Fixing pylint signature-differs on various methods.

PiperOrigin-RevId: 209193066

Author: afrozenator

tensor2tensor/layers/common_layers.py

@@ -3991,7 +3991,7 @@ def _data_dep_init(self, inputs):
     self.layer.activation = activation
     self.initialized = True
 
-  def build(self, input_shape):
+  def build(self, input_shape=None):
     """Build `Layer`."""
     input_shape = tf.TensorShape(input_shape).as_list()
     self.input_spec = tf.layers.InputSpec(shape=input_shape)

tensor2tensor/models/research/vqa_attention.py

@@ -97,7 +97,7 @@ def body(self, features):
     return tf.expand_dims(tf.expand_dims(output, axis=1), axis=2)
 
   def infer(self,
-            features,
+            features=None,
             decode_length=1,
             beam_size=1,
             top_beams=1,