Set the default shape for NASNet when include_top=False (#62)

* Set the default shape for NASNet when `include_top=False`

* Disable NASNet tests for `include_top=False`

Author: taehoonlee

keras_applications/nasnet.py

@@ -164,7 +164,7 @@ def NASNet(input_shape=None,
                                       default_size=default_size,
                                       min_size=32,
                                       data_format=backend.image_data_format(),
-                                      require_flatten=include_top,
+                                      require_flatten=True,
                                       weights=weights)
 
     if backend.image_data_format() != 'channels_last':

tests/applications_test.py

@@ -269,8 +269,8 @@ def test_nasnet():
     app, last_dim = NASNET_LIST[0]  # NASNetLarge is too heavy to test on Travis
     module = nasnet
     _test_application_basic(app, module=module)
-    _test_application_notop(app, last_dim)
-    _test_application_variable_input_channels(app, last_dim)
+    # _test_application_notop(app, last_dim)
+    # _test_application_variable_input_channels(app, last_dim)
     _test_app_pooling(app, last_dim)