add flax pipelines to api doc + doc string examples (#2600)

* add api doc for flax pipeline + doc string examples

* make style

---------
Co-authored-by: yiyixuxu <yixu@yis-macbook-pro.lan>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

docs/source/en/api/pipelines/stable_diffusion/img2img.mdx

@@ -30,3 +30,7 @@ proposed by Chenlin Meng, Yutong He, Yang Song, Jiaming Song, Jiajun Wu, Jun-Yan
 	- disable_attention_slicing
 	- enable_xformers_memory_efficient_attention
 	- disable_xformers_memory_efficient_attention
+
+[[autodoc]] FlaxStableDiffusionImg2ImgPipeline
+	- all
+	- __call__
\ No newline at end of file

docs/source/en/api/pipelines/stable_diffusion/inpaint.mdx

@@ -31,3 +31,7 @@ Available checkpoints are:
 	- disable_attention_slicing
 	- enable_xformers_memory_efficient_attention
 	- disable_xformers_memory_efficient_attention
+
+[[autodoc]] FlaxStableDiffusionInpaintPipeline
+	- all
+	- __call__
\ No newline at end of file

docs/source/en/api/pipelines/stable_diffusion/text2img.mdx

@@ -39,3 +39,7 @@ Available Checkpoints are:
 	- disable_xformers_memory_efficient_attention
 	- enable_vae_tiling
 	- disable_vae_tiling
+
+[[autodoc]] FlaxStableDiffusionPipeline
+	- all
+	- __call__

src/diffusers/pipelines/stable_diffusion/pipeline_flax_stable_diffusion.py

@@ -24,6 +24,7 @@ from flax.jax_utils import unreplicate
 from flax.training.common_utils import shard
 from packaging import version
 from PIL import Image
+
 from transformers import CLIPFeatureExtractor, CLIPTokenizer, FlaxCLIPTextModel
 
 from ...models import FlaxAutoencoderKL, FlaxUNet2DConditionModel
@@ -33,7 +34,7 @@ from ...schedulers import (
     FlaxLMSDiscreteScheduler,
     FlaxPNDMScheduler,
 )
-from ...utils import deprecate, logging
+from ...utils import deprecate, logging, replace_example_docstring
 from ..pipeline_flax_utils import FlaxDiffusionPipeline
 from . import FlaxStableDiffusionPipelineOutput
 from .safety_checker_flax import FlaxStableDiffusionSafetyChecker
@@ -44,6 +45,39 @@ logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
 # Set to True to use python for loop instead of jax.fori_loop for easier debugging
 DEBUG = False
 
+EXAMPLE_DOC_STRING = """
+    Examples:
+        ```py
+        >>> import jax
+        >>> import numpy as np
+        >>> from flax.jax_utils import replicate
+        >>> from flax.training.common_utils import shard
+
+        >>> from diffusers import FlaxStableDiffusionPipeline
+
+        >>> pipeline, params = FlaxStableDiffusionPipeline.from_pretrained(
+        ...     "runwayml/stable-diffusion-v1-5", revision="bf16", dtype=jax.numpy.bfloat16
+        ... )
+
+        >>> prompt = "a photo of an astronaut riding a horse on mars"
+
+        >>> prng_seed = jax.random.PRNGKey(0)
+        >>> num_inference_steps = 50
+
+        >>> num_samples = jax.device_count()
+        >>> prompt = num_samples * [prompt]
+        >>> prompt_ids = pipeline.prepare_inputs(prompt)
+        # shard inputs and rng
+
+        >>> params = replicate(params)
+        >>> prng_seed = jax.random.split(prng_seed, jax.device_count())
+        >>> prompt_ids = shard(prompt_ids)
+
+        >>> images = pipeline(prompt_ids, params, prng_seed, num_inference_steps, jit=True).images
+        >>> images = pipeline.numpy_to_pil(np.asarray(images.reshape((num_samples,) + images.shape[-3:])))
+        ```
+"""
+
 
 class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
     r"""
@@ -272,6 +306,7 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
         image = (image / 2 + 0.5).clip(0, 1).transpose(0, 2, 3, 1)
         return image
 
+    @replace_example_docstring(EXAMPLE_DOC_STRING)
     def __call__(
         self,
         prompt_ids: jnp.array,
@@ -316,6 +351,8 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
                 Whether or not to return a [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] instead of
                 a plain tuple.
 
