update

src/diffusers/pipelines/mochi/pipeline_mochi.py

@@ -104,6 +104,7 @@ def retrieve_timesteps(
     Calls the scheduler's `set_timesteps` method and retrieves timesteps from the scheduler after the call. Handles
 
     custom timesteps. Any kwargs will be supplied to `scheduler.set_timesteps`.
+
     Args:
         scheduler (`SchedulerMixin`):
             The scheduler to get timesteps from.
@@ -272,8 +273,7 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
         prompt_embeds: Optional[torch.FloatTensor] = None,
         negative_prompt_embeds: Optional[torch.FloatTensor] = None,
         max_sequence_length: int = 512,
-        do_classifier_free_guidance=True,
-        lora_scale: Optional[float] = None,
+        do_classifier_free_guidance: bool = True,
     ):
         r"""
 
@@ -305,14 +305,12 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
                 device=device,
             )
 
-        dtype = self.text_encoder.dtype if self.text_encoder is not None else self.transformer.dtype
+        prompt_embeds = prompt_embeds.to(self.text_encoder.dtype)
 
-        # TODO: Add negative prompts back
         if do_classifier_free_guidance and negative_prompt_embeds is None:
             negative_prompt = negative_prompt or ""
             # normalize str to list
             negative_prompt = batch_size * [negative_prompt] if isinstance(negative_prompt, str) else negative_prompt
-            )
 
             if prompt is not None and type(prompt) is not type(negative_prompt):
                 raise TypeError(
@@ -332,6 +330,7 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
                 max_sequence_length=max_sequence_length,
                 device=device,
             )
+            negative_prompt_embeds = negative_prompt_embeds.to(self.text_encoder.dtype)
 
         return prompt_embeds, negative_prompt_embeds
 
@@ -532,9 +531,9 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
         Examples:
 
         Returns:
-            [`~pipelines.mochi.MochiPipelineOutput`] or `tuple`: [`~pipelines.flux.FluxPipelineOutput`] if `return_dict`
-            is True, otherwise a `tuple`. When returning a tuple, the first element is a list with the generated
-            images.
+            [`~pipelines.mochi.MochiPipelineOutput`] or `tuple`: [`~pipelines.flux.FluxPipelineOutput`] if
+            `return_dict` is True, otherwise a `tuple`. When returning a tuple, the first element is a list with the
+            generated images.
         """
         height = height or self.default_height
         width = width or self.default_width
@@ -595,21 +594,12 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
         threshold_noise = 0.025
         sigmas = linear_quadratic_schedule(num_inference_steps, threshold_noise)
 
-        image_seq_len = latents.shape[1]
-        mu = calculate_shift(
-            image_seq_len,
-            self.scheduler.config.base_image_seq_len,
-            self.scheduler.config.max_image_seq_len,
-            self.scheduler.config.base_shift,
-            self.scheduler.config.max_shift,
-        )
         timesteps, num_inference_steps = retrieve_timesteps(
             self.scheduler,
             num_inference_steps,
             device,
             timesteps,
             sigmas,
-            mu=mu,
         )
         num_warmup_steps = max(len(timesteps) - num_inference_steps * self.scheduler.order, 0)
         self._num_timesteps = len(timesteps)
@@ -628,12 +618,16 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
 
                 noise_pred = self.transformer(
                     hidden_states=latent_model_input,
-                    timestep=timestep,
+                    timestep=timestep / 1000,
                     encoder_hidden_states=prompt_embeds,
                     joint_attention_kwargs=self.joint_attention_kwargs,
                     return_dict=False,
                 )[0]
 
+                if self.do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + self.guidance_scale * (noise_pred_text - noise_pred_uncond)
+
                 # compute the previous noisy sample x_t -> x_t-1
                 latents_dtype = latents.dtype
                 latents = self.scheduler.step(noise_pred, t, latents, return_dict=False)[0]
@@ -660,18 +654,16 @@ class MochiPipeline(DiffusionPipeline, TextualInversionLoaderMixin):
                     xm.mark_step()
 
         if output_type == "latent":
-            image = latents
+            video = latents
 
         else:
-            latents = self._unpack_latents(latents, height, width, self.vae_scale_factor)
-            latents = (latents / self.vae.config.scaling_factor) + self.vae.config.shift_factor
-            image = self.vae.decode(latents, return_dict=False)[0]
-            image = self.image_processor.postprocess(image, output_type=output_type)
+            video = self.vae.decode(latents, return_dict=False)[0]
+            video = self.video_processor.postprocess(video, output_type=output_type)
 
         # Offload all models
         self.maybe_free_model_hooks()
 
         if not return_dict:
-            return (image,)
+            return (video,)
 
-        return MochiPipelineOutput(images=image)
+        return MochiPipelineOutput(frames=video)