteScheduler</a> hoặc <a href="/docs/diffusers/main/vi/api/schedulers/flow_match_heun_discrete#diffusers.FlowMatchHeunDiscreteScheduler">FlowMatchHeunDiscreteScheduler</a> cho các mô hình FlowMatch (Qwen-Image, Flux và các mô hình tương tự).</li> <li><a href="/docs/diffusers/main/vi/api/schedulers/euler#diffusers.EulerDiscreteScheduler">EulerDiscreteScheduler</a> hoặc <a href="/docs/diffusers/main/vi/api/schedulers/euler_ancestral#diffusers.EulerAncestralDiscreteScheduler">EulerAncestralDiscreteScheduler</a> thường hoạt động tốt cho các hình ảnh theo phong cách anime.</li> <li><a href="/docs/diffusers/main/vi/api/schedulers/lcm#diffusers.LCMScheduler">LCMScheduler</a> với LCM UNet hoặc LoRA để tạo ảnh trong vài bước khi checkpoint hỗ trợ.</li></ul> <!--[1--><h2 class="relative group"><a id="loading-schedulers" 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="#loading-schedulers"><span><svg 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><!---->Tải trình lập lịch<!----></span></h2><!--]--><!----> <blockquote class="tip"><p>Các mô hình flow-matching như Qwen-Image và Flux sử dụng <a href="/docs/diffusers/main/vi/api/schedulers/flow_match_euler_discrete#diffusers.FlowMatchEulerDiscreteScheduler">FlowMatchEulerDiscreteScheduler</a> làm mặc định. Hãy giữ nguyên scheduler này trừ khi bạn chủ ý thử nghiệm. Chỉ thay thế bằng <a href="/docs/diffusers/main/vi/api/configuration#diffusers.ConfigMixin.from_config">from_config()</a> khi phiên bản thay thế tương thích với checkpoint.</p></blockquote> <p>Schedulers chỉ bao gồm cấu hình và không đi kèm các tensor trọng số. Truy cập thuộc tính <code>.scheduler</code> trên một pipeline để kiểm tra cấu hình đã được nạp.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">import</span> torch
<span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DiffusionPipeline
pipeline = DiffusionPipeline.from_pretrained(
<span class="hljs-string">&quot;stabilityai/stable-diffusion-xl-base-1.0&quot;</span>, dtype=torch.float16, device_map=<span class="hljs-string">&quot;cuda&quot;</span> <span class="hljs-comment"># or &quot;mps&quot;, &quot;xpu&quot;, &quot;cpu&quot;</span>
)
pipeline.scheduler<!----></pre></div><!----> <p>Để thay đổi scheduler trên một pipeline đã được nạp, hãy sử dụng <a href="/docs/diffusers/main/vi/api/configuration#diffusers.ConfigMixin.from_config">from_config()</a> với cấu hình scheduler hiện có để <code>num_train_timesteps</code> và các trường liên quan vẫn được đồng bộ. Đối với các checkpoint FlowMatch (Qwen-Image, Flux và tương tự), hãy giữ nguyên <a href="/docs/diffusers/main/vi/api/schedulers/flow_match_euler_discrete#diffusers.FlowMatchEulerDiscreteScheduler">FlowMatchEulerDiscreteScheduler</a> trừ khi bạn chủ ý thử nghiệm với một phương án thay thế tương thích.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DPMSolverMultistepScheduler
pipeline.scheduler = DPMSolverMultistepScheduler.from_config(pipeline.scheduler.config)<!----></pre></div><!----> <p>Bạn cũng có thể tải cấu hình scheduler từ Hub bằng <a href="/docs/diffusers/main/vi/api/schedulers/overview#diffusers.SchedulerMixin.from_pretrained">from_pretrained()</a> và truyền nó vào <a href="/docs/diffusers/main/vi/api/pipelines/overview#diffusers.DiffusionPipeline.from_pretrained">from_pretrained()</a> thông qua <code>scheduler</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DiffusionPipeline, DPMSolverMultistepScheduler
dpm = DPMSolverMultistepScheduler.from_pretrained(
<span class="hljs-string">&quot;stabilityai/stable-diffusion-xl-base-1.0&quot;</span>, subfolder=<span class="hljs-string">&quot;scheduler&quot;</span>
)
pipeline = DiffusionPipeline.from_pretrained(
<span class="hljs-string">&quot;stabilityai/stable-diffusion-xl-base-1.0&quot;</span>,
scheduler=dpm,
dtype=torch.float16,
device_map=<span class="hljs-string">&quot;cuda&quot;</span>, <span class="hljs-comment"># or &quot;mps&quot;, &quot;xpu&quot;, &quot;cpu&quot;</span>
)
