[SD] Reorganize the stable diffusion model. (#806)

The stable diffusion codebase has been reorganized to make it more
modular so that the same script can be used for web as well as cli,
instead of duplicating the whole codebase.

Signed-off-by: Gaurav Shukla <gaurav@nod-labs.com>

apps/stable_diffusion/scripts/__init__.py

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+from .txt2img import txt2img_inf

apps/stable_diffusion/scripts/txt2img.py

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+import os
+
+os.environ["AMD_ENABLE_LLPC"] = "1"
+
+import torch
+import re
+import time
+from pathlib import Path
+from datetime import datetime as dt
+from dataclasses import dataclass
+from csv import DictWriter
+from apps.stable_diffusion.src import (
+    args,
+    Text2ImagePipeline,
+    get_schedulers,
+    set_init_device_flags,
+)
+
+
+@dataclass
+class Config:
+    model_id: str
+    ckpt_loc: str
+    precision: str
+    batch_size: int
+    max_length: int
+    height: int
+    width: int
+    device: str
+
+
+# This has to come before importing cache objects
+if args.clear_all:
+    print("CLEARING ALL, EXPECT SEVERAL MINUTES TO RECOMPILE")
+    from glob import glob
+    import shutil
+
+    vmfbs = glob(os.path.join(os.getcwd(), "*.vmfb"))
+    for vmfb in vmfbs:
+        if os.path.exists(vmfb):
+            os.remove(vmfb)
+    home = os.path.expanduser("~")
+    if os.name == "nt":  # Windows
+        appdata = os.getenv("LOCALAPPDATA")
+        shutil.rmtree(os.path.join(appdata, "AMD/VkCache"), ignore_errors=True)
+        shutil.rmtree(os.path.join(home, "shark_tank"), ignore_errors=True)
+    elif os.name == "unix":
+        shutil.rmtree(os.path.join(home, ".cache/AMD/VkCache"))
+        shutil.rmtree(os.path.join(home, ".local/shark_tank"))
+
+
+# save output images and the inputs correspoding to it.
+def save_output_img(output_img):
+    output_path = args.output_dir if args.output_dir else Path.cwd()
+    generated_imgs_path = Path(output_path, "generated_imgs")
+    generated_imgs_path.mkdir(parents=True, exist_ok=True)
+    csv_path = Path(generated_imgs_path, "imgs_details.csv")
+
+    prompt_slice = re.sub("[^a-zA-Z0-9]", "_", args.prompts[0][:15])
+    out_img_name = (
+        f"{prompt_slice}_{args.seed}_{dt.now().strftime('%y%m%d_%H%M%S')}"
+    )
+    out_img_path = Path(generated_imgs_path, f"{out_img_name}.jpg")
+    output_img.save(out_img_path, quality=95, subsampling=0)
+
+    new_entry = {
+        "VARIANT": args.hf_model_id,
+        "SCHEDULER": args.scheduler,
+        "PROMPT": args.prompts[0],
+        "NEG_PROMPT": args.negative_prompts[0],
+        "SEED": args.seed,
+        "CFG_SCALE": args.guidance_scale,
+        "PRECISION": args.precision,
+        "STEPS": args.steps,
+        "HEIGHT": args.height,
+        "WIDTH": args.width,
+        "MAX_LENGTH": args.max_length,
+        "OUTPUT": out_img_path,
+    }
+
+    with open(csv_path, "a") as csv_obj:
+        dictwriter_obj = DictWriter(csv_obj, fieldnames=list(new_entry.keys()))
+        dictwriter_obj.writerow(new_entry)
+        csv_obj.close()
+
+
+txt2img_obj = None
+config_obj = None
+schedulers = None
+
+# Exposed to UI.
+def txt2img_inf(
+    prompt: str,
+    negative_prompt: str,
+    height: int,
+    width: int,
+    steps: int,
+    guidance_scale: float,
+    seed: int,
+    batch_size: int,
+    scheduler: str,
+    model_id: str,
+    custom_model_id: str,
+    ckpt_file_obj,
+    precision: str,
+    device: str,
+    max_length: int,
+):
+    global txt2img_obj
+    global config_obj
+    global schedulers
+
+    args.prompts = [prompt]
+    args.negative_prompts = [negative_prompt]
+    args.guidance_scale = guidance_scale
+    args.seed = seed
+    args.steps = steps
+    args.scheduler = scheduler
+    args.hf_model_id = custom_model_id if custom_model_id else model_id
+    args.ckpt_loc = ckpt_file_obj.name if ckpt_file_obj else ""
+    dtype = torch.float32 if precision == "fp32" else torch.half