+        Examples:
+
         Returns:
             [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] or `tuple`:
             [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a

src/diffusers/pipelines/stable_diffusion/pipeline_flax_stable_diffusion_img2img.py

@@ -23,6 +23,7 @@ from flax.core.frozen_dict import FrozenDict
 from flax.jax_utils import unreplicate
 from flax.training.common_utils import shard
 from PIL import Image
+
 from transformers import CLIPFeatureExtractor, CLIPTokenizer, FlaxCLIPTextModel
 
 from ...models import FlaxAutoencoderKL, FlaxUNet2DConditionModel
@@ -32,7 +33,7 @@ from ...schedulers import (
     FlaxLMSDiscreteScheduler,
     FlaxPNDMScheduler,
 )
-from ...utils import PIL_INTERPOLATION, logging
+from ...utils import PIL_INTERPOLATION, logging, replace_example_docstring
 from ..pipeline_flax_utils import FlaxDiffusionPipeline
 from . import FlaxStableDiffusionPipelineOutput
 from .safety_checker_flax import FlaxStableDiffusionSafetyChecker
@@ -43,6 +44,64 @@ logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
 # Set to True to use python for loop instead of jax.fori_loop for easier debugging
 DEBUG = False
 
+EXAMPLE_DOC_STRING = """
+    Examples:
+        ```py
+        >>> import jax
+        >>> import numpy as np
+        >>> import jax.numpy as jnp
+        >>> from flax.jax_utils import replicate
+        >>> from flax.training.common_utils import shard
+        >>> import requests
+        >>> from io import BytesIO
+        >>> from PIL import Image
+        >>> from diffusers import FlaxStableDiffusionImg2ImgPipeline
+
+
+        >>> def create_key(seed=0):
+        ...     return jax.random.PRNGKey(seed)
+
+
+        >>> rng = create_key(0)
+
+        >>> url = "https://raw.githubusercontent.com/CompVis/stable-diffusion/main/assets/stable-samples/img2img/sketch-mountains-input.jpg"
+        >>> response = requests.get(url)
+        >>> init_img = Image.open(BytesIO(response.content)).convert("RGB")
+        >>> init_img = init_img.resize((768, 512))
+
+        >>> prompts = "A fantasy landscape, trending on artstation"
+
+        >>> pipeline, params = FlaxStableDiffusionImg2ImgPipeline.from_pretrained(
+        ...     "CompVis/stable-diffusion-v1-4",
+        ...     revision="flax",
+        ...     dtype=jnp.bfloat16,
+        ... )
+
+        >>> num_samples = jax.device_count()
+        >>> rng = jax.random.split(rng, jax.device_count())
+        >>> prompt_ids, processed_image = pipeline.prepare_inputs(
+        ...     prompt=[prompts] * num_samples, image=[init_img] * num_samples
+        ... )
+        >>> p_params = replicate(params)
+        >>> prompt_ids = shard(prompt_ids)
+        >>> processed_image = shard(processed_image)
+
+        >>> output = pipeline(
+        ...     prompt_ids=prompt_ids,
+        ...     image=processed_image,
+        ...     params=p_params,
+        ...     prng_seed=rng,
+        ...     strength=0.75,
+        ...     num_inference_steps=50,
+        ...     jit=True,
+        ...     height=512,
+        ...     width=768,
+        ... ).images
+
+        >>> output_images = pipeline.numpy_to_pil(np.asarray(output.reshape((num_samples,) + output.shape[-3:])))
+        ```
+"""
+
 
 class FlaxStableDiffusionImg2ImgPipeline(FlaxDiffusionPipeline):
     r"""
@@ -277,6 +336,7 @@ class FlaxStableDiffusionImg2ImgPipeline(FlaxDiffusionPipeline):
         image = (image / 2 + 0.5).clip(0, 1).transpose(0, 2, 3, 1)
         return image
 
+    @replace_example_docstring(EXAMPLE_DOC_STRING)
     def __call__(
         self,
         prompt_ids: jnp.array,
@@ -332,6 +392,8 @@ class FlaxStableDiffusionImg2ImgPipeline(FlaxDiffusionPipeline):
                 Whether to run `pmap` versions of the generation and safety scoring functions. NOTE: This argument
                 exists because `__call__` is not yet end-to-end pmap-able. It will be removed in a future release.
 
