add missing file

tensorpack/callbacks/dispatcher.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# File: dispatcher.py
+# Author: Yuxin Wu <ppwwyyxxc@gmail.com>
+from ..tfutils.common import get_op_tensor_name
+
+__all__ = ['OutputTensorDispatcer']
+
+class OutputTensorDispatcer(object):
+    def __init__(self):
+        self._names = []
+        self._idxs = []
+
+    def add_entry(self, names):
+        v = []
+        for n in names:
+            tensorname = get_op_tensor_name(n)[1]
+            if tensorname in self._names:
+                v.append(self._names.index(tensorname))
+            else:
+                self._names.append(tensorname)
+                v.append(len(self._names) - 1)
+        self._idxs.append(v)
+
+    def get_all_names(self):
+        return self._names
+
+    def get_idx_for_each_entry(self):
+        return self._idxs