Write model card in controlnet training script (huggingface#3229)

Write model card in controlnet training script.

Author: pcuenca

examples/controlnet/train_controlnet.py

@@ -60,6 +60,17 @@
 logger = get_logger(__name__)
 
 
+def image_grid(imgs, rows, cols):
+    assert len(imgs) == rows * cols
+
+    w, h = imgs[0].size
+    grid = Image.new("RGB", size=(cols * w, rows * h))
+
+    for i, img in enumerate(imgs):
+        grid.paste(img, box=(i % cols * w, i // cols * h))
+    return grid
+
+
 def log_validation(vae, text_encoder, tokenizer, unet, controlnet, args, accelerator, weight_dtype, step):
     logger.info("Running validation... ")
 
@@ -156,6 +167,8 @@ def log_validation(vae, text_encoder, tokenizer, unet, controlnet, args, acceler
         else:
             logger.warn(f"image logging not implemented for {tracker.name}")
 
+        return image_logs
+
 
 def import_model_class_from_model_name_or_path(pretrained_model_name_or_path: str, revision: str):
     text_encoder_config = PretrainedConfig.from_pretrained(
@@ -177,6 +190,43 @@ def import_model_class_from_model_name_or_path(pretrained_model_name_or_path: st
         raise ValueError(f"{model_class} is not supported.")
 
 
+def save_model_card(repo_id: str, image_logs=None, base_model=str, repo_folder=None):
+    img_str = ""
+    if image_logs is not None:
+        img_str = "You can find some example images below.\n"
+        for i, log in enumerate(image_logs):
+            images = log["images"]
+            validation_prompt = log["validation_prompt"]
+            validation_image = log["validation_image"]
+            validation_image.save(os.path.join(repo_folder, "image_control.png"))
+            img_str += f"prompt: {validation_prompt}\n"
+            images = [validation_image] + images
+            image_grid(images, 1, len(images)).save(os.path.join(repo_folder, f"images_{i}.png"))
+            img_str += f"![images_{i})](./images_{i}.png)\n"
+
+    yaml = f"""
+---
+license: creativeml-openrail-m
+base_model: {base_model}
+tags:
+- stable-diffusion
+- stable-diffusion-diffusers
+- text-to-image
+- diffusers
+- controlnet
+inference: true
+---
+    """
+    model_card = f"""
+# controlnet-{repo_id}
+
+These are controlnet weights trained on {base_model} with new type of conditioning.
+{img_str}
+"""
+    with open(os.path.join(repo_folder, "README.md"), "w") as f:
+        f.write(yaml + model_card)
+
+
 def parse_args(input_args=None):
     parser = argparse.ArgumentParser(description="Simple example of a ControlNet training script.")
     parser.add_argument(
@@ -943,6 +993,7 @@ def load_model_hook(models, input_dir):
         disable=not accelerator.is_local_main_process,
     )
 
+    image_logs = None
     for epoch in range(first_epoch, args.num_train_epochs):
         for step, batch in enumerate(train_dataloader):
             with accelerator.accumulate(controlnet):
@@ -1014,7 +1065,7 @@ def load_model_hook(models, input_dir):
                         logger.info(f"Saved state to {save_path}")
 
                     if args.validation_prompt is not None and global_step % args.validation_steps == 0:
-                        log_validation(
+                        image_logs = log_validation(
                             vae,
                             text_encoder,
                             tokenizer,
@@ -1040,6 +1091,12 @@ def load_model_hook(models, input_dir):
         controlnet.save_pretrained(args.output_dir)
 
         if args.push_to_hub:
+            save_model_card(
+                repo_id,
+                image_logs=image_logs,
+                base_model=args.pretrained_model_name_or_path,
+                repo_folder=args.output_dir,
+            )
             upload_folder(
                 repo_id=repo_id,
                 folder_path=args.output_dir,