fix

colossalai/shardformer/layer/attn.py

@@ -482,7 +482,8 @@ class RingAttention(torch.autograd.Function):
             for i in range(num_rings):
                 for j in range(num_inner_group):
                     # find inner ring group in one sp groups
-                    ranks = list(range(j + i * num_ring_size, j + (i + 1) * num_ring_size, tp_size))
+                    start = j + i * num_ring_size
+                    ranks = list(range(start, start + tp_size * inner_ring_size, tp_size))
                     group = dist.new_group(ranks)
                     if rank in ranks:
                         inner_ring_group = group