+    cpu_scheduling = not scheduler.startswith("Shark")
+    new_config_obj = Config(
+        args.hf_model_id,
+        args.ckpt_loc,
+        precision,
+        batch_size,
+        max_length,
+        height,
+        width,
+        device,
+    )
+    if config_obj != new_config_obj:
+        config_obj = new_config_obj
+        args.precision = precision
+        args.batch_size = batch_size
+        args.max_length = max_length
+        args.height = height
+        args.width = width
+        args.device = device.split("=>", 1)[1].strip()
+        args.use_tuned = True
+        args.import_mlir = False
+        set_init_device_flags()
+        schedulers = get_schedulers(model_id)
+        scheduler_obj = schedulers[scheduler]
+        txt2img_obj = Text2ImagePipeline.from_pretrained(
+            scheduler_obj,
+            args.import_mlir,
+            args.hf_model_id,
+            args.ckpt_loc,
+            args.precision,
+            args.max_length,
+            args.batch_size,
+            args.height,
+            args.width,
+            args.use_base_vae,
+        )
+    txt2img_obj.scheduler = schedulers[scheduler]
+
+    start_time = time.time()
+    txt2img_obj.log = ""
+    generated_imgs = txt2img_obj.generate_images(
+        prompt,
+        negative_prompt,
+        batch_size,
+        height,
+        width,
+        steps,
+        guidance_scale,
+        seed,
+        args.max_length,
+        dtype,
+        args.use_base_vae,
+        cpu_scheduling,
+    )
+    total_time = time.time() - start_time
+    save_output_img(generated_imgs[0])
+    text_output = f"prompt={args.prompts}"
+    text_output += f"\nnegative prompt={args.negative_prompts}"
+    text_output += f"\nmodel_id={args.hf_model_id}, ckpt_loc={args.ckpt_loc}"
+    text_output += f"\nscheduler={args.scheduler}, device={device}"
+    text_output += f"\nsteps={args.steps}, guidance_scale={args.guidance_scale}, seed={args.seed}, size={args.height}x{args.width}"
+    text_output += (
+        f", batch size={args.batch_size}, max_length={args.max_length}"
+    )
+    text_output += txt2img_obj.log
+    text_output += f"\nTotal image generation time: {total_time:.4f}sec"
+
+    return generated_imgs, text_output
+
+
+if __name__ == "__main__":
+    dtype = torch.float32 if args.precision == "fp32" else torch.half
+    cpu_scheduling = not args.scheduler.startswith("Shark")
+    set_init_device_flags()
+    schedulers = get_schedulers(args.hf_model_id)
+    scheduler_obj = schedulers[args.scheduler]
+
+    txt2img_obj = Text2ImagePipeline.from_pretrained(
+        scheduler_obj,
+        args.import_mlir,
+        args.hf_model_id,
+        args.ckpt_loc,
+        args.precision,
+        args.max_length,
+        args.batch_size,
+        args.height,
+        args.width,
+        args.use_base_vae,
+    )
+
+    start_time = time.time()
+    generated_imgs = txt2img_obj.generate_images(
+        args.prompts,
+        args.negative_prompts,
+        args.batch_size,
+        args.height,
+        args.width,
+        args.steps,
+        args.guidance_scale,
+        args.seed,
+        args.max_length,
+        dtype,
+        args.use_base_vae,
+        cpu_scheduling,
+    )
+    total_time = time.time() - start_time
+    text_output = f"prompt={args.prompts}"
+    text_output += f"\nnegative prompt={args.negative_prompts}"
+    text_output += f"\nmodel_id={args.hf_model_id}, ckpt_loc={args.ckpt_loc}"
+    text_output += f"\nscheduler={args.scheduler}, device={args.device}"
+    text_output += f"\nsteps={args.steps}, guidance_scale={args.guidance_scale}, seed={args.seed}, size={args.height}x{args.width}"
+    text_output += (
+        f", batch size={args.batch_size}, max_length={args.max_length}"
+    )
+    text_output += txt2img_obj.log
+    text_output += f"\nTotal image generation time: {total_time:.4f}sec"
+
+    save_output_img(generated_imgs[0])
+    print(text_output)