[inference/model]Adapted to the baichuan2-7B model (#5591)

* Adapted to the baichuan2-7B model

* modified according to the review comments.

* Modified the method of obtaining random weights.

* modified according to the review comments.

* change mlp layewr 'NOTE'

colossalai/inference/modeling/models/nopadding_llama.py

@@ -479,7 +479,7 @@ class NopadLlamaAttention(LlamaAttention):
         return attn_output
 
 
-# NOTE This will cause the result to be different from the transformer in some cases.
+# NOTE This will cause difference as out length increases.
 class NopadLlamaMLP(LlamaMLP):
     def __init__(
         self,