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A simple parser that turns a formulae written in unicode into an ExprGraph
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gorgonia/parser
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The goal of this project is to parse a mathematical formulae written in unicode and to transpile is into anExprGraph of the Gorgonia project.
This parser is generated from ayacc file from the subdirectorysrc.If you want to contribute or add some new functionalities, you may need thegoyacc tool and then rungo generate from thesrc dubdirectory.For a more complete explanation, you can refer to thisblog post
As of today, the parser understands the following opreations on node objects (tensor based):
| Operation | Gorgonia Operation | Symbol | Unicode character |
|---|---|---|---|
| Multiplication | Mul | · | U+00B7 |
| Hadamard Product | HadamardProd | * | |
| Addition | Add | + | |
| Substraction | Sub | - | |
| Pointwise Negation | Neg | - | |
| Sigmoid | Sigmoid | σ | U+03C3 |
| Tanh | Tanh | tanh | |
| Softmax | Softmax | softmax |
import (G"gorgonia.org/gorgonia""github.com/gorgonia/parser""gorgonia.org/tensor")funcmain(){g:=G.NewGraph()wfT:=tensor.New(tensor.WithShape(2,2),tensor.WithBacking([]float32{1,1,1,1}))wf:=G.NewMatrix(g,tensor.Float32,G.WithName("wf"),G.WithShape(2,2),G.WithValue(wfT))htprevT:=tensor.New(tensor.WithBacking([]float32{1,1}),tensor.WithShape(2))htprev:=G.NewVector(g,tensor.Float32,G.WithName("ht-1"),G.WithShape(2),G.WithValue(htprevT))xtT:=tensor.New(tensor.WithBacking([]float32{1,1}),tensor.WithShape(2))xt:=G.NewVector(g,tensor.Float32,G.WithName("xt"),G.WithShape(2),G.WithValue(xtT))bfT:=tensor.New(tensor.WithBacking([]float32{1,1}),tensor.WithShape(2))bf:=G.NewVector(g,tensor.Float32,G.WithName("bf"),G.WithShape(2),G.WithValue(bfT))p:=parser.NewParser(g)p.Set(`Wf`,wf)p.Set(`h`,htprev)p.Set(`x`,xt)p.Set(`bf`,bf)result,_:=p.Parse(`σ(1*Wf·h+ Wf·x+ bf)`)machine:=G.NewLispMachine(g,G.ExecuteFwdOnly())iferr:=machine.RunAll();err!=nil {t.Fatal(err) }res:=result.Value().Data().([]float32)}
- The parser is internally using a
mapand is not concurrent safe. - The errors are not handle correctly