Fix issue using python flatbuffers library.

PiperOrigin-RevId: 331663655
Change-Id: I6b4f617177717faf6d0c216f3ca6bb5aba46ddbe

tensorflow/lite/python/BUILD

@@ -217,6 +217,7 @@ py_library(
         "//tensorflow/python:tf_optimizer",
         "//tensorflow/python/eager:wrap_function",
         "@absl_py//absl/logging",
+        "@flatbuffers//:runtime_py",
         "@six_archive//:six",
     ],
 )

tensorflow/lite/python/util.py

@@ -27,6 +27,7 @@ from absl import logging
 import six
 from six.moves import range
 
+import flatbuffers
 from tensorflow.core.protobuf import config_pb2 as _config_pb2
 from tensorflow.core.protobuf import graph_debug_info_pb2
 from tensorflow.core.protobuf import meta_graph_pb2 as _meta_graph_pb2
@@ -577,7 +578,7 @@ def _convert_model_from_bytearray_to_object(model_bytearray):
 def _convert_model_from_object_to_bytearray(model_object):
   """Converts a tflite model from a parsable object into a bytearray."""
   # Initial size of the buffer, which will grow automatically if needed
-  builder = schema_fb.flatbuffers.Builder(1024)
+  builder = flatbuffers.Builder(1024)
   model_offset = model_object.Pack(builder)
   builder.Finish(model_offset, file_identifier=_TFLITE_FILE_IDENTIFIER)
   return bytes(builder.Output())

tensorflow/lite/tools/BUILD

@@ -112,6 +112,7 @@ py_library(
     srcs_version = "PY2AND3",
     deps = [
         "//tensorflow/lite/python:schema_py",
+        "@flatbuffers//:runtime_py",
     ],
 )
 
@@ -137,6 +138,7 @@ py_library(
     srcs_version = "PY2AND3",
     deps = [
         "//tensorflow/lite/python:schema_py",
+        "@flatbuffers//:runtime_py",
     ],
 )
 

tensorflow/lite/tools/flatbuffer_utils.py

@@ -30,6 +30,7 @@ import os
 import random
 import re
 
+import flatbuffers
 from tensorflow.lite.python import schema_py_generated as schema_fb
 
 _TFLITE_FILE_IDENTIFIER = b'TFL3'
@@ -83,7 +84,7 @@ def read_model_with_mutable_tensors(input_tflite_file):
 def convert_object_to_bytearray(model_object):
   """Converts a tflite model from an object to a immutable bytearray."""
   # Initial size of the buffer, which will grow automatically if needed
-  builder = schema_fb.flatbuffers.Builder(1024)
+  builder = flatbuffers.Builder(1024)
   model_offset = model_object.Pack(builder)
   builder.Finish(model_offset, file_identifier=_TFLITE_FILE_IDENTIFIER)
   model_bytearray = bytes(builder.Output())
@@ -156,7 +157,7 @@ def randomize_weights(model, random_seed=0):
 
 
 def xxd_output_to_bytes(input_cc_file):
-  """Converts xxd output C++ source file to bytes (immutable).
+  """Converts xxd output C++ source file to bytes (immutable)
 
   Args:
     input_cc_file: Full path name to th C++ source file dumped by xxd
@@ -195,7 +196,7 @@ def xxd_output_to_bytes(input_cc_file):
 
 
 def xxd_output_to_object(input_cc_file):
-  """Converts xxd output C++ source file to object.
+  """Converts xxd output C++ source file to object
 
   Args:
     input_cc_file: Full path name to th C++ source file dumped by xxd

tensorflow/lite/tools/test_utils.py

@@ -21,6 +21,7 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
+import flatbuffers
 from tensorflow.lite.python import schema_py_generated as schema_fb
 
 TFLITE_SCHEMA_VERSION = 3
@@ -28,7 +29,7 @@ TFLITE_SCHEMA_VERSION = 3
 
 def build_mock_flatbuffer_model():
   """Creates a flatbuffer containing an example model."""
-  builder = schema_fb.flatbuffers.Builder(1024)
+  builder = flatbuffers.Builder(1024)
 
   schema_fb.BufferStart(builder)
   buffer0_offset = schema_fb.BufferEnd(builder)

third_party/flatbuffers/build_defs.bzl

@@ -370,8 +370,8 @@ def _concat_flatbuffer_py_srcs_impl(ctx):
         outputs = [ctx.outputs.out],
         command = (
             "find '%s' -name '*.py' -exec cat {} + |" +
-            "sed 's/from flatbuffers./from flatbuffers.python.flatbuffers./g' |" +
+            "sed 's/from flatbuffers.compat import import_numpy/import numpy as np' |" +
-            "sed 's/import flatbuffers/from flatbuffers.python import flatbuffers/g' > %s"
+            "sed '/np = import_numpy()/d' > %s"
         ) % (
             ctx.attr.deps[0].files.to_list()[0].path,
             ctx.outputs.out.path,