Shim tflm_runtime.py to not break existing code after #2030 (#2032)

BUG=http://b/286456378

tensorflow/lite/micro/examples/recipes/resource_variables_test.py

diff --git a/tensorflow/lite/micro/examples/recipes/resource_variables_test.py b/tensorflow/lite/micro/examples/recipes/resource_variables_test.py
index c2ec582..ad8c79e 100644
--- a/tensorflow/lite/micro/examples/recipes/resource_variables_test.py
+++ b/tensorflow/lite/micro/examples/recipes/resource_variables_test.py
@@ -17,7 +17,10 @@
 from tensorflow.python.framework import test_util
 from tensorflow.python.platform import test
 from tflite_micro.tensorflow.lite.micro.examples.recipes import resource_variables_lib
-from tflite_micro.tensorflow.lite.micro.python.interpreter.src import runtime
+
+# TODO(b/286456378): change tflm_runtime to runtime when we all other usage has
+# been updated.
+from tflite_micro.tensorflow.lite.micro.python.interpreter.src import tflm_runtime
 
 
 class ResourceVariablesTest(test_util.TensorFlowTestCase):
@@ -27,7 +30,7 @@
   # (variable value), to be accumulated by 5.0 each invoke.
   def test_resource_variables_model(self):
     model_keras = resource_variables_lib.get_model_from_keras()
-    tflm_interpreter = runtime.Interpreter.from_bytes(model_keras)
+    tflm_interpreter = tflm_runtime.Interpreter.from_bytes(model_keras)
 
     tflm_interpreter.set_input([[True]], 0)
     tflm_interpreter.set_input([np.full((100,), 15.0, dtype=np.float32)], 1)

tensorflow/lite/micro/python/interpreter/src/BUILD

diff --git a/tensorflow/lite/micro/python/interpreter/src/BUILD b/tensorflow/lite/micro/python/interpreter/src/BUILD
index 6b698c3..3fc77d0 100644
--- a/tensorflow/lite/micro/python/interpreter/src/BUILD
+++ b/tensorflow/lite/micro/python/interpreter/src/BUILD
@@ -64,12 +64,12 @@
 )
 
 # tflm_runtime is deprecated, please use runtime instead.
-# TODO(b/286456378): remove the alias once all usage is change to the runtime
-# target.
-alias(
+# TODO(b/286456378): remove once all usage is changed to the runtime target.
+py_library(
     name = "tflm_runtime",
-    actual = ":runtime",
+    srcs = ["tflm_runtime.py"],
     visibility = ["//visibility:public"],
+    deps = [":runtime"],
 )
 
 py_library(

tensorflow/lite/micro/python/interpreter/src/tflm_runtime.py

diff --git a/tensorflow/lite/micro/python/interpreter/src/tflm_runtime.py b/tensorflow/lite/micro/python/interpreter/src/tflm_runtime.py
new file mode 100644
index 0000000..114a321
--- /dev/null
+++ b/tensorflow/lite/micro/python/interpreter/src/tflm_runtime.py
@@ -0,0 +1,17 @@
+# Copyright 2023 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+
+# TODO(b/286456378): remove once all usage is switched to runtime
+from tflite_micro.tensorflow.lite.micro.python.interpreter.src.runtime import *