Unify base class using new-style (object).

architectures/tensorflow_components/embedders.py

@@ -17,7 +17,7 @@
 import tensorflow as tf
 
 
-class InputEmbedder:
+class InputEmbedder(object):
     def __init__(self, input_size, activation_function=tf.nn.relu, name="embedder"):
         self.name = name
         self.input_size = input_size

architectures/tensorflow_components/heads.py

@@ -28,7 +28,7 @@ def normalized_columns_initializer(std=1.0):
     return _initializer
 
 
-class Head:
+class Head(object):
     def __init__(self, tuning_parameters, head_idx=0, loss_weight=1., is_local=True):
         self.head_idx = head_idx
         self.name = "head"

architectures/tensorflow_components/middleware.py

@@ -18,7 +18,7 @@ import tensorflow as tf
 import numpy as np
 
 
-class MiddlewareEmbedder:
+class MiddlewareEmbedder(object):
     def __init__(self, activation_function=tf.nn.relu, name="middleware_embedder"):
         self.name = name
         self.input = None