Fix: debug policy load pretrained model failure problem #2073
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What this does
Fixes #2051
How it was tested
this code "policy.from_pretrained(env_cfg.pretrained_policy_name_or_path)" is wrong,because from_pretrained is a classmethod method,It will return a model, but the parameters of the instance it is called on will not be updated.So you need to change it to ”policy = policy.from_pretrained(env_cfg.pretrained_policy_name_or_path)“