feat: add web ui for core ml stable diffusion (#56)

Author: soulteary

README.md

@@ -220,6 +220,51 @@ Differences may be less or more pronounced for different inputs. Please see the
 
 </details>
 
+
+## <a name="play-with-simple-web-ui"></a> Play with simple Web UI
+
+<details>
+  <summary> Click to expand </summary>
+
+<img src="assets/webui.jpg">
+
+After you have completed the model conversion according to the above process, you can use the following command to start a simple Web UI:
+
+```bash
+python -m python_coreml_stable_diffusion.web -i <output-mlpackages-directory> --compute-unit ALL
+```
+
+After the command is executed, we will get a log similar to the following:
+
+```bash
+WARNING:coremltools:Torch version 1.13.0 has not been tested with coremltools. You may run into unexpected errors. Torch 1.12.1 is the most recent version that has been tested.
+INFO:python_coreml_stable_diffusion.pipeline:Initializing PyTorch pipe for reference configuration
+...
+...
+INFO:python_coreml_stable_diffusion.pipeline:Done.
+INFO:python_coreml_stable_diffusion.pipeline:Initializing Core ML pipe for image generation
+INFO:python_coreml_stable_diffusion.pipeline:Stable Diffusion configured to generate 512x512 images
+INFO:python_coreml_stable_diffusion.pipeline:Done.
+Running on local URL:  http://0.0.0.0:7860
+
+To create a public link, set `share=True` in `launch()`.
+```
+
+Open `http://0.0.0.0:7860` in your browser to start your Core ML Stable Diffusion adventure.
+
+
+Web UI relies on gradio, a great interface framework. If you have not installed it, then execute the above command, the program will try to install it automatically.
+
+If the installation fails, you can try to manually execute the following command to complete the dependency installation.
+
+```bash
+pip install gradio
+```
+
+When the installation is complete, re-execute the above command to start the Web UI.
+
+</details>
+
 ##  <a name="faq"></a> FAQ
 
 <details>

assets/webui.jpg

@@ -0,0 +1,108 @@
+try:
+    import gradio as gr
+    import python_coreml_stable_diffusion.pipeline as pipeline
+    from diffusers import StableDiffusionPipeline
+
+    def init(args):
+        pipeline.logger.info("Initializing PyTorch pipe for reference configuration")
+        pytorch_pipe = StableDiffusionPipeline.from_pretrained(args.model_version,
+                                                            use_auth_token=True)
+
+        user_specified_scheduler = None
+        if args.scheduler is not None:
+            user_specified_scheduler = pipeline.SCHEDULER_MAP[
+                args.scheduler].from_config(pytorch_pipe.scheduler.config)
+
+        coreml_pipe = pipeline.get_coreml_pipe(pytorch_pipe=pytorch_pipe,
+                                    mlpackages_dir=args.i,
+                                    model_version=args.model_version,
+                                    compute_unit=args.compute_unit,
+                                    scheduler_override=user_specified_scheduler)
+
+
+        def infer(prompt, steps):
+            pipeline.logger.info("Beginning image generation.")
+            image = coreml_pipe(
+                prompt=prompt,
+                height=coreml_pipe.height,
+                width=coreml_pipe.width,
+                num_inference_steps=steps,
+            )
+            images = []
+            images.append(image["images"][0])
+            return images
+
+
+        demo = gr.Blocks()
+
+        with demo:
+            gr.Markdown(
+                "<center><h1>Core ML Stable Diffusion</h1>Run Stable Diffusion on Apple Silicon with Core ML</center>")
+            with gr.Group():
+                with gr.Box():
+                    with gr.Row():
+                        with gr.Column():
+                            with gr.Row():
+                                text = gr.Textbox(
+                                    label="Prompt",
+                                    lines=11,
+                                    placeholder="Enter your prompt",
+                                )
+                            with gr.Row():
+                                btn = gr.Button("Generate image")
+                            with gr.Row():
+                                steps = gr.Slider(label="Steps", minimum=1,
+                                                maximum=50, value=10, step=1)
+                        with gr.Column():
+                            gallery = gr.Gallery(
+                                label="Generated image", elem_id="gallery"
+                            )
+
+                text.submit(infer, inputs=[text, steps], outputs=gallery)
+                btn.click(infer, inputs=[text, steps], outputs=gallery)
+
+        demo.launch(debug=True, server_name="0.0.0.0")
+
+
+    if __name__ == "__main__":
+        parser = pipeline.argparse.ArgumentParser()
+
+        parser.add_argument(
+            "-i",
+            required=True,
+            help=("Path to input directory with the .mlpackage files generated by "
+                "python_coreml_stable_diffusion.torch2coreml"))
+        parser.add_argument(
+            "--model-version",
+            default="CompVis/stable-diffusion-v1-4",
+            help=
+            ("The pre-trained model checkpoint and configuration to restore. "
+            "For available versions: https://huggingface.co/models?search=stable-diffusion"
+            ))
+        parser.add_argument(
+            "--compute-unit",
+            choices=pipeline.get_available_compute_units(),
+            default="ALL",
+            help=("The compute units to be used when executing Core ML models. "
+                f"Options: {pipeline.get_available_compute_units()}"))
+        parser.add_argument(
+            "--scheduler",
+            choices=tuple(pipeline.SCHEDULER_MAP.keys()),
+            default=None,
+            help=("The scheduler to use for running the reverse diffusion process. "
+                "If not specified, the default scheduler from the diffusers pipeline is utilized"))
+
+        args = parser.parse_args()
+        init(args)
+
+except ModuleNotFoundError as moduleNotFound:
+    print(f'Found that `gradio` is not installed, try to install it automatically')
+    try:
+        import subprocess
+        import sys
+
+        subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'gradio'])
+        print(f'Successfully installed missing package `gradio`.')
+        print(f'Now re-execute the command :D')
+    except subprocess.CalledProcessError:
+        print(f'Automatic package installation failed, try manually executing `pip install gradio`, then retry the command again.')