[Finetune] use base model mpt-7b instead of mpt-7b-chat (#181)

* use base model mpt-7b instead of mpt-7b-chat

Signed-off-by: minmingzhu <minming.zhu@intel.com>

* manual setting specify tokenizer

Signed-off-by: minmingzhu <minming.zhu@intel.com>

* update

Signed-off-by: minmingzhu <minming.zhu@intel.com>

* update doc/finetune_parameters.md

Signed-off-by: minmingzhu <minming.zhu@intel.com>

---------

Signed-off-by: minmingzhu <minming.zhu@intel.com>

Author: minmingzhu

llm_on_ray/finetune/models/mpt-7b.yaml

@@ -1,7 +1,6 @@
 General:
   base_model: mosaicml/mpt-7b
   tokenizer_name: EleutherAI/gpt-neox-20b
-  is_base_model: false
   gpt_base_model: false
   output_dir: /tmp/llm-ray/output
   checkpoint_dir: /tmp/llm-ray/checkpoint