Unable to pull pretrained model from NGC

Since you are running in Google Colab, I can reproduce the same error in Colab while downloading NVIDIA NGC .
Not sure if the ngc is compatible with Google Colab.

For workaround, please use wget to download the model instead of ngc.

For example,

!ngc registry model download-version nvidia/tao/pretrained_object_detection:resnet18
–dest $LOCAL_EXPERIMENT_DIR/pretrained_resnet18

equals to

! wget https://api.ngc.nvidia.com/v2/models/nvidia/tao/pretrained_object_detection/versions/resnet18/files/resnet_18.hdf5

Refer to https://docs.nvidia.com/tao/tao-toolkit/text/open_images/open_images_pt_object_detection.htmlTAO Pretrained Object Detection | NVIDIA NGC

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