Fix: UnboundLocalError for variable 'dim'

Signed-off-by: weeknan <[email protected]>

Author: weeknan

deepspeed/runtime/zero/linear.py

@@ -86,13 +86,13 @@ def backward(ctx, grad_output):
         # improve efficiency. If you want to make your code simpler, you can
         # skip them. Returning gradients for inputs that don't require it is
         # not an error.
+        dim = grad_output.dim()
         if ctx.needs_input_grad[0]:
             #print(f"Computing grad input weight {weight.shape} grad_output {grad_output.shape}")
             grad_input = grad_output.matmul(weight)
             #print(f"Computed grad input {grad_input.shape}")
         if ctx.needs_input_grad[1]:
             #print("Computing grad weight")
-            dim = grad_output.dim()
             if dim > 2:
                 grad_weight = grad_output.reshape(-1,
                                                   grad_output.shape[-1]).t().matmul(input.reshape(-1, input.shape[-1]))