leezu commented on issue #19686:
URL:
https://github.com/apache/incubator-mxnet/issues/19686#issuecomment-747516087
```
the input must be a single tensor of interleaved projections
of queries, keys and values following the layout:
(seq_length, batch_size, num_heads * head_dim * 3)
```
you are using a `0` shape tensor as `num_heads=0`. It's not supported in
`mx.nd` interface..
We can track improving the error message
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