better checkpoint download

.gitignore

@@ -99,7 +99,7 @@ ENV/
 [Ll]ib64
 [Ll]ocal
 [Ss]cripts
-!scripts\download_model.bat
+!scripts/
 pyvenv.cfg
 .venv
 pip-selfcheck.json

scripts/download_model.py

@@ -0,0 +1,78 @@
+import os
+import sys
+import json
+import requests
+from tqdm import tqdm
+
+def download_file(url: str, filename: str, download_dir: str):
+    """Download a file if it does not already exist."""
+
+    try:
+        filepath = os.path.join(download_dir, filename)
+        content_length = int(requests.head(url).headers.get("content-length", 0))
+
+        # If file already exists and size matches, skip download
+        if os.path.isfile(filepath) and os.path.getsize(filepath) == content_length:
+            print(f"{filepath} already exists. Skipping download.")
+            return
+        if os.path.isfile(filepath) and os.path.getsize(filepath) != content_length:
+            print(f"{filepath} already exists but size does not match. Redownloading.")
+        else:
+            print(f"Downloading {filename} from {url}")
+
+        # Start download, stream=True allows for progress tracking
+        response = requests.get(url, stream=True)
+
+        # Check if request was successful
+        response.raise_for_status()
+
+        # Create progress bar
+        total_size = int(response.headers.get('content-length', 0))
+        progress_bar = tqdm(
+            total=total_size, 
+            unit='iB', 
+            unit_scale=True, 
+            ncols=70, 
+            file=sys.stdout
+        )
+
+        # Write response content to file
+        with open(filepath, 'wb') as f:
+            for data in response.iter_content(chunk_size=1024):
+                f.write(data)
+                progress_bar.update(len(data))  # Update progress bar
+
+        # Close progress bar
+        progress_bar.close()
+
+        # Error handling for incomplete downloads
+        if total_size != 0 and progress_bar.n != total_size:
+            print("ERROR, something went wrong while downloading")
+            raise Exception()
+
+
+    except Exception as e:
+        print(f"An error occurred: {e}")
+
+def main():
+    """Main function to download files from URLs in a config file."""
+    
+    # Get JSON config file path
+    script_dir = os.path.dirname(os.path.realpath(__file__))
+    config_file_path = os.path.join(script_dir, "download_models.json")
+
+    # Set download directory
+    download_dir = "checkpoints"
+    os.makedirs(download_dir, exist_ok=True)
+
+    # Load URL and filenames from JSON
+    with open(config_file_path, "r") as f:
+        config = json.load(f)
+
+    # Download each file specified in config
+    for url, filename in config.items():
+        download_file(url, filename, download_dir)
+
+
+if __name__ == "__main__":
+    main()

scripts/download_models.json

@@ -0,0 +1,10 @@
+{
+  "https://storage.googleapis.com/self-distilled-stylegan/lions_512_pytorch.pkl": "stylegan2_lions_512_pytorch.pkl",
+  "https://storage.googleapis.com/self-distilled-stylegan/dogs_1024_pytorch.pkl": "stylegan2_dogs_1024_pytorch.pkl",
+  "https://storage.googleapis.com/self-distilled-stylegan/horses_256_pytorch.pkl": "stylegan2_horses_256_pytorch.pkl",
+  "https://storage.googleapis.com/self-distilled-stylegan/elephants_512_pytorch.pkl": "stylegan2_elephants_512_pytorch.pkl",
+  "https://api.ngc.nvidia.com/v2/models/nvidia/research/stylegan2/versions/1/files/stylegan2-ffhq-512x512.pkl": "stylegan2-ffhq-512x512.pkl",
+  "https://api.ngc.nvidia.com/v2/models/nvidia/research/stylegan2/versions/1/files/stylegan2-afhqcat-512x512.pkl": "stylegan2-afhqcat-512x512.pkl",
+  "http://d36zk2xti64re0.cloudfront.net/stylegan2/networks/stylegan2-car-config-f.pkl": "stylegan2-car-config-f.pkl",
+  "http://d36zk2xti64re0.cloudfront.net/stylegan2/networks/stylegan2-cat-config-f.pkl": "stylegan2-cat-config-f.pkl"
+}