diff --git a/tensorflow_lite_support/cc/task/processor/proto/BUILD b/tensorflow_lite_support/cc/task/processor/proto/BUILD
index 9b64c8593..a2f2b83b9 100644
--- a/tensorflow_lite_support/cc/task/processor/proto/BUILD
+++ b/tensorflow_lite_support/cc/task/processor/proto/BUILD
@@ -44,6 +44,9 @@ support_py_proto_library(
     srcs = ["classifications.proto"],
     api_version = 2,
     proto_deps = [":classifications_proto"],
+    py_proto_deps = [
+        ":class_py_pb2",
+    ],
 )
 
 proto_library(
diff --git a/tensorflow_lite_support/python/test/task/audio/audio_classifier_test.py b/tensorflow_lite_support/python/test/task/audio/audio_classifier_test.py
index 45abcde86..80eed9145 100644
--- a/tensorflow_lite_support/python/test/task/audio/audio_classifier_test.py
+++ b/tensorflow_lite_support/python/test/task/audio/audio_classifier_test.py
@@ -23,7 +23,6 @@
 from tensorflow_lite_support.python.task.audio.core import audio_record
 from tensorflow_lite_support.python.task.audio.core import tensor_audio
 from tensorflow_lite_support.python.task.core.proto import base_options_pb2
-from tensorflow_lite_support.python.task.processor.proto import class_pb2
 from tensorflow_lite_support.python.task.processor.proto import classification_options_pb2
 from tensorflow_lite_support.python.task.processor.proto import classifications_pb2
 from tensorflow_lite_support.python.test import test_util
@@ -35,62 +34,75 @@
 
 _FIXED_INPUT_SIZE_MODEL_FILE = 'yamnet_audio_classifier_with_metadata.tflite'
 _SPEECH_AUDIO_FILE = 'speech.wav'
-_FIXED_INPUT_SIZE_MODEL_CLASSIFICATIONS = {
-    'scores': [
-        {
-            'index': 0,
-            'score': 0.917969,
-            'class_name': 'Speech'
-        },
-        {
-            'index': 500,
-            'score': 0.058594,
-            'class_name': 'Inside, small room'
-        },
-        {
-            'index': 494,
-            'score': 0.015625,
-            'class_name': 'Silence'
-        }
-    ]
+_FIXED_INPUT_SIZE_MODEL_CLASSIFICATIONS = """
+classifications {
+  classes {
+    index: 0
+    score: 0.917969
+    class_name: "Speech"
+  }
+  classes {
+    index: 500
+    score: 0.058594
+    class_name: "Inside, small room"
+  }
+  classes {
+    index: 494
+    score: 0.013672
+    class_name: "Silence"
+  }
+  head_index: 0
+  head_name: "scores"
 }
+"""
 
 _MULTIHEAD_MODEL_FILE = 'two_heads.tflite'
 _TWO_HEADS_AUDIO_FILE = 'two_heads.wav'
-_MULTIHEAD_MODEL_CLASSIFICATIONS = {
-    'yamnet_classification': [{
-        'index': 508,
-        'score': 0.548616,
-        'class_name': 'Environmental noise'
-    }, {
-        'index': 507,
-        'score': 0.380869,
-        'class_name': 'Noise'
-    }, {
-        'index': 106,
-        'score': 0.256137,
-        'class_name': 'Bird'
-    }],
-    'bird_classification': [{
-        'index': 4,
-        'score': 0.933997,
-        'class_name': 'Chestnut-crowned Antpitta'
-    }, {
-        'index': 1,
-        'score': 0.065934,
-        'class_name': 'White-breasted Wood-Wren'
-    }, {
-        'index': 0,
-        'score': 6.1469495e-05,
-        'class_name': 'Red Crossbill'
-    }]
+_MULTIHEAD_MODEL_CLASSIFICATIONS = """
+classifications {
+  classes {
+    index: 508
+    score: 0.548616
+    class_name: "Environmental noise"
+  }
+  classes {
+    index: 507
+    score: 0.380869
+    class_name: "Noise"
+  }
+  classes {
+    index: 106
+    score: 0.256137
+    class_name: "Bird"
+  }
+  head_index: 0
+  head_name: "yamnet_classification"
 }
+classifications {
+  classes {
+    index: 4
+    score: 0.933997
+    class_name: "Chestnut-crowned Antpitta"
+  }
+  classes {
+    index: 1
+    score: 0.065934
+    class_name: "White-breasted Wood-Wren"
+  }
+  classes {
+    index: 0
+    score: 6.1469495e-05
+    class_name: "Red Crossbill"
+  }
+  head_index: 1
+  head_name: "bird_classification"
+}
+"""
 
