Always enable TF2 in tflite_convert command line tool. If user needs to use TF1 converter then they can pass --enable_v1_converter.

Before this users needed to set environment variable TF2_BEHAVIOR=1 before invoking the tool to use v2 converter.

PiperOrigin-RevId: 348591322
Change-Id: I25baf70c2bafa56a63ac9c629ad563e26a062d86

tensorflow/lite/python/BUILD

@@ -62,6 +62,7 @@ py_binary(
     visibility = ["//visibility:public"],
     deps = [
         ":tflite_convert_main_lib",
+        "//tensorflow:tensorflow_py",
         "@six_archive//:six",
     ],
 )
@@ -73,6 +74,7 @@ py_library(
     visibility = ["//visibility:public"],
     deps = [
         ":tflite_convert_lib",
+        "//tensorflow:tensorflow_py",
         "@six_archive//:six",
     ],
 )

tensorflow/lite/python/tflite_convert.py

@@ -26,6 +26,8 @@ import warnings
 
 import six
 from six.moves import zip
+# Needed to enable TF2 by default.
+import tensorflow as tf  # pylint: disable=unused-import
 
 from tensorflow.lite.python import lite
 from tensorflow.lite.python.convert import register_custom_opdefs