Parse Nested Keras Network Configuration

[YuyaKobayashi]

Convertion of
DenseASPP_0_epoch.h5.zip
failed with the below error message.

INFO: Start parsing. Network type:KERAS
INFO: Parsing Keras network.
Traceback (most recent call last):
  File "../dv-sdk/tool/convertor.py", line 134, in <module>
    custom_layer, dim_override)
  File "/home/yuya.kobayashi/git_repo/dv-sdk/tool/cnn_convertor/cnn_parser.py", line 37, in parse_network
    parser_keras.parse_keras_network(network, network_data)
  File "/home/yuya.kobayashi/git_repo/dv-sdk/tool/cnn_convertor/parser_keras.py", line 601, in parse_keras_network
    parse_keras_network2(network, netdef, netweight, need_flip)
  File "/home/yuya.kobayashi/git_repo/dv-sdk/tool/cnn_convertor/parser_keras.py", line 444, in parse_keras_network2
    if is_channel_first:
UnboundLocalError: local variable 'is_channel_first' referenced before assignment

This is because config->layers in the network definetion JSON does not contain layer directly but contain Sequential object that contains layers.