 _ALLOW_LIST = ['Speech', 'Inside, small room']
 _DENY_LIST = ['Speech']
 _SCORE_THRESHOLD = 0.5
 _MAX_RESULTS = 3
-_ACCEPTABLE_ERROR_RANGE = 0.005
 
 
 class ModelFileType(enum.Enum):
@@ -107,19 +119,6 @@ def _create_classifier_from_options(base_options, **classification_options):
   return classifier
 
 
-def _build_test_data(classifications):
-  expected_result = classifications_pb2.ClassificationResult()
-
-  for index, (head_name, categories) in enumerate(classifications.items()):
-    classifications = classifications_pb2.Classifications(
-        head_index=index, head_name=head_name)
-    classifications.classes.extend(
-        [class_pb2.Category(**args) for args in categories])
-    expected_result.classifications.append(classifications)
-
-  return expected_result
-
-
 class AudioClassifierTest(parameterized.TestCase, tf.test.TestCase):
 
   def setUp(self):
@@ -192,7 +191,7 @@ def test_create_audio_record_from_classifier_succeeds(self, _):
       (_MULTIHEAD_MODEL_FILE, ModelFileType.FILE_CONTENT, _TWO_HEADS_AUDIO_FILE,
        3, _MULTIHEAD_MODEL_CLASSIFICATIONS))
   def test_classify_model(self, model_name, model_file_type, audio_file_name,
-                          max_results, expected_classifications):
+                          max_results, expected_result_text_proto):
     # Creates classifier.
     model_path = test_util.get_test_data_path(model_name)
     if model_file_type is ModelFileType.FILE_NAME:
@@ -216,13 +215,8 @@ def test_classify_model(self, model_name, model_file_type, audio_file_name,
     # Classifies the input.
     audio_result = classifier.classify(tensor)
 
-    # Builds test data.
-    expected_result = _build_test_data(expected_classifications)
-
     # Comparing results.
-    classification_result = classifications_pb2.ClassificationResult()
-    classification_result.ParseFromString(audio_result.SerializeToString())
-    self.assertProtoEquals(classification_result, expected_result)
+    self.assertProtoEquals(expected_result_text_proto, audio_result)
 
