name scope of StagingInput: use the one in _setup

requirements.txt

@@ -3,7 +3,7 @@ six
 termcolor>=1.1
 tabulate>=0.7.7
 tqdm>4.11.1
-msgpack-python>0.4.0
+msgpack
 msgpack-numpy>=0.3.9
 pyzmq>=16
 subprocess32; python_version < '3.0'

tensorpack/input_source/input_source.py

@@ -520,6 +520,8 @@ class StagingInput(FeedfreeInput):
 
     def _setup(self, inputs):
         self._input.setup(inputs)
+        with self.cached_name_scope():
+            pass    # just to cache the correct ns to use
 
     def _get_callbacks(self):
         cbs = self._input.get_callbacks()

tensorpack/input_source/input_source_base.py

@@ -165,7 +165,7 @@ class InputSource(object):
             with tf.name_scope(self._name_scope):
                 yield self._name_scope
         else:
-            name = type(self).__name__ + '/'
+            name = type(self).__name__
             with tf.name_scope(name) as ns:
                 self._name_scope = ns
                 yield ns