fix preprocessor builder to pass correct kwargs to random_crop_pad op.

research/object_detection/builders/preprocessor_builder.py

@@ -187,27 +187,28 @@ def build(preprocessor_step_config):
     config = preprocessor_step_config.random_crop_pad_image
     min_padded_size_ratio = config.min_padded_size_ratio
     if min_padded_size_ratio and len(min_padded_size_ratio) != 2:
-      raise ValueError('min_padded_size_ratio should have 3 elements if set!')
+      raise ValueError('min_padded_size_ratio should have 2 elements if set!')
     max_padded_size_ratio = config.max_padded_size_ratio
     if max_padded_size_ratio and len(max_padded_size_ratio) != 2:
-      raise ValueError('max_padded_size_ratio should have 3 elements if set!')
+      raise ValueError('max_padded_size_ratio should have 2 elements if set!')
     pad_color = config.pad_color
     if pad_color and len(pad_color) != 3:
       raise ValueError('pad_color should have 3 elements if set!')
-    return (preprocessor.random_crop_pad_image,
-            {
-                'min_object_covered': config.min_object_covered,
-                'aspect_ratio_range': (config.min_aspect_ratio,
-                                       config.max_aspect_ratio),
-                'area_range': (config.min_area, config.max_area),
-                'overlap_thresh': config.overlap_thresh,
-                'random_coef': config.random_coef,
-                'min_padded_size_ratio': (min_padded_size_ratio if
-                                          min_padded_size_ratio else None),
-                'max_padded_size_ratio': (max_padded_size_ratio if
-                                          max_padded_size_ratio else None),
-                'pad_color': (pad_color if pad_color else None),
-            })
+    kwargs = {
+        'min_object_covered': config.min_object_covered,
+        'aspect_ratio_range': (config.min_aspect_ratio,
+                               config.max_aspect_ratio),
+        'area_range': (config.min_area, config.max_area),
+        'overlap_thresh': config.overlap_thresh,
+        'random_coef': config.random_coef,
+    }
+    if min_padded_size_ratio:
+      kwargs['min_padded_size_ratio'] = tuple(min_padded_size_ratio)
+    if max_padded_size_ratio:
+      kwargs['max_padded_size_ratio'] = tuple(max_padded_size_ratio)
+    if pad_color:
+      kwargs['pad_color'] = tuple(pad_color)
+    return (preprocessor.random_crop_pad_image, kwargs)
 
   if step_type == 'random_resize_method':
     config = preprocessor_step_config.random_resize_method

research/object_detection/builders/preprocessor_builder_test.py

@@ -274,9 +274,40 @@ class PreprocessorBuilderTest(tf.test.TestCase):
         'area_range': (0.25, 0.875),
         'overlap_thresh': 0.5,
         'random_coef': 0.125,
-        'min_padded_size_ratio': None,
-        'max_padded_size_ratio': None,
-        'pad_color': None,
+    })
+
+  def test_build_random_crop_pad_image_with_optional_parameters(self):
+    preprocessor_text_proto = """
+    random_crop_pad_image {
+      min_object_covered: 0.75
+      min_aspect_ratio: 0.75
+      max_aspect_ratio: 1.5
+      min_area: 0.25
+      max_area: 0.875
+      overlap_thresh: 0.5
+      random_coef: 0.125
+      min_padded_size_ratio: 0.5
+      min_padded_size_ratio: 0.75
+      max_padded_size_ratio: 0.5
+      max_padded_size_ratio: 0.75
+      pad_color: 0.5
+      pad_color: 0.5
+      pad_color: 1.0
+    }
+    """
+    preprocessor_proto = preprocessor_pb2.PreprocessingStep()
+    text_format.Merge(preprocessor_text_proto, preprocessor_proto)
+    function, args = preprocessor_builder.build(preprocessor_proto)
+    self.assertEqual(function, preprocessor.random_crop_pad_image)
+    self.assertEqual(args, {
+        'min_object_covered': 0.75,
+        'aspect_ratio_range': (0.75, 1.5),
+        'area_range': (0.25, 0.875),
+        'overlap_thresh': 0.5,
+        'random_coef': 0.125,
+        'min_padded_size_ratio': (0.5, 0.75),
+        'max_padded_size_ratio': (0.5, 0.75),
+        'pad_color': (0.5, 0.5, 1.0)
     })
 
   def test_build_random_crop_to_aspect_ratio(self):