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Add D_folded support for jagged_to_padded_dense_backward meta function #3670

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Add D_folded support for jagged_to_padded_dense_backward meta function #3670

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4 changes: 3 additions & 1 deletion fbgemm_gpu/src/jagged_tensor_ops/jagged_tensor_ops_meta.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -56,13 +56,15 @@ Tensor jagged_to_padded_dense_backward_meta(
auto grad_padded_values = grad_output;

at::SymInt D = grad_padded_values.sym_size(-1);
const bool D_folded =
static_cast<size_t>(grad_padded_values.dim()) == offsets.size() + 1;
// Initialize with zeros so output will be zero for the portion truncated
// in forward.
auto grad_values =
at::zeros_symint({total_L, D}, grad_padded_values.options());

TORCH_CHECK(grad_values.is_meta());
return grad_values;
return D_folded ? grad_values.squeeze(-1) : grad_values;
}

Tensor jagged_dense_dense_elementwise_add_jagged_output_forward_meta(
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