pipeline.scheduler<!----></pre></div><!----> <!--[1--><h2 class="relative group"><a id="timestep-schedules" 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="#timestep-schedules"><span><svg 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><!---->Lịch trình bước thời gian<!----></span></h2><!--]--><!----> <p>Timestep hoặc lịch trình nhiễu quyết định cách nhiễu được phân bố trong quá trình khử nhiễu. Lịch trình có thể là tuyến tính hoặc tập trung nhiều hơn vào phần đầu hoặc phần cuối. Đây là một chuỗi các mức nhiễu được tính toán trước, sinh ra từ cấu hình mặc định của trình lập lịch, nhưng có thể được tùy chỉnh để sử dụng các lịch trình khác.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-text "><!---->linear (even steps) AYS (denser where it matters)
noise noise
^ ^
| * | *
| * | *
| * | **
| * | ***
| * | **
| * | *
| * | *
+-----------------&gt; step +-----------------&gt; step<!----></pre></div><!----> <blockquote class="tip"><p><code>timesteps</code> tùy chỉnh chỉ hoạt động nếu <code>set_timesteps</code> của scheduler đó chấp nhận tham số này (các pipeline kiểm tra chữ ký thông qua <code>retrieve_timesteps</code> và sẽ ném <code>ValueError</code> nếu không). Hãy kiểm tra trang API của scheduler hoặc chữ ký của <code>set_timesteps</code> trước khi truyền chúng.</p></blockquote> <p>Ví dụ bên dưới sử dụng lịch trình <a href="https://research.nvidia.com/labs/toronto-ai/AlignYourSteps/" rel="nofollow">Align Your Steps (AYS)</a>, có thể tạo ra hình ảnh chất lượng cao chỉ trong 10 bước, giúp tăng tốc đáng kể quá trình tạo hình ảnh và giảm thời gian tính toán.</p> <p>Nhập lịch trình và truyền nó vào tham số <code>timesteps</code> trong pipeline.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">import</span> torch
<span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DiffusionPipeline, DPMSolverMultistepScheduler
<span class="hljs-keyword">from</span> diffusers.schedulers <span class="hljs-keyword">import</span> AysSchedules
sampling_schedule = AysSchedules[<span class="hljs-string">&quot;StableDiffusionXLTimesteps&quot;</span>]
<span class="hljs-built_in">print</span>(sampling_schedule)
<span class="hljs-comment"># [999, 845, 730, 587, 443, 310, 193, 116, 53, 13]</span>
pipeline = DiffusionPipeline.from_pretrained(
<span class="hljs-string">&quot;SG161222/RealVisXL_V4.0&quot;</span>,
dtype=torch.float16,
device_map=<span class="hljs-string">&quot;cuda&quot;</span> <span class="hljs-comment"># or &quot;mps&quot;, &quot;xpu&quot;, &quot;cpu&quot;</span>
)
pipeline.scheduler = DPMSolverMultistepScheduler.from_config(
pipeline.scheduler.config, algorithm_type=<span class="hljs-string">&quot;sde-dpmsolver++&quot;</span>
)
prompt = <span class="hljs-string">&quot;A cinematic shot of a cute little rabbit wearing a jacket and doing a thumbs up&quot;</span>
image = pipeline(
prompt=prompt,
negative_prompt=<span class="hljs-string">&quot;&quot;</span>,
timesteps=sampling_schedule,
).images[<span class="hljs-number">0</span>]<!----></pre></div><!----> <div class="flex gap-4"><div><img class="rounded-xl" src="https://huggingface.co/datasets/YiYiXu/testing-images/resolve/main/ays.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">Lịch trình bước thời gian AYS 10 bước</figcaption></div> <div><img class="rounded-xl" src="https://huggingface.co/datasets/YiYiXu/testing-images/resolve/main/10.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">Lịch trình bước thời gian phân bố tuyến tính 10 bước</figcaption></div> <div><img class="rounded-xl" src="https://huggingface.co/datasets/YiYiXu/testing-images/resolve/main/25.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">Lịch trình bước thời gian phân bố tuyến tính 25 bước</figcaption></div></div> <p>Đối với việc rescaling v-prediction/zero-SNR trên các checkpoint cũ hơn, xem <a href="./legacy_checkpoints#rescaling-schedules">Legacy checkpoints</a>.</p> <!--[1--><h2 class="relative group"><a id="timestep-spacing" 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="#timestep-spacing"><span><svg 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><!---->Khoảng cách bước thời gian<!----></span></h2><!--]--><!----> <p>Khoảng cách bước thời gian (timestep) đề cập đến các bước cụ thể <em>t</em> để lấy mẫu từ lịch trình. Diffusers cung cấp ba loại khoảng cách như được hiển thị bên dưới.