fix

colossalai/booster/plugin/low_level_zero_plugin.py

@@ -63,7 +63,7 @@ class OptimizerParamCheckState(enum.Enum):
 
 class LowLevelZeroModel(ModelWrapper, AMPModelMixin):
     def __init__(
-        self, module: nn.Module, precision: str, overlap_allgather: bool = False, use_fp8: bool = False
+        self, module: nn.Module, precision: str, overlap_allgather: bool = False, cast_inputs: bool = True, use_fp8: bool = False
     ) -> None:
         super().__init__(module)
         self.dtype = None
@@ -77,7 +77,7 @@ class LowLevelZeroModel(ModelWrapper, AMPModelMixin):
         self.module = module
         self.convert_fn = None
         self.use_fp8 = use_fp8
-        if self.dtype is not None:
+        if self.dtype is not None and cast_inputs:
             self.convert_fn = partial(_convert_floating_point, dtype=self.dtype)
         self.overlap_allgather = overlap_allgather
         self.op_hooks = []
@@ -342,6 +342,7 @@ class LowLevelZeroPlugin(DPPluginBase):
         cpu_offload: bool = False,
         master_weights: bool = True,
         verbose: bool = False,
+        cast_inputs: bool = True,
         fp8_communication: bool = False,
         use_fp8: bool = False,
     ) -> None:
@@ -372,6 +373,8 @@ class LowLevelZeroPlugin(DPPluginBase):
         self.lora_enabled = False
         self.verbose = verbose
         self.logger = get_dist_logger()
+        self.cast_inputs = cast_inputs
+
         self.use_fp8 = use_fp8
         # set class name with stage, for better error message
         setattr(self.__class__, "__name__", f"LowLevelZeroPlugin_ZeRO-{stage}")
@@ -490,6 +493,7 @@ class LowLevelZeroPlugin(DPPluginBase):
                 model,
                 self.precision,
                 overlap_allgather=self.zero_optim_kwargs["overlap_allgather"],
+                cast_inputs=self.cast_inputs,
                 use_fp8=self.use_fp8,
             )