tf.raw_ops.ParseExampleV2

Transforms a vector of tf.Example protos (as strings) into typed tensors.

tf.raw_ops.ParseExampleV2(
    serialized, names, sparse_keys, dense_keys, ragged_keys, dense_defaults,
    num_sparse, sparse_types, ragged_value_types, ragged_split_types, dense_shapes,
    name=None
)

Args:

  • serialized: A Tensor of type string. A scalar or vector containing binary serialized Example protos.
  • names: A Tensor of type string. A tensor containing the names of the serialized protos. Corresponds 1:1 with the serialized tensor. May contain, for example, table key (descriptive) names for the corresponding serialized protos. These are purely useful for debugging purposes, and the presence of values here has no effect on the output. May also be an empty vector if no names are available. If non-empty, this tensor must have the same shape as "serialized".
  • sparse_keys: A Tensor of type string. Vector of strings. The keys expected in the Examples' features associated with sparse values.
  • dense_keys: A Tensor of type string. Vector of strings. The keys expected in the Examples' features associated with dense values.
  • ragged_keys: A Tensor of type string. Vector of strings. The keys expected in the Examples' features associated with ragged values.
  • dense_defaults: A list of Tensor objects with types from: float32, int64, string. A list of Tensors (some may be empty). Corresponds 1:1 with dense_keys. dense_defaults[j] provides default values when the example's feature_map lacks dense_key[j]. If an empty Tensor is provided for dense_defaults[j], then the Feature dense_keys[j] is required. The input type is inferred from dense_defaults[j], even when it's empty. If dense_defaults[j] is not empty, and dense_shapes[j] is fully defined, then the shape of dense_defaults[j] must match that of dense_shapes[j]. If dense_shapes[j] has an undefined major dimension (variable strides dense feature), dense_defaults[j] must contain a single element: the padding element.
  • num_sparse: An int that is >= 0. The number of sparse keys.
  • sparse_types: A list of tf.DTypes from: tf.float32, tf.int64, tf.string. A list of num_sparse types; the data types of data in each Feature given in sparse_keys. Currently the ParseExample supports DT_FLOAT (FloatList), DT_INT64 (Int64List), and DT_STRING (BytesList).
  • ragged_value_types: A list of tf.DTypes from: tf.float32, tf.int64, tf.string. A list of num_ragged types; the data types of data in each Feature given in ragged_keys (where num_ragged = sparse_keys.size()). Currently the ParseExample supports DT_FLOAT (FloatList), DT_INT64 (Int64List), and DT_STRING (BytesList).
  • ragged_split_types: A list of tf.DTypes from: tf.int32, tf.int64. A list of num_ragged types; the data types of row_splits in each Feature given in ragged_keys (where num_ragged = sparse_keys.size()). May be DT_INT32 or DT_INT64.
  • dense_shapes: A list of shapes (each a tf.TensorShape or list of ints). A list of num_dense shapes; the shapes of data in each Feature given in dense_keys (where num_dense = dense_keys.size()). The number of elements in the Feature corresponding to dense_key[j] must always equal dense_shapes[j].NumEntries(). If dense_shapes[j] == (D0, D1, ..., DN) then the shape of output Tensor dense_values[j] will be (|serialized|, D0, D1, ..., DN): The dense outputs are just the inputs row-stacked by batch. This works for dense_shapes[j] = (-1, D1, ..., DN). In this case the shape of the output Tensor dense_values[j] will be (|serialized|, M, D1, .., DN), where M is the maximum number of blocks of elements of length D1 * .... * DN, across all minibatch entries in the input. Any minibatch entry with less than M blocks of elements of length D1 * ... * DN will be padded with the corresponding default_value scalar element along the second dimension.
  • name: A name for the operation (optional).

Returns:

A tuple of Tensor objects (sparse_indices, sparse_values, sparse_shapes, dense_values, ragged_values, ragged_row_splits).

  • sparse_indices: A list of num_sparse Tensor objects with type int64.
  • sparse_values: A list of Tensor objects of type sparse_types.
  • sparse_shapes: A list of num_sparse Tensor objects with type int64.
  • dense_values: A list of Tensor objects. Has the same type as dense_defaults.
  • ragged_values: A list of Tensor objects of type ragged_value_types.
  • ragged_row_splits: A list of Tensor objects of type ragged_split_types.