[GitHub] [incubator-tvm] SWu opened a new issue #4519: [Relay] VM executor doesn't work with higher order gradient function

[GitBox <gi...@apache.org>]

SWu opened a new issue #4519: [Relay] VM executor doesn't work with higher order gradient function
URL: https://github.com/apache/incubator-tvm/issues/4519
 
 
   I'm using the 0.6.0 release of TVM, and functions generated by `relay.transform.gradient()` in higher order mode break with the following cryptic message when running in a VM executor:
   
   ```
   tvm._ffi.base.TVMError: Traceback (most recent call last):
     [bt] (8) /usr/tvm/build/libtvm.so(tvm::relay::ExprFunctor<void (tvm::relay::Expr const&)>::VisitExpr(tvm::relay::Expr const&)+0x8a) [0x7f95e58a7d0a]
     [bt] (7) /usr/tvm/build/libtvm.so(tvm::relay::vm::VMFunctionCompiler::VisitExpr_(tvm::relay::LetNode const*)+0x76) [0x7f95e5a27666]
     [bt] (6) /usr/tvm/build/libtvm.so(tvm::relay::ExprFunctor<void (tvm::relay::Expr const&)>::VisitExpr(tvm::relay::Expr const&)+0x8a) [0x7f95e58a7d0a]
     [bt] (5) /usr/tvm/build/libtvm.so(tvm::relay::vm::VMFunctionCompiler::VisitExpr_(tvm::relay::LetNode const*)+0x76) [0x7f95e5a27666]
     [bt] (4) /usr/tvm/build/libtvm.so(tvm::relay::ExprFunctor<void (tvm::relay::Expr const&)>::VisitExpr(tvm::relay::Expr const&)+0x8a) [0x7f95e58a7d0a]
     [bt] (3) /usr/tvm/build/libtvm.so(tvm::relay::vm::VMFunctionCompiler::VisitExpr_(tvm::relay::LetNode const*)+0x26) [0x7f95e5a27616]
     [bt] (2) /usr/tvm/build/libtvm.so(tvm::relay::ExprFunctor<void (tvm::relay::Expr const&)>::VisitExpr(tvm::relay::Expr const&)+0x8a) [0x7f95e58a7d0a]
     [bt] (1) /usr/tvm/build/libtvm.so(tvm::relay::ExprFunctor<void (tvm::relay::Expr const&)>::VisitExprDefault_(tvm::runtime::Object const*)+0x71) [0x7f95e58a61e1]
     [bt] (0) /usr/tvm/build/libtvm.so(dmlc::LogMessageFatal::~LogMessageFatal()+0x32) [0x7f95e5378a32]
     File "/usr/tvm/include/tvm/relay/expr_functor.h", line 120
   TVMError: Do not have a default for relay.RefCreate
   ```
   
   I'm not sure what exactly is missing in the VM implementation to support this; is there already an issue tracking what is needed for full support of executing Relay functions in the VM? In the meantime, should `relay.transform.gradient` default to `mode="first_order"` to reduce confusion by people trying to run those results in an executor?

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