Add a FLAG checkpoint_model_name to specify the object name when saving the checkpoint,

i.e., the checkpoint will be saved using
tf.train.Checkpoint(FLAGS.checkpoint_model_name=model)

PiperOrigin-RevId: 326672697

official/nlp/bert/tf1_checkpoint_converter_lib.py

@@ -111,11 +111,14 @@ def _get_new_shape(name, shape, num_heads):
   return None
 
 
-def create_v2_checkpoint(model, src_checkpoint, output_path):
+def create_v2_checkpoint(model,
+                         src_checkpoint,
+                         output_path,
+                         checkpoint_model_name="model"):
   """Converts a name-based matched TF V1 checkpoint to TF V2 checkpoint."""
   # Uses streaming-restore in eager model to read V1 name-based checkpoints.
   model.load_weights(src_checkpoint).assert_existing_objects_matched()
-  checkpoint = tf.train.Checkpoint(model=model)
+  checkpoint = tf.train.Checkpoint(**{checkpoint_model_name: model})
   checkpoint.save(output_path)
 
 

official/nlp/bert/tf2_encoder_checkpoint_converter.py

@@ -42,6 +42,10 @@ flags.DEFINE_string(
     "BertModel, with no task heads.)")
 flags.DEFINE_string("converted_checkpoint_path", None,
                     "Name for the created object-based V2 checkpoint.")
+flags.DEFINE_string("checkpoint_model_name", "model",
+                    "The name of the model when saving the checkpoint, i.e., "
+                    "the checkpoint will be saved using: "
+                    "tf.train.Checkpoint(FLAGS.checkpoint_model_name=model).")
 
 
 def _create_bert_model(cfg):
@@ -71,7 +75,8 @@ def _create_bert_model(cfg):
   return bert_encoder
 
 
-def convert_checkpoint(bert_config, output_path, v1_checkpoint):
+def convert_checkpoint(bert_config, output_path, v1_checkpoint,
+                       checkpoint_model_name="model"):
   """Converts a V1 checkpoint into an OO V2 checkpoint."""
   output_dir, _ = os.path.split(output_path)
   tf.io.gfile.makedirs(output_dir)
@@ -90,7 +95,8 @@ def convert_checkpoint(bert_config, output_path, v1_checkpoint):
   # Create a V2 checkpoint from the temporary checkpoint.
   model = _create_bert_model(bert_config)
   tf1_checkpoint_converter_lib.create_v2_checkpoint(model, temporary_checkpoint,
-                                                    output_path)
+                                                    output_path,
+                                                    checkpoint_model_name)
 
   # Clean up the temporary checkpoint, if it exists.
   try:
@@ -103,8 +109,10 @@ def convert_checkpoint(bert_config, output_path, v1_checkpoint):
 def main(_):
   output_path = FLAGS.converted_checkpoint_path
   v1_checkpoint = FLAGS.checkpoint_to_convert
+  checkpoint_model_name = FLAGS.checkpoint_model_name
   bert_config = configs.BertConfig.from_json_file(FLAGS.bert_config_file)
-  convert_checkpoint(bert_config, output_path, v1_checkpoint)
+  convert_checkpoint(bert_config, output_path, v1_checkpoint,
+                     checkpoint_model_name)
 
 
 if __name__ == "__main__":