fix tf converter bug

mace/python/tools/tf_converter_lib.py

@@ -406,7 +406,7 @@ class TFConverter(object):
         input_channels = weight_tensor_value.shape[2]
         # HWIO -> OIHW
         weight_tensor_value = weight_tensor_value.transpose(3, 2, 0, 1)
-        if input_shape[2] > 16 and input_shape[3] > 16:
+        if input_shape[1] > 16 and input_shape[2] > 16:
             G = np.array([
                 [1.0, 0.0, 0.0],
                 [-2.0 / 9, -2.0 / 9, -2.0 / 9],