text: Title: More pre-trained Faster RCNN Model?
  Body: Hi, according to this [page](http://models.tensorpack.com/FasterRCNN)
  
  | COCO-R101C4-MaskRCNN-Standard.npz | 196 MiB | (sha256) |
  | -- | -- | -- |
  | COCO-R50C4-MaskRCNN-Standard.npz | 128 MiB | (sha256)|
  | COCO-R50FPN-MaskRCNN-Standard.npz | 158 MiB | (sha256)|
  | ImageNet-R101-AlignPadding.npz | 158 MiB | (sha256)|
  | ImageNet-R50-AlignPadding.npz | 91 MiB | (sha256)|
  | ImageNet-R50-GroupNorm32-AlignPadding.npz | 88 MiB | (sha256)|
  
  Will you provide more pretrained model such as `COCO-R101FPN` or `COCO-R152FPN`?
  
  Thank you!