fix fpgm prune criterion bug test=develop (#234)

paddleslim/prune/criterion.py

@@ -63,7 +63,7 @@ def geometry_median(group, graph):
     x = w.repeat(channel_num, axis=0)
     y = np.zeros_like(x)
     for i in range(channel_num):
-        y[i * channel_num:(i + 1) * channel_num] = np.tile(channel_num,
+        y[i * channel_num:(i + 1) * channel_num] = np.tile(w[i],
                                                            (channel_num, 1))
     tmp = np.sqrt(np.sum((x - y)**2, -1))
     tmp = tmp.reshape((channel_num, channel_num))