Update config.json

config.json

@@ -30,5 +30,5 @@
         "AutoModel": "modeling_opt.OPTModel", 
         "AutoModelForCausalLM": "modeling_opt.OPTForCausalLM"
       }, 
-  "_attn_implementation":"out_eff_hop"
+  "attn_implementation":"out_eff_hop"
 }