Unify base class using new-style (object).

architectures/neon_components/embedders.py

@@ -19,7 +19,7 @@ import ngraph as ng
 from ngraph.util.names import name_scope
 
 
-class InputEmbedder:
+class InputEmbedder(object):
     def __init__(self, input_size, batch_size=None, activation_function=neon.Rectlin(), name="embedder"):
         self.name = name
         self.input_size = input_size

architectures/neon_components/heads.py

@@ -22,7 +22,7 @@ from utils import force_list
 from architectures.neon_components.losses import *
 
 
-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/neon_components/middleware.py

@@ -20,7 +20,7 @@ from ngraph.util.names import name_scope
 import numpy as np
 
 
-class MiddlewareEmbedder:
+class MiddlewareEmbedder(object):
     def __init__(self, activation_function=neon.Rectlin(), name="middleware_embedder"):
         self.name = name
         self.input = None