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Problem to train densenet and mobilenet models

See original GitHub issue

When I use any model of resnet or vgg I have no problem, but when I try to test the densenet or mobilenet models the following problems arise:

keras-retinanet/keras_retinanet/bin/train.py --backbone=densenet201 --epochs=1 --steps=1 --no-weights coco /home/manuelvazquezenriquez2/keras-retinanet-test-data/coco

loading annotations into memory...
Done (t=0.00s)
creating index...
index created!
loading annotations into memory...
Done (t=0.00s)
creating index...
index created!
Creating model, this may take a second...
Traceback (most recent call last):
  File "keras-retinanet/keras_retinanet/bin/train.py", line 493, in <module>
    main()
  File "keras-retinanet/keras_retinanet/bin/train.py", line 461, in main
    config=args.config
  File "keras-retinanet/keras_retinanet/bin/train.py", line 118, in create_models
    model          = model_with_weights(backbone_retinanet(num_classes, num_anchors=num_anchors, modifier=modifier), weights=weights, skip_mismatch=True)
  File "keras-retinanet/keras_retinanet/bin/../../keras_retinanet/models/densenet.py", line 35, in retinanet
    return densenet_retinanet(*args, backbone=self.backbone, **kwargs)
  File "keras-retinanet/keras_retinanet/bin/../../keras_retinanet/models/densenet.py", line 85, in densenet_retinanet
    backbone = densenet.DenseNet(blocks=blocks, input_tensor=inputs, include_top=False, pooling=None, weights=None)
  File "/home/manuelvazquezenriquez2/.local/lib/python2.7/site-packages/keras_applications/densenet.py", line 193, in DenseNet
    data_format=backend.image_data_format(),
AttributeError: 'NoneType' object has no attribute 'image_data_format'

keras-retinanet/keras_retinanet/bin/train.py --backbone=mobilenet128 --epochs=1 --steps=1 --no-weights coco /home/manuelvazquezenriquez2/keras-retinanet-test-data/coco

loading annotations into memory...
Done (t=0.00s)
creating index...
index created!
loading annotations into memory...
Done (t=0.00s)
creating index...
index created!
Creating model, this may take a second...
Traceback (most recent call last):
  File "keras-retinanet/keras_retinanet/bin/train.py", line 493, in <module>
    main()
  File "keras-retinanet/keras_retinanet/bin/train.py", line 461, in main
    config=args.config
  File "keras-retinanet/keras_retinanet/bin/train.py", line 118, in create_models
    model          = model_with_weights(backbone_retinanet(num_classes, num_anchors=num_anchors, modifier=modifier), weights=weights, skip_mismatch=True)
  File "keras-retinanet/keras_retinanet/bin/../../keras_retinanet/models/mobilenet.py", line 35, in retinanet
    return mobilenet_retinanet(*args, backbone=self.backbone, **kwargs)
  File "keras-retinanet/keras_retinanet/bin/../../keras_retinanet/models/mobilenet.py", line 92, in mobilenet_retinanet
    alpha = float(backbone.split('_')[1])
IndexError: list index out of range

Any idea why it can be? Thanks