Fix RLHF llama rewarding modeling backward issue (huggingface#612)

optimum/habana/transformers/models/llama/modeling_llama.py

@@ -102,7 +102,7 @@ def __init__(self, config: LlamaConfig):
         self.past_key = None
         self.past_value = None
         self.inp_seq_len = -1
-        self.register_buffer("norm_factor", torch.tensor(1.0 / math.sqrt(self.head_dim)), persistent=False)
+        self.norm_factor = 1.0 / math.sqrt(self.head_dim)
 
     def allocate_kv_cache(self, batch_size, max_seq_len, inp_seq_len, kv_cache_fp8):
         key_shape = (batch_size, self.num_key_value_heads, max_seq_len, self.head_dim)