   def test_max_results_option(self):
     # Creates classifier.
diff --git a/tensorflow_lite_support/python/test/task/vision/BUILD b/tensorflow_lite_support/python/test/task/vision/BUILD
index eeb47668e..640f0b238 100644
--- a/tensorflow_lite_support/python/test/task/vision/BUILD
+++ b/tensorflow_lite_support/python/test/task/vision/BUILD
@@ -36,7 +36,6 @@ py_test(
         # build rule placeholder: tensorflow dep,
         "//tensorflow_lite_support/python/task/core/proto:base_options_py_pb2",
         "//tensorflow_lite_support/python/task/processor/proto:bounding_box_pb2",
-        "//tensorflow_lite_support/python/task/processor/proto:class_pb2",
         "//tensorflow_lite_support/python/task/processor/proto:classification_options_pb2",
         "//tensorflow_lite_support/python/task/processor/proto:classifications_pb2",
         "//tensorflow_lite_support/python/task/vision:image_classifier",
@@ -75,8 +74,6 @@ py_test(
     deps = [
         # build rule placeholder: tensorflow dep,
         "//tensorflow_lite_support/python/task/core/proto:base_options_py_pb2",
-        "//tensorflow_lite_support/python/task/processor/proto:bounding_box_pb2",
-        "//tensorflow_lite_support/python/task/processor/proto:class_pb2",
         "//tensorflow_lite_support/python/task/processor/proto:detection_options_pb2",
         "//tensorflow_lite_support/python/task/processor/proto:detections_pb2",
         "//tensorflow_lite_support/python/task/vision:object_detector",
diff --git a/tensorflow_lite_support/python/test/task/vision/image_classifier_test.py b/tensorflow_lite_support/python/test/task/vision/image_classifier_test.py
index d6dcb60f0..b184ce7d2 100644
--- a/tensorflow_lite_support/python/test/task/vision/image_classifier_test.py
+++ b/tensorflow_lite_support/python/test/task/vision/image_classifier_test.py
@@ -20,7 +20,6 @@
 
 from tensorflow_lite_support.python.task.core.proto import base_options_pb2
 from tensorflow_lite_support.python.task.processor.proto import bounding_box_pb2
-from tensorflow_lite_support.python.task.processor.proto import class_pb2
 from tensorflow_lite_support.python.task.processor.proto import classification_options_pb2
 from tensorflow_lite_support.python.task.processor.proto import classifications_pb2
 from tensorflow_lite_support.python.task.vision import image_classifier
@@ -37,7 +36,6 @@
 _DENY_LIST = ['cheeseburger']
 _SCORE_THRESHOLD = 0.5
 _MAX_RESULTS = 3
-_ACCEPTABLE_ERROR_RANGE = 0.000001
 
 
 def _create_classifier_from_options(base_options, **classification_options):
@@ -49,16 +47,6 @@ def _create_classifier_from_options(base_options, **classification_options):
   return classifier
 
 
-def _build_test_data(expected_categories):
-  classifications = classifications_pb2.Classifications(head_index=0)
-  classifications.classes.extend(
-      [class_pb2.Category(**args) for args in expected_categories])
-  expected_result = classifications_pb2.ClassificationResult()
-  expected_result.classifications.append(classifications)
-
-  return expected_result
-
-
 class ModelFileType(enum.Enum):
   FILE_CONTENT = 1
   FILE_NAME = 2
@@ -101,33 +89,47 @@ def test_create_from_options_succeeds_with_valid_model_content(self):
       classifier = _ImageClassifier.create_from_options(options)
       self.assertIsInstance(classifier, _ImageClassifier)
 
-  @parameterized.parameters((ModelFileType.FILE_NAME, 3, [{
-      'index': 934,
-      'score': 0.739974,
-      'class_name': 'cheeseburger'
-  }, {
-      'index': 925,
-      'score': 0.026929,
-      'class_name': 'guacamole'
-  }, {
-      'index': 932,
-      'score': 0.025737,
-      'class_name': 'bagel'
-  }]), (ModelFileType.FILE_CONTENT, 3, [{
-      'index': 934,
-      'score': 0.739974,
-      'class_name': 'cheeseburger'
-  }, {
-      'index': 925,
-      'score': 0.026929,
-      'class_name': 'guacamole'
-  }, {
-      'index': 932,
-      'score': 0.025737,
-      'class_name': 'bagel'
-  }]))
+  @parameterized.parameters((ModelFileType.FILE_NAME, 3, """
+  classifications {
+    classes {
+      index: 934
+      score: 0.739974
+      class_name: "cheeseburger"
+    }
+    classes {
+      index: 925
+      score: 0.026929
+      class_name: "guacamole"
+    }
+    classes { 
+      index: 932 
+      score: 0.025737 
+      class_name: "bagel" 
+    }
+    head_index: 0
+  }
+  """), (ModelFileType.FILE_CONTENT, 3, """
+  classifications {
+    classes {
+      index: 934
+      score: 0.739974
+      class_name: "cheeseburger"
+    }
+    classes {
+      index: 925
+      score: 0.026929
+      class_name: "guacamole"
+    }
+    classes { 
+      index: 932 
+      score: 0.025737 
+      class_name: "bagel" 
+    }
+    head_index: 0
+  }
+  """))
   def test_classify_model(self, model_file_type, max_results,
-                          expected_categories):
+                          expected_result_text_proto):
     # Creates classifier.
     if model_file_type is ModelFileType.FILE_NAME:
       base_options = _BaseOptions(file_name=self.model_path)
@@ -148,13 +150,8 @@ def test_classify_model(self, model_file_type, max_results,
     # Classifies the input.
     image_result = classifier.classify(image, bounding_box=None)
 
