The op serializes protobuf messages provided in the input tensors.
tf.raw_ops.EncodeProto(
sizes,
values,
field_names,
message_type,
descriptor_source='local://',
name=None
)
The types of the tensors in values
must match the schema for the fields
specified in field_names
. All the tensors in values
must have a common
shape prefix, batch_shape.
The sizes
tensor specifies repeat counts for each field. The repeat count
(last dimension) of a each tensor in values
must be greater than or equal
to corresponding repeat count in sizes
.
A message_type
name must be provided to give context for the field names.
The actual message descriptor can be looked up either in the linked-in
descriptor pool or a filename provided by the caller using the
descriptor_source
attribute.
For the most part, the mapping between Proto field types and TensorFlow dtypes is straightforward. However, there are a few special cases:
A proto field that contains a submessage or group can only be converted to
DT_STRING
(the serialized submessage). This is to reduce the complexity of the API. The resulting string can be used as input to another instance of the decode_proto op.TensorFlow lacks support for unsigned integers. The ops represent uint64 types as a
DT_INT64
with the same twos-complement bit pattern (the obvious way). Unsigned int32 values can be represented exactly by specifying typeDT_INT64
, or using twos-complement if the caller specifiesDT_INT32
in theoutput_types
attribute.
The descriptor_source
attribute selects the source of protocol
descriptors to consult when looking up message_type
. This may be:
An empty string or "local://", in which case protocol descriptors are created for C++ (not Python) proto definitions linked to the binary.
A file, in which case protocol descriptors are created from the file, which is expected to contain a
FileDescriptorSet
serialized as a string. NOTE: You can build adescriptor_source
file using the--descriptor_set_out
and--include_imports
options to the protocol compilerprotoc
.A "bytes://
", in which protocol descriptors are created from <bytes>
, which is expected to be aFileDescriptorSet
serialized as a string.
Returns | |
---|---|
A Tensor of type string .
|