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Posted to discuss-archive@tvm.apache.org by KireinaHoro via TVM Discuss <no...@discuss.tvm.ai> on 2020/05/17 03:59:58 UTC
[TVM Discuss] [Questions] C target for Relay?
I'm wondering if it's possible to use C backend for Relay frontend. I'm trying to compile Relay models to MicroTVM targets by using `target="c"` in `tutorials/tune_relay_x86.py`, and I'm running into this obscure trace during tuning:
```
Traceback (most recent call last):
[bt] (8) /home/jsteward/work/tvm/build/libtvm.so(tvm::NodeFunctor<void (tvm::runtime::ObjectRef const&, tvm::ir::StmtFunctor<void (tvm::Stmt const&)>*)>::operator()(tvm::runtime::ObjectRef const&, tvm::ir::StmtFunctor<void (tvm::Stmt const&)>*) const+0x52) [0x7f1e1fab0802]
[bt] (7) /home/jsteward/work/tvm/build/libtvm.so(tvm::codegen::CodeGenC::VisitStmt_(tvm::ir::Block const*)+0x1c) [0x7f1e1faa277c]
[bt] (6) /home/jsteward/work/tvm/build/libtvm.so(tvm::NodeFunctor<void (tvm::runtime::ObjectRef const&, tvm::ir::StmtFunctor<void (tvm::Stmt const&)>*)>::operator()(tvm::runtime::ObjectRef const&, tvm::ir::StmtFunctor<void (tvm::Stmt const&)>*) const+0x52) [0x7f1e1fab0802]
[bt] (5) /home/jsteward/work/tvm/build/libtvm.so(tvm::codegen::CodeGenC::VisitStmt_(tvm::ir::Store const*)+0x317) [0x7f1e1faab217]
[bt] (4) /home/jsteward/work/tvm/build/libtvm.so(tvm::codegen::CodeGenC::PrintExpr[abi:cxx11](tvm::Expr const&)+0x19b) [0x7f1e1fab709b]
[bt] (3) /home/jsteward/work/tvm/build/libtvm.so(tvm::codegen::CodeGenC::PrintExpr(tvm::Expr const&, std::ostream&)+0x99) [0x7f1e1faa5039]
[bt] (2) /home/jsteward/work/tvm/build/libtvm.so(tvm::codegen::CodeGenCHost::VisitExpr_(tvm::ir::Broadcast const*, std::ostream&)+0x56) [0x7f1e1faba9d6]
[bt] (1) /home/jsteward/work/tvm/build/libtvm.so(tvm::codegen::CodeGenCHost::PrintType(tvm::DataType, std::ostream&)+0x14a) [0x7f1e1faba57a]
[bt] (0) /home/jsteward/work/tvm/build/libtvm.so(dmlc::LogMessageFatal::~LogMessageFatal()+0x43) [0x7f1e1f95b4a3]
File "../src/codegen/codegen_c_host.cc", line 143
TVMError: Cannot convert type float32x64 to C type
```
I've looked around and thought that `float32x64` might be SIMD-related, but I don't have any clues on how to disable SIMD in this case. Any help would be appreciated.
---
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[TVM Discuss] [Questions] C target for Relay?
Posted by Huang Guangtai via TVM Discuss <no...@discuss.tvm.ai>.
```python
with tvm.target.build_config(disable_vectorize=True):
graph, c_mod, params = relay.build(func, target="c", params=params)
```
Hi, how about try to disable vectorize?
---
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[TVM Discuss] [Questions] C target for Relay?
Posted by KireinaHoro via TVM Discuss <no...@discuss.tvm.ai>.
Current MicroTVM implementation seems to limit to C backends for the devices. In this case, I wonder if we're relying on LLVM's ability to flatten out SIMD types (such as the `<64 x f32>` type corresponding to the `float32x64`) to scalar types when SIMD is not enabled. Shall this be fixed from Relay, or shall we bring LLVM support to MicroTVM?
Cc @weberlo @tqchen
---
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