-    # Builds test data.
-    expected_result = _build_test_data(expected_categories)
-
     # Comparing results (classification w/o bounding box).
-    classification_result = classifications_pb2.ClassificationResult()
-    classification_result.ParseFromString(image_result.SerializeToString())
-    self.assertProtoEquals(classification_result, expected_result)
+    self.assertProtoEquals(expected_result_text_proto, image_result)
 
   def test_classify_model_with_bounding_box(self):
     # Creates classifier.
@@ -173,27 +170,29 @@ def test_classify_model_with_bounding_box(self):
     image_result = classifier.classify(image, bounding_box)
 
     # Expected results.
-    expected_categories = [{
-        'index': 934,
-        'score': 0.881507,
-        'class_name': 'cheeseburger'
-    }, {
-        'index': 925,
-        'score': 0.019457,
-        'class_name': 'guacamole'
-    }, {
-        'index': 932,
-        'score': 0.012489,
-        'class_name': 'bagel'
-    }]
-
-    # Builds test data.
-    expected_result = _build_test_data(expected_categories)
+    expected_result_text_proto = """
+    classifications {
+      classes {
+        index: 934
+        score: 0.881507
+        class_name: "cheeseburger"
+      }
+      classes {
+        index: 925
+        score: 0.019457
+        class_name: "guacamole"
+      }
+      classes { 
+        index: 932 
+        score: 0.012489 
+        class_name: "bagel" 
+      }
+      head_index: 0
+    }
+    """
 
     # Comparing results (classification w/ bounding box).
-    classification_result = classifications_pb2.ClassificationResult()
-    classification_result.ParseFromString(image_result.SerializeToString())
-    self.assertProtoEquals(classification_result, expected_result)
+    self.assertProtoEquals(expected_result_text_proto, image_result)
 
   def test_max_results_option(self):
     # Creates classifier.
diff --git a/tensorflow_lite_support/python/test/task/vision/object_detector_test.py b/tensorflow_lite_support/python/test/task/vision/object_detector_test.py
index 72012956d..eceb53e5a 100644
--- a/tensorflow_lite_support/python/test/task/vision/object_detector_test.py
+++ b/tensorflow_lite_support/python/test/task/vision/object_detector_test.py
@@ -19,8 +19,6 @@
 import tensorflow as tf
 
 from tensorflow_lite_support.python.task.core.proto import base_options_pb2
-from tensorflow_lite_support.python.task.processor.proto import bounding_box_pb2
-from tensorflow_lite_support.python.task.processor.proto import class_pb2
 from tensorflow_lite_support.python.task.processor.proto import detection_options_pb2
 from tensorflow_lite_support.python.task.processor.proto import detections_pb2
 from tensorflow_lite_support.python.task.vision import object_detector
@@ -33,53 +31,28 @@
 
