[TVM Discuss] [Questions] TVM terms: relay, topi, tir, te

[JC Li via TVM Discuss <no...@discuss.tvm.ai>]

I've been studying TVM for quite a few weeks, still not crystal-clear about the relationship between these items: ***relay, tir, topi, te.*** I'll try to summarize my understanding and please correct me in my description below. Thanks in advance. 

1. ***Relay*** 

Relay is the replacement for NNVM, which is a graph optimization toolset. 
It works on tensor expressions (***te***, question: is relay te same as tir te?). 

Input *te* is either extracted from imported trained neural network or manually constructed using relay.\<op>, those are so-called Relay IR, a high-level IR.  

There are certain *attr* are defined or extracted for each relay operator. These attributes are used to later match or find *best* implementations in ***topi*** using so-called FTVMStrategy. 

2. ***tir*** 

Tir is low-level IR before "translating" to target-specific backends. E.g. if x86 is target, then tir is first mapped to llvm IR, then x86 codegen is called to generate target binary. 

3. ***topi***

A bridge between Relay IR and tir. A repository of operator implementations, describing what to compute and how to compute (schedule). The FTVMSTrategy mechanism allows relay operator to be mapped to highest scored implementation.





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[TVM Discuss] [Questions] TVM terms: relay, topi, tir, te

[Cxcxcxcx via TVM Discuss <no...@discuss.tvm.ai>]

Thanks for the summary. I noticed that relay.build runs all the way and runs codegen. Does relay explicitly convert RelayIR to tir? Is there an interface for that? (Presumably, it would be a way to see/debug what relay has done. Or maybe there is a better way to do the debugging?)





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