code: def _build_keys_for_sparse_features(features):
      """
      Builds the fully qualified names for keys of sparse features.
  
      Args:
          features:  A map of features with keys to TensorFlow features.
  
      Returns:
          A map of features where for the sparse feature
          the 'index_key' and the 'value_key' have been expanded
          properly for the parser in the native code.
      """
  
      def resolve_key(parser_key, index_or_value_key):
          if not index_or_value_key.startswith("@"):
              return parser_key + "[*]." + index_or_value_key
          return index_or_value_key[1:]
  
      def resolve_index_key(key_, index_key):
          if isinstance(index_key, list):
              return [
                  resolve_key(key_, index_key_)
                  for index_key_ in index_key
              ]
          return resolve_key(key_, index_key)
  
      if features:
          modified_features = dict(features)  # Create a copy to modify
          # NOTE: We iterate over sorted keys to keep things deterministic.
          for key, feature in features.items():
              if isinstance(feature, tf.io.SparseFeature):
                  modified_features[key] = tf.io.SparseFeature(
                      index_key=resolve_index_key(
                          key, feature.index_key
                      ),
                      value_key=resolve_key(key, feature.value_key),
                      dtype=feature.dtype,
                      size=feature.size,
                      already_sorted=feature.already_sorted,
                  )
          return modified_features
      return features
  
file_path: io/tensorflow_io/python/experimental/parse_avro_ops.py
imports: import collections
  import re
  import tensorflow
  import tensorflow_io
  from tensorflow_io.python.ops import core_ops
label_desc: Use image node_id 4 for calling a global function with example usage: _build_keys_for_sparse_features(features) and returns: features, index_or_value_key, resolve_key, modified_features, unknown, unknown