[Misc] Remove Mixtral device="cuda" declarations (vllm-project#4543)

Remove the device="cuda" declarations in mixtral as promised in vllm-project#4343

vllm/model_executor/models/mixtral.py

@@ -96,13 +96,11 @@ def __init__(
             torch.empty(self.num_total_experts,
                         2 * self.intermediate_size,
                         self.hidden_size,
-                        device="cuda",
                         dtype=self.params_dtype))
         self.w2s = nn.Parameter(
             torch.empty(self.num_total_experts,
                         self.hidden_size,
                         self.intermediate_size,
-                        device="cuda",
                         dtype=self.params_dtype))
 
         set_weight_attrs(self.ws, {
@@ -114,22 +112,20 @@ def __init__(
 
         # Scaling factors for FP8 weights
         self.ws_scale = nn.Parameter(
-            torch.ones(
-                self.num_total_experts, device="cuda", dtype=torch.float32),
+            torch.ones(self.num_total_experts, dtype=torch.float32),
             requires_grad=False) if self.use_fp8 else None
         self.w2s_scale = nn.Parameter(
-            torch.ones(
-                self.num_total_experts, device="cuda", dtype=torch.float32),
+            torch.ones(self.num_total_experts, dtype=torch.float32),
             requires_grad=False) if self.use_fp8 else None
 
         # Scaling factors for FP8 activations
         need_act_scales = (self.use_fp8
                            and quant_config.activation_scheme == "static")
         self.as_scale = nn.Parameter(
-            torch.zeros(1, device="cuda", dtype=torch.float32),
+            torch.zeros(1, dtype=torch.float32),
             requires_grad=False) if need_act_scales else None
         self.a2s_scale = nn.Parameter(
-            torch.zeros(1, device="cuda", dtype=torch.float32),
+            torch.zeros(1, dtype=torch.float32),
             requires_grad=False) if need_act_scales else None
 
         if need_act_scales: