complete the intro of training

remove virtual joints when write bvh files

add pretrained model

inference on validation set

move normalization to gpu

change the initialization

add validation during train

fix bugs after adding data

add preprocessing script

add data for validation

edit fbx2bvh.py

remove draft.py

remove ./datasets/Mixamo

edit README.md after remove bvh from git

edit README.md after remove bvh from git