Changes

• Fixed max_model_len @openllmai0
• Added support for tokenizer chat templates in train_rm.py and reward_dataset.py. @mickelliu
• Introduced the [--enable_prefix_caching] (https://github.com/OpenLLMAI/OpenRLHF/commit/bbbae8352cdbf26f990885a4e1640e82d0fbeaa8) option. @openllmai0
• Added support for saving the value network with [--save_value_network] (https://github.com/OpenLLMAI/OpenRLHF/commit/e24c53fa2352964cd4638e8ceeede5bd0c6f47ce). @openllmai0
• Supported specifying the number of samples per prompt with --n_samples_per_prompt. @openllmai0