message: Add basic logging to metagraph transform
diff: @@ -31,6 +31,7 @@ from tensorflow.python.client import session as _session
  from tensorflow.python.framework import graph_util as _graph_util
  from tensorflow.python.framework import importer as _importer
  from tensorflow.python.framework import ops as _ops
  +from tensorflow.python.platform import tf_logging as _logging
  from tensorflow.python.saved_model import constants as _saved_model_constants
  from tensorflow.python.training import saver as _saver_lib
  from tensorflow.python.util import compat as _compat
  @@ -476,6 +477,12 @@ def _add_pruned_collection(base_meta_graph_def, meta_graph_def,
  collection.bytes_list.value[:] = [
  s for s in base_collection.bytes_list.value
  if not _is_removed_mentioned(s, removed_op_names)]
  + _logging.info(
  + 'In collection %s, nodes excluded are: %s', collection_name,
  + sorted([
  + s for s in base_collection.bytes_list.value
  + if _is_removed_mentioned(s, removed_op_names)
  + ]))
  elif base_collection.HasField('node_list'):
  collection.node_list.value[:] = [
  s for s in base_collection.node_list.value
  @@ -745,6 +752,9 @@ def meta_graph_transform(
  retained_op_names = [_compat.as_str(node.name)
  for node in meta_graph_def.graph_def.node]
  removed_op_names = set(base_op_names) - set(retained_op_names)
  + _logging.info('Node names in base graph: %s', sorted(base_op_names))
  + _logging.info('Node names retained: %s', sorted(retained_op_names))
  + _logging.info('Node names removed: %s', sorted(removed_op_names))
  # Copy saver, excluding any pruned nodes if graph was not frozen.
  # TODO(b/63447631): Revisit this once the problem is addressed. Currently
  