</p> <table><thead><tr><th>chiến lược khoảng cách</th><th>tính toán khoảng cách</th><th>các bước thời gian (timesteps) mẫu</th></tr></thead><tbody><tr><td><code>leading</code></td><td>các bước cách đều</td><td><code>[900, 800, 700, ..., 100, 0]</code></td></tr><tr><td><code>linspace</code></td><td>bao gồm bước đầu tiên và bước cuối cùng, sau đó chia đều các bước trung gian còn lại</td><td><code>[1000, 888.89, 777.78, ..., 111.11, 0]</code></td></tr><tr><td><code>trailing</code></td><td>bao gồm bước cuối cùng và chia đều các bước trung gian còn lại bắt đầu từ cuối</td><td><code>[999, 899, 799, 699, 599, 499, 399, 299, 199, 99]</code></td></tr></tbody></table> <p>Truyền chiến lược khoảng cách vào tham số <code>timestep_spacing</code> trong trình lập lịch.</p> <blockquote class="tip"><p>Chiến lược <code>trailing</code> thường tạo ra các hình ảnh có chất lượng cao hơn với nhiều chi tiết hơn trong số bước ít hơn, nhưng sự khác biệt về chất lượng không rõ ràng bằng đối với các giá trị bước tiêu chuẩn hơn.</p></blockquote> <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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">import</span> torch
<span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DiffusionPipeline, DPMSolverMultistepScheduler
pipeline = DiffusionPipeline.from_pretrained(
<span class="hljs-string">&quot;SG161222/RealVisXL_V4.0&quot;</span>,
dtype=torch.float16,
device_map=<span class="hljs-string">&quot;cuda&quot;</span> <span class="hljs-comment"># or &quot;mps&quot;, &quot;xpu&quot;, &quot;cpu&quot;</span>
)
pipeline.scheduler = DPMSolverMultistepScheduler.from_config(
pipeline.scheduler.config, timestep_spacing=<span class="hljs-string">&quot;trailing&quot;</span>
)
prompt = <span class="hljs-string">&quot;A cinematic shot of a cute little black cat sitting on a pumpkin at night&quot;</span>
image = pipeline(
prompt=prompt,
negative_prompt=<span class="hljs-string">&quot;&quot;</span>,
num_inference_steps=<span class="hljs-number">5</span>,
).images[<span class="hljs-number">0</span>]
image<!----></pre></div><!----> <div class="flex gap-4"><div><img class="rounded-xl" src="https://huggingface.co/datasets/stevhliu/testing-images/resolve/main/trailing_spacing.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">khoảng cách phía sau sau 5 bước</figcaption></div> <div><img class="rounded-xl" src="https://huggingface.co/datasets/stevhliu/testing-images/resolve/main/leading_spacing.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">khoảng cách phía trước sau 5 bước</figcaption></div></div> <!--[1--><h2 class="relative group"><a id="sigmas" 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="#sigmas"><span><svg 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><!---->Sigmas<!----></span></h2><!--]--><!----> <p>Sigmas là thước đo mức độ nhiễu của một mẫu tại một bước nhất định theo như lịch trình đã định. Khi sử dụng <code>sigmas</code> tùy chỉnh, các <code>timesteps</code> sẽ được tính từ các giá trị này thay vì cấu hình trình lập lịch mặc định.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-text "><!---->step: 0 1 2 3 4
sigma: σ0 &gt; σ1 &gt; σ2 &gt; σ3 &gt; σ4 ≈ 0
high noise ---&gt; clean sample<!----></pre></div><!----> <blockquote class="tip"><p><code>sigmas</code> tùy chỉnh chỉ hoạt động nếu <code>set_timesteps</code> của trình lập lịch đó chấp nhận tham số này (các pipeline kiểm tra chữ ký thông qua <code>retrieve_timesteps</code> và sẽ ném <code>ValueError</code> nếu không). Hãy kiểm tra trang API của trình lập lịch hoặc chữ ký của <code>set_timesteps</code> trước khi truyền chúng.</p></blockquote> <p>Truyền các sigmas tùy chỉnh vào tham số <code>sigmas</code> trong pipeline. Ví dụ bên dưới sử dụng <a href="https://github.com/huggingface/diffusers/blob/main/src/diffusers/schedulers/scheduling_utils.py" rel="nofollow">sigmas</a> từ lịch AYS 10 bước.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">import</span> torch
<span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DiffusionPipeline, EulerDiscreteScheduler
<span class="hljs-keyword">from</span> diffusers.schedulers <span class="hljs-keyword">import</span> AysSchedules
pipeline = DiffusionPipeline.from_pretrained(
<span class="hljs-string">&quot;SG161222/RealVisXL_V4.0&quot;</span>,
dtype=torch.float16,
device_map=<span class="hljs-string">&quot;cuda&quot;</span>, <span class="hljs-comment"># or &quot;mps&quot;, &quot;xpu&quot;, &quot;cpu&quot;</span>
