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# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import shutil
import argparse
from omegaconf import OmegaConf
def copy_latest_checkpoint(source_dir, dest_dir, delete_ckpts=False, load_config=True):
prefix = "checkpoint-"
checkpoints = []
if load_config:
source_config = OmegaConf.load(source_dir)
source_dir = source_config.output_dir
dest_config = OmegaConf.load(dest_dir)
dest_dir = dest_config.output_dir
# Find all valid checkpoint directories
for name in os.listdir(source_dir):
full_path = os.path.join(source_dir, name)
if os.path.isdir(full_path) and name.startswith(prefix):
try:
num = int(name[len(prefix):])
checkpoints.append((num, name))
except ValueError:
continue
if len(checkpoints) == 0:
print("No valid checkpoint folders found.")
return
# Sort checkpoints by number (ascending)
checkpoints.sort()
print("🔍 Found checkpoint folders:")
for num, name in checkpoints:
print(f" - {name}")
# Copy the latest checkpoint
max_num, latest_checkpoint = checkpoints[-1]
src_path = os.path.join(source_dir, latest_checkpoint)
dest_path = os.path.join(dest_dir, latest_checkpoint)
if os.path.isfile(dest_path):
print(f"Latest checkpoint already exists at destination: {dest_path}")
else:
print(f"Copying latest checkpoint: {latest_checkpoint}")
shutil.copytree(src_path, dest_path, dirs_exist_ok=True)
print("Copy completed.")
if delete_ckpts:
# Determine which checkpoints to delete (keep the two newest)
to_delete = checkpoints[:-2] if len(checkpoints) > 2 else []
if to_delete:
print("\n⚠️ The following checkpoint folders will be deleted:")
for num, name in to_delete:
print(f" - {name}")
confirm = input("Do you want to delete these folders? (y/n): ").strip().lower()
if confirm == 'y':
for _, name in to_delete:
path_to_delete = os.path.join(source_dir, name)
shutil.rmtree(path_to_delete)
print(f"🗑️ Deleted: {name}")
print("Old checkpoints deleted.")
else:
print("Deletion cancelled.")
else:
print("Nothing to delete — fewer than 3 checkpoints exist.")
def main():
parser = argparse.ArgumentParser(description="Copy the latest checkpoint and optionally delete older ones.")
parser.add_argument("source", help="Path to the source directory containing checkpoint folders.")
parser.add_argument("destination", help="Path to the destination directory.")
args = parser.parse_args()
copy_latest_checkpoint(args.source, args.destination)
if __name__ == "__main__":
main() |