Internal change

PiperOrigin-RevId: 462680315

official/projects/yt8m/modeling/yt8m_model.py

@@ -65,12 +65,11 @@ class DbofModel(tf.keras.Model):
       norm_epsilon: A `float` added to variance to avoid dividing by zero.
       **kwargs: keyword arguments to be passed.
     """
-
+    del num_frames
     self._self_setattr_tracking = False
     self._config_dict = {
         "input_specs": input_specs,
         "num_classes": num_classes,
-        "num_frames": num_frames,
         "params": params
     }
     self._num_classes = num_classes
@@ -80,26 +79,23 @@ class DbofModel(tf.keras.Model):
       self._norm = layers.experimental.SyncBatchNormalization
     else:
       self._norm = layers.BatchNormalization
-    if tf.keras.backend.image_data_format() == "channels_last":
-      bn_axis = -1
-    else:
-      bn_axis = 1
 
+    bn_axis = -1
     # [batch_size x num_frames x num_features]
     feature_size = input_specs.shape[-1]
     # shape 'excluding' batch_size
     model_input = tf.keras.Input(shape=self._input_specs.shape[1:])
-    reshaped_input = tf.reshape(model_input, [-1, feature_size])
     tf.summary.histogram("input_hist", model_input)
+    input_data = model_input
 
     # configure model
     if params.add_batch_norm:
-      reshaped_input = self._norm(
+      input_data = self._norm(
           axis=bn_axis,
           momentum=norm_momentum,
           epsilon=norm_epsilon,
           name="input_bn")(
-              reshaped_input)
+              input_data)
 
     # activation = reshaped input * cluster weights
     if params.cluster_size > 0:
@@ -108,7 +104,7 @@ class DbofModel(tf.keras.Model):
           kernel_regularizer=kernel_regularizer,
           kernel_initializer=tf.random_normal_initializer(
               stddev=1 / tf.sqrt(tf.cast(feature_size, tf.float32))))(
-                  reshaped_input)
+                  input_data)
 
     if params.add_batch_norm:
       activation = self._norm(
@@ -142,7 +138,7 @@ class DbofModel(tf.keras.Model):
           pooling_method=pooling_method,
           hidden_layer_size=params.context_gate_cluster_bottleneck_size,
           kernel_regularizer=kernel_regularizer)
-    activation = tf.reshape(activation, [-1, num_frames, params.cluster_size])
+
     activation = utils.frame_pooling(activation, params.pooling_method)
 
     # activation = activation * hidden1_weights

official/projects/yt8m/modeling/yt8m_model_test.py

@@ -34,7 +34,7 @@ class YT8MNetworkTest(parameterized.TestCase, tf.test.TestCase):
       num_frames: number of frames.
       feature_dims: indicates total dimension size of the features.
     """
-    input_specs = tf.keras.layers.InputSpec(shape=[num_frames, feature_dims])
+    input_specs = tf.keras.layers.InputSpec(shape=[None, None, feature_dims])
 
     num_classes = 3862
     model = yt8m_model.DbofModel(
@@ -44,7 +44,7 @@ class YT8MNetworkTest(parameterized.TestCase, tf.test.TestCase):
         input_specs=input_specs)
 
     # batch = 2 -> arbitrary value for test
-    inputs = np.random.rand(2 * num_frames, feature_dims)
+    inputs = np.random.rand(2, num_frames, feature_dims)
     logits = model(inputs)
     self.assertAllEqual([2, num_classes], logits.numpy().shape)