dipu rms norm init: add_unit_offset param

deeplink_ext/interntrain_ops/_mixed_rms_norm_dipu.py

@@ -95,7 +95,7 @@ def backward(ctx, grad_output):
 
 class MixedFusedRMSNorm(torch.nn.Module):
 
-    def __init__(self, normalized_shape, eps=1e-5):
+    def __init__(self, normalized_shape, eps=1e-5, add_unit_offset=False):
         # TODO: Further optimization when there are device and dtype available.
         # factory_kwargs = {"device": device, "dtype": dtype}
         factory_kwargs = {}
@@ -105,6 +105,8 @@ def __init__(self, normalized_shape, eps=1e-5):
         self.normalized_shape = torch.Size(normalized_shape)
         self.weight = torch.nn.Parameter(torch.ones(normalized_shape, **factory_kwargs))
         self.eps = eps
+        self.add_unit_offset = add_unit_offset
+        self.reset_parameters()
 
     def forward(self, hidden_states):
         return _MixedFusedRMSNormFunction.apply(
@@ -115,7 +117,10 @@ def forward(self, hidden_states):
         )
 
     def reset_parameters(self):
-        init.ones_(self.weight)
+        if self.add_unit_offset:
+            init.zeros_(self.weight)
+        else:
+            init.ones_(self.weight)
 
     def extra_repr(self):
         return "{normalized_shape}, eps={eps}, ".format(**self.__dict__)