remove unused code

deepspeed/inference/v2/modules/implementations/moe/pytorch_multi_gemm.py

@@ -48,29 +48,6 @@ def _activation_reference(out_states: torch.Tensor, act_type: ActivationType) ->
         return act_func_map[act_type](out_states)
 
 
-def _gating_reference(logits: torch.Tensor) -> Tuple[torch.Tensor, torch.Tensor]:
-    """
-    Reference gating code.
-    """
-    logits = logits.float()
-    probs = torch.nn.functional.softmax(logits, dim=1)
-
-    indices1_s = torch.argmax(probs, dim=-1)
-    mask1 = torch.nn.functional.one_hot(indices1_s, num_classes=logits.shape[-1])
-    indices_mask = mask1.sum(dim=1) * logits.shape[-1] - 1
-    indices1_s = torch.min(indices1_s, indices_mask)
-
-    gates1_s = (probs * mask1).sum(dim=1)
-
-    sorted_indices = indices1_s.sort()[1]
-    original_indices = sorted_indices.sort()[1]
-
-    exp_count = torch.bincount(indices1_s, minlength=logits.shape[-1]).long()
-    exp_count_cumsum = exp_count.cumsum(dim=0)
-
-    return sorted_indices, original_indices, exp_count_cumsum, gates1_s
-
-
 @DSMoERegistry.register_module
 class DSPytorchMultiGemmMoE(DSMoEBase):
     """