)
pipeline.scheduler = EulerDiscreteScheduler.from_config(pipeline.scheduler.config)
sigmas = AysSchedules[<span class="hljs-string">&quot;StableDiffusionXLSigmas&quot;</span>]
prompt = <span class="hljs-string">&quot;A cinematic shot of a cute little rabbit wearing a jacket and doing a thumbs up&quot;</span>
image = pipeline(
prompt=prompt,
negative_prompt=<span class="hljs-string">&quot;&quot;</span>,
sigmas=sigmas,
).images[<span class="hljs-number">0</span>]<!----></pre></div><!----> <!--[2--><h3 class="relative group"><a id="karras-sigmas" 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="#karras-sigmas"><span><svg 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><!---->Karras sigmas<!----></span></h3><!--]--><!----> <p><a href="https://huggingface.co/papers/2206.00364" rel="nofollow">Karras sigmas</a> lấy lại mẫu cho lịch trình nhiễu để lấy mẫu hiệu quả hơn bằng cách nhóm các sigma dày đặc hơn ở giữa chuỗi, nơi việc tái tạo cấu trúc là quan trọng, trong khi sử dụng ít sigma hơn ở đầu và cuối, nơi sự thay đổi của nhiễu có ít tác động hơn. Điều này có thể tăng mức độ chi tiết trong một hình ảnh được tạo ra.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-text "><!---->default σ: * * * * * * * * even-ish
Karras σ: * * * * * * * denser mid, sparser ends
|---structure---|<!----></pre></div><!----> <p>Đặt <code>use_karras_sigmas=True</code> trong trình lập lịch để bật tính năng này.</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 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> Đã sao chép</div><!----></button><!----></div> <pre class="language-py "><!----><span class="hljs-keyword">import</span> torch
<span class="hljs-keyword">from</span> diffusers <span class="hljs-keyword">import</span> DiffusionPipeline, DPMSolverMultistepScheduler
pipeline = DiffusionPipeline.from_pretrained(
<span class="hljs-string">&quot;SG161222/RealVisXL_V4.0&quot;</span>,
dtype=torch.float16,
device_map=<span class="hljs-string">&quot;cuda&quot;</span> <span class="hljs-comment"># or &quot;mps&quot;, &quot;xpu&quot;, &quot;cpu&quot;</span>
)
pipeline.scheduler = DPMSolverMultistepScheduler.from_config(
pipeline.scheduler.config,
algorithm_type=<span class="hljs-string">&quot;sde-dpmsolver++&quot;</span>,
use_karras_sigmas=<span class="hljs-literal">True</span>,
)
prompt = <span class="hljs-string">&quot;A cinematic shot of a cute little rabbit wearing a jacket and doing a thumbs up&quot;</span>
image = pipeline(
prompt=prompt,
negative_prompt=<span class="hljs-string">&quot;&quot;</span>,
num_inference_steps=<span class="hljs-number">20</span>,
).images[<span class="hljs-number">0</span>]<!----></pre></div><!----> <div class="flex gap-4"><div><img class="rounded-xl" src="https://huggingface.co/datasets/stevhliu/testing-images/resolve/main/karras_sigmas_true.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">Bật sigmas Karras</figcaption></div> <div><img class="rounded-xl" src="https://huggingface.co/datasets/stevhliu/testing-images/resolve/main/karras_sigmas_false.png"/> <figcaption class="mt-2 text-center text-sm text-gray-500">Karras sigmas đã bị vô hiệu hóa</figcaption></div></div> <p>Tham khảo <a href="../api/schedulers/overview">tổng quan</a> API scheduler để xem danh sách các scheduler hỗ trợ Karras sigmas. Chỉ nên sử dụng cho các mô hình được huấn luyện với Karras sigmas.</p> <!--[1--><h2 class="relative group"><a id="next-steps" 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="#next-steps"><span><svg 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><!---->Các bước tiếp theo<!----></span></h2><!--]--><!----> <ul><li>Đọc bài báo <a href="https://huggingface.co/papers/2305.08891" rel="nofollow">Common Diffusion Noise Schedules and Sample Steps are Flawed</a> để biết thêm chi tiết về việc rescale noise schedule nhằm đảm bảo zero SNR.</li></ul> <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/using-diffusers/schedulers.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><span class="underline">Update</span> on GitHub</span></a><!----> <p></p><!--]--><!----><!--]--><!--]--><!--]--> <!--[-1--><!--]--><!--]-->
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