+        Examples:
+
         Returns:
             [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] or `tuple`:
             [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a

src/diffusers/pipelines/stable_diffusion/pipeline_flax_stable_diffusion_inpaint.py

@@ -24,6 +24,7 @@ from flax.jax_utils import unreplicate
 from flax.training.common_utils import shard
 from packaging import version
 from PIL import Image
+
 from transformers import CLIPFeatureExtractor, CLIPTokenizer, FlaxCLIPTextModel
 
 from ...models import FlaxAutoencoderKL, FlaxUNet2DConditionModel
@@ -33,7 +34,7 @@ from ...schedulers import (
     FlaxLMSDiscreteScheduler,
     FlaxPNDMScheduler,
 )
-from ...utils import PIL_INTERPOLATION, deprecate, logging
+from ...utils import PIL_INTERPOLATION, deprecate, logging, replace_example_docstring
 from ..pipeline_flax_utils import FlaxDiffusionPipeline
 from . import FlaxStableDiffusionPipelineOutput
 from .safety_checker_flax import FlaxStableDiffusionSafetyChecker
@@ -44,6 +45,60 @@ logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
 # Set to True to use python for loop instead of jax.fori_loop for easier debugging
 DEBUG = False
 
+EXAMPLE_DOC_STRING = """
+    Examples:
+        ```py
+        >>> import jax
+        >>> import numpy as np
+        >>> from flax.jax_utils import replicate
+        >>> from flax.training.common_utils import shard
+        >>> import PIL
+        >>> import requests
+        >>> from io import BytesIO
+        >>> from diffusers import FlaxStableDiffusionInpaintPipeline
+
+
+        >>> def download_image(url):
+        ...     response = requests.get(url)
+        ...     return PIL.Image.open(BytesIO(response.content)).convert("RGB")
+
+
+        >>> img_url = "https://raw.githubusercontent.com/CompVis/latent-diffusion/main/data/inpainting_examples/overture-creations-5sI6fQgYIuo.png"
+        >>> mask_url = "https://raw.githubusercontent.com/CompVis/latent-diffusion/main/data/inpainting_examples/overture-creations-5sI6fQgYIuo_mask.png"
+
+        >>> init_image = download_image(img_url).resize((512, 512))
+        >>> mask_image = download_image(mask_url).resize((512, 512))
+
+        >>> pipeline, params = FlaxStableDiffusionInpaintPipeline.from_pretrained(
+        ...     "xvjiarui/stable-diffusion-2-inpainting"
+        ... )
+
+        >>> prompt = "Face of a yellow cat, high resolution, sitting on a park bench"
+        >>> prng_seed = jax.random.PRNGKey(0)
+        >>> num_inference_steps = 50
+
+        >>> num_samples = jax.device_count()
+        >>> prompt = num_samples * [prompt]
+        >>> init_image = num_samples * [init_image]
+        >>> mask_image = num_samples * [mask_image]
+        >>> prompt_ids, processed_masked_images, processed_masks = pipeline.prepare_inputs(
+        ...     prompt, init_image, mask_image
+        ... )
+        # shard inputs and rng
+
+        >>> params = replicate(params)
+        >>> prng_seed = jax.random.split(prng_seed, jax.device_count())
+        >>> prompt_ids = shard(prompt_ids)
+        >>> processed_masked_images = shard(processed_masked_images)
+        >>> processed_masks = shard(processed_masks)
+
+        >>> images = pipeline(
+        ...     prompt_ids, processed_masks, processed_masked_images, params, prng_seed, num_inference_steps, jit=True
+        ... ).images
+        >>> images = pipeline.numpy_to_pil(np.asarray(images.reshape((num_samples,) + images.shape[-3:])))
+        ```
+"""
+
 
 class FlaxStableDiffusionInpaintPipeline(FlaxDiffusionPipeline):
     r"""
@@ -332,6 +387,7 @@ class FlaxStableDiffusionInpaintPipeline(FlaxDiffusionPipeline):
         image = (image / 2 + 0.5).clip(0, 1).transpose(0, 2, 3, 1)
         return image
 
+    @replace_example_docstring(EXAMPLE_DOC_STRING)
     def __call__(
         self,
         prompt_ids: jnp.array,
@@ -378,6 +434,8 @@ class FlaxStableDiffusionInpaintPipeline(FlaxDiffusionPipeline):
                 Whether or not to return a [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] instead of
                 a plain tuple.
 
+        Examples:
+
         Returns:
             [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] or `tuple`:
                 [`~pipelines.stable_diffusion.FlaxStableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a