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Helper that prepares features config from input feature_columns.

The returned feature config can be used as arg 'features' in tf.parse_example.

Typical usage example:

# Define features and transformations
feature_a = sparse_column_with_vocabulary_file(...)
feature_b = real_valued_column(...)
feature_c_bucketized = bucketized_column(real_valued_column("feature_c"), ...)
feature_a_x_feature_c = crossed_column(
  columns=[feature_a, feature_c_bucketized], ...)

feature_columns = set(
  [feature_b, feature_c_bucketized, feature_a_x_feature_c])
batch_examples =

For the above example, create_feature_spec_for_parsing would return the dict: { "feature_a": parsing_ops.VarLenFeature(tf.string), "feature_b": parsing_ops.FixedLenFeature([1], dtype=tf.float32), "feature_c": parsing_ops.FixedLenFeature([1], dtype=tf.float32) }

feature_columns An iterable containing all the feature columns. All items should be instances of classes derived from _FeatureColumn, unless feature_columns is a dict -- in which case, this should be true of all values in the dict.

A dict mapping feature keys to FixedLenFeature or VarLenFeature values.