modify prompt for new embodiment

[YandanYang]

Hi,
I guess you forget to mention one step to add a new embodiment.

dreamzero/groot/vla/model/dreamzero/transform/dreamzero_cotrain.py

Line 92 in d70a802

def collate(features: List[dict], tokenizer: AutoTokenizer, num_views=3, embodiment_tag_mapping=None) -> dict:

Here the code only support prompt processing for known embodiment.

[ShuaiZhou302]

Hi did you able to fix this? I was trying to transfer to new embodiment following the readme guide but also meet this problem in training