Add rm_pt.py helper script for removing checkpoint files

Summary: Pull Request resolved: https://github.com/pytorch/fairseq/pull/681

Differential Revision: D15147107

fbshipit-source-id: 4452c98059586a4d748868a7659329285a76d5ef

scripts/average_checkpoints.py

 #!/usr/bin/env python3
+# Copyright (c) 2017-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the license found in the LICENSE file in
+# the root directory of this source tree. An additional grant of patent rights
+# can be found in the PATENTS file in the same directory.
 
 import argparse
 import collections

scripts/build_sym_alignment.py

@@ -4,8 +4,6 @@
 # This source code is licensed under the license found in the LICENSE file in
 # the root directory of this source tree. An additional grant of patent rights
 # can be found in the PATENTS file in the same directory.
-#
-
 """
 Use this script in order to build symmetric alignments for your translation
 dataset.

scripts/read_binarized.py

@@ -5,7 +5,6 @@
 # This source code is licensed under the license found in the LICENSE file in
 # the root directory of this source tree. An additional grant of patent rights
 # can be found in the PATENTS file in the same directory.
-#
 
 import argparse
 

scripts/rm_pt.py

+#!/usr/bin/env python
+# Copyright (c) 2017-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the license found in the LICENSE file in
+# the root directory of this source tree. An additional grant of patent rights
+# can be found in the PATENTS file in the same directory.
+
+import argparse
+import os
+import re
+import shutil
+import sys
+
+
+pt_regexp = re.compile(r'checkpoint(\d+|_\d+_\d+|_[a-z]+)\.pt')
+pt_regexp_epoch_based = re.compile(r'checkpoint(\d+)\.pt')
+pt_regexp_update_based = re.compile(r'checkpoint_\d+_(\d+)\.pt')
+
+
+def last_n_checkpoints(files, n):
+    entries = []
+    for f in files:
+        m = pt_regexp_epoch_based.fullmatch(f)
+        if m is not None:
+            entries.append((int(m.group(1)), m.group(0)))
+        else:
+            m = pt_regexp_update_based.fullmatch(f)
+            if m is not None:
+                entries.append((int(m.group(1)), m.group(0)))
+    return [x[1] for x in sorted(entries, reverse=True)[:n]]
+
+
+def every_n_checkpoints(files, n):
+    entries = []
+    for f in files:
+        m = pt_regexp_epoch_based.fullmatch(f)
+        if m is not None:
+            entries.append((int(m.group(1)), m.group(0)))
+        else:
+            m = pt_regexp_update_based.fullmatch(f)
+            if m is not None:
+                entries.append((int(m.group(1)), m.group(0)))
+    return [x[1] for x in sorted(entries)[n-1::n]]
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description=(
+            'Recursively delete checkpoint files from `root_dir`, '
+            'but preserve checkpoint_best.pt and checkpoint_last.pt'
+        )
+    )
+    parser.add_argument('root_dirs', nargs='*')
+    parser.add_argument('--save-last', type=int, default=0, help='number of last checkpoints to save')
+    parser.add_argument('--save-every', type=int, default=0, help='interval of checkpoints to save')
+    parser.add_argument('--preserve-test', action='store_true',
+                        help='preserve checkpoints in dirs that start with test_ prefix (default: delete them)')
+    parser.add_argument('--delete-best', action='store_true', help='delete checkpoint_best.pt')
+    parser.add_argument('--delete-last', action='store_true', help='delete checkpoint_last.pt')
+    parser.add_argument('--no-dereference', action='store_true', help='don\'t dereference symlinks')
+    args = parser.parse_args()
+
+    files_to_desymlink = []
+    files_to_preserve = []
+    files_to_delete = []
+    for root_dir in args.root_dirs:
+        for root, _subdirs, files in os.walk(root_dir):
+            if args.save_last > 0:
+                to_save = set(last_n_checkpoints(files, args.save_last))
+            else:
+                to_save = set()
+            if args.save_every > 0:
+                to_save = to_save | set(every_n_checkpoints(files, args.save_every))
+            for file in files:
+                if not pt_regexp.fullmatch(file):
+                    continue
+                full_path = os.path.join(root, file)
+                if (
+                    (
+                        not os.path.basename(root).startswith('test_')
+                        or args.preserve_test
+                    )
+                    and (
+                        (file == 'checkpoint_last.pt' and not args.delete_last)
+                        or (file == 'checkpoint_best.pt' and not args.delete_best)
+                        or file in to_save
+                    )
+                ):
+                    if os.path.islink(full_path) and not args.no_dereference:
+                        files_to_desymlink.append(full_path)
+                    else:
+                        files_to_preserve.append(full_path)
+                else:
+                    files_to_delete.append(full_path)
+
+    if len(files_to_desymlink) == 0 and len(files_to_delete) == 0:
+        print('Nothing to do.')
+        sys.exit(0)
+
+    print('Operations to perform (in order):')
+    if len(files_to_desymlink) > 0:
+        for file in files_to_desymlink:
+            print(' - preserve (and dereference symlink): ' + file)
+    if len(files_to_preserve) > 0:
+        for file in files_to_preserve:
+            print(' - preserve: ' + file)
+    if len(files_to_delete) > 0:
+        for file in files_to_delete:
+            print(' - delete: ' + file)
+    while True:
+        resp = input('Continue? (Y/N): ')
+        if resp.strip().lower() == 'y':
+            break
+        elif resp.strip().lower() == 'n':
+            sys.exit(0)
+
+    print('Executing...')
+    if len(files_to_desymlink) > 0:
+        for file in files_to_desymlink:
+            realpath = os.path.realpath(file)
+            print('rm ' + file)
+            os.remove(file)
+            print('cp {} {}'.format(realpath, file))
+            shutil.copyfile(realpath, file)
+    if len(files_to_delete) > 0:
+        for file in files_to_delete:
+            print('rm ' + file)
+            os.remove(file)
+
+
+if __name__ == '__main__':
+    main()