A collection of verified code in different frameworks, that reproduces several experiment results in the paper:

Reproduced Experiments from the Paper:

Object Detection with Mask R-CNN, in Caffe2, with models. Official models for the paper.
ImageNet Classification with ResNet-50, in TensorFlow, with models. Exactly reproduce.
ImageNet Classification with ResNet-50, in PyTorch, with models. 0.1% different result due to fewer augmentations.
ImageNet Classification with VGG-16, in TensorFlow. Exactly reproduce.
Object Detection with Mask R-CNN, in TensorFlow, with models. Slighly better results due to different implementation of Mask R-CNN framework.
Object Detection with Mask R-CNN, in PyTorch, with models. Slighly better results due to different implementation of Mask R-CNN framework.

Not in the Paper