code: def Reader(path, proto=None, compression_type=None):
      """A TFRecordReader that defaults to tf.Example protos."""
      if not proto:
          proto = example_pb2.Example
  
      return genomics_reader.TFRecordReader(
          path, proto, compression_type=compression_type
      )
  
file_path: deepvariant/third_party/nucleus/io/tfrecord.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import heapq
  import contextlib2
  from third_party.nucleus.io import genomics_reader
  from third_party.nucleus.io import genomics_writer
  from third_party.nucleus.io import sharded_file_utils
  from tensorflow.core.example import example_pb2
label_desc: Use image node_id 1 for calling a global function with example usage: Reader(path, proto, compression_type) and returns: genomics_reader