Fix pkv dtype (huggingface#481)

* pkv dtype

* fix dtype

optimum/intel/generation/modeling.py

@@ -44,12 +44,24 @@
 logger = logging.getLogger(__name__)
 
 
+def get_float_type(model_dtype: torch.dtype):
+    if model_dtype == torch.bfloat16:
+        return "bf16"
+    elif model_dtype == torch.float16:
+        return "fp16"
+    else:
+        return "fp32"
+
+
 def prepare_jit_inputs(model: PreTrainedModel, task: str, use_cache: bool = False):
     task = _TASK_ALIASES.get(task, task)
     signature = inspect.signature(model.forward) if hasattr(model, "forward") else inspect.signature(model.__call__)
     onnx_config_class = TasksManager.get_exporter_config_constructor(model=model, exporter="onnx", task=task)
+    float_dtype = get_float_type(model.dtype)
     if "text-generation" in task:
-        onnx_config = onnx_config_class(model.config, use_past=use_cache, use_past_in_inputs=use_cache)
+        onnx_config = onnx_config_class(
+            model.config, use_past=use_cache, use_past_in_inputs=use_cache, float_dtype=float_dtype
+        )
     else:
         onnx_config = onnx_config_class(model.config)