delldu commented on a change in pull request #8443:
URL: https://github.com/apache/tvm/pull/8443#discussion_r670541721
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File path: include/tvm/relay/attrs/nn.h
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@@ -1463,6 +1463,21 @@ struct NLLLossAttrs : public
tvm::AttrsNode<NLLLossAttrs> {
}
}; // struct NLLLossAttrs
+/*! \brief Attributes used in Im2col operator */
+struct Im2colAttrs : public tvm::AttrsNode<Im2colAttrs> {
+ Array<IndexExpr> kernel_size;
+ Array<IndexExpr> dilation;
+ Array<IndexExpr> padding;
+ Array<IndexExpr> stride;
Review comment:
Hello @masahi , @wyc-ruiker ,
First all, thank you help us improve PR. Sounds there is one import issue
left, I would give my understanding.
Second, please remember `using IndexExpr = ::tvm::PrimExpr;`
**1. Conclusion**
Changing `Array<IndexExpr>` to` Array<Integer>` in Im2colAttrs is not good.
**2. Function Patch**
inline tvm::te::Tensor im2col(const tvm::te::Tensor& data, ...)
{
auto input_b = data->shape[0];
...
auto kernel_h = tvm::cast(tvm::DataType::Int(32), kernel_size[0]);
...
tvm::Array<tvm::PrimExpr> output_shape;
output_shape.push_back(N);
...
auto pad_value = tvm::tir::make_const(data->dtype, 0);
auto l = [&](tvm::Array<tvm::tir::Var> args) {
...
tvm::PrimExpr s_c = indexdiv(indexdiv(k, kernel_h), kernel_w);
indices.push_back(s_c); // C, source channel
...
return tvm::if_then_else(..., data(indices), pad_value);
};
return tvm::te::compute(output_shape, l, name, tag);
}
**3. Cause analysis**
1) Input
The shape of input data is `Array<PrimExpr>`;
`inline tvm::te::Tensor im2col(const tvm::te::Tensor& data`
2) Output
output shape is also `Array<PrimExpr>`.
`TVM_DLL Tensor compute(Array<PrimExpr> shape, ...);
`
3) Process
3.1) Many expression in lambda function such as indices, are
`Array<PrimExpr>`, NOT `Array<Integer>`.
3.2) Some function parameters are PrimExpr.
For an example: prototye of indexmod is:
```
TVM_DLL PrimExpr indexdiv(PrimExpr a, PrimExpr b, Span span = Span());
```
If we give Integer parameters to indexdiv, only got compile fatal warning
and errors ...
**4. Test Result**
We try to change `Array<IndexExpr>` to `Array<Integer>`, modified related
source code,
fighting again and again, using many methods, finally got many and many
building(compile) errors.
**5. Inference**
`tvm::cast` is good choice than `as_const_int` for parsing parameters.
The reason comes from their prototype
```
inline const *int64_t as_const_int(const PrimExpr& x);
TVM_DLL PrimExpr cast(const DataType& t, PrimExpr value, Span span = Span());
```
Following above results, we could not use `Array<Integer>`.
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