 _MODEL_FILE = 'coco_ssd_mobilenet_v1_1.0_quant_2018_06_29.tflite'
 _IMAGE_FILE = 'cats_and_dogs.jpg'
-_EXPECTED_DETECTIONS = [
-    ({
-        'origin_x': 54,
-        'origin_y': 396,
-        'width': 393,
-        'height': 196
-    }, {
-        'index': 16,
-        'score': 0.64453125,
-        'class_name': 'cat'
-    }),
-    ({
-        'origin_x': 602,
-        'origin_y': 157,
-        'width': 394,
-        'height': 447
-    }, {
-        'index': 16,
-        'score': 0.59765625,
-        'class_name': 'cat'
-    }),
-    ({
-        'origin_x': 261,
-        'origin_y': 394,
-        'width': 179,
-        'height': 209
-    }, {
-        'index': 16,
-        'score': 0.5625,
-        'class_name': 'cat'
-    }),
-    ({
-        'origin_x': 389,
-        'origin_y': 197,
-        'width': 276,
-        'height': 409
-    }, {
-        'index': 17,
-        'score': 0.51171875,
-        'class_name': 'dog'
-    })
-]
+_EXPECTED_DETECTIONS = """
+detections {
+  bounding_box { origin_x: 54 origin_y: 396 width: 393 height: 196 }
+  classes { index: 16 score: 0.64453125 class_name: "cat" }
+}
+detections {
+  bounding_box { origin_x: 602 origin_y: 157 width: 394 height: 447 }
+  classes { index: 16 score: 0.59765625 class_name: "cat" }
+}
+detections {
+   bounding_box { origin_x: 261 origin_y: 394 width: 179 height: 209 }
+   classes { index: 16 score: 0.5625 class_name: "cat" }
+}
+detections {
+   bounding_box { origin_x: 389 origin_y: 197 width: 276 height: 409 }
+   classes { index: 17 score: 0.51171875 class_name: "dog" }
+}
+"""
 _ALLOW_LIST = ['cat', 'dog']
 _DENY_LIST = ['cat']
 _SCORE_THRESHOLD = 0.3
 _MAX_RESULTS = 3
-_ACCEPTABLE_ERROR_RANGE = 0.000001
 
 
 class ModelFileType(enum.Enum):
@@ -96,20 +69,6 @@ def _create_detector_from_options(base_options, **detection_options):
   return detector
 
 
-def _build_test_data(expected_detections):
-  expected_result = detections_pb2.DetectionResult()
-
-  for index in range(len(expected_detections)):
-    bounding_box, category = expected_detections[index]
-    detection = detections_pb2.Detection()
-    detection.bounding_box.CopyFrom(
-        bounding_box_pb2.BoundingBox(**bounding_box))
-    detection.classes.append(class_pb2.Category(**category))
-    expected_result.detections.append(detection)
-
-  return expected_result
-
-
 class ObjectDetectorTest(parameterized.TestCase, tf.test.TestCase):
 
   def setUp(self):
@@ -151,7 +110,7 @@ def test_create_from_options_succeeds_with_valid_model_content(self):
       (ModelFileType.FILE_NAME, 4, _EXPECTED_DETECTIONS),
       (ModelFileType.FILE_CONTENT, 4, _EXPECTED_DETECTIONS))
   def test_detect_model(self, model_file_type, max_results,
-                        expected_detections):
+                        expected_result_text_proto):
     # Creates detector.
     if model_file_type is ModelFileType.FILE_NAME:
       base_options = _BaseOptions(file_name=self.model_path)
@@ -172,13 +131,8 @@ def test_detect_model(self, model_file_type, max_results,
     # Performs object detection on the input.
     image_result = detector.detect(image)
 
-    # Builds test data.
-    expected_result = _build_test_data(expected_detections)
-
     # Comparing results.
-    detection_result = detections_pb2.DetectionResult()
-    detection_result.ParseFromString(image_result.SerializeToString())
-    self.assertProtoEquals(detection_result, expected_result)
+    self.assertProtoEquals(expected_result_text_proto, image_result)
 
   def test_score_threshold_option(self):
     # Creates detector.