Adding support for Abs (#109)

Author: dstarkenburg

src/load.jl

@@ -55,6 +55,11 @@ function load_node!(tape::Tape, ::OpConfig{:ONNX, :Cos}, args::VarVec, attrs::At
     return push_call!(tape, _cos, args[1])
 end
 
+function load_node!(tape::Tape, ::OpConfig{:ONNX, :Abs}, args::VarVec, attrs::AttrDict)
+    return push_call!(tape, _abs, args[1])
+end
+
+
 function load_node!(tape::Tape, nd::NodeProto, backend::Symbol)
     args = [tape.c.name2var[name] for name in nd.input]
     attrs = convert(Dict{Symbol, Any}, Dict(nd.attribute))

src/ops.jl

@@ -49,6 +49,7 @@ add(xs...) = .+(xs...)
 sub(xs...) = .-(xs...)
 _sin(x) = sin.(x)
 _cos(x) = cos.(x)
+_abs(x) = abs.(x)
 mul(xs...) = .*(xs...)
 relu(x) = NNlib.relu.(x)
 leakyrelu(x;a = 0.01) = NNlib.leakyrelu.(x,a)

src/save.jl

@@ -121,6 +121,11 @@ function save_node!(g::GraphProto, ::OpConfig{:ONNX, typeof(_cos)}, op::Umlaut.C
     push!(g.node, nd)
 end
 
+function save_node!(g::GraphProto, ::OpConfig{:ONNX, typeof(_abs)}, op::Umlaut.Call)
+    nd = NodeProto("Abs", op)
+    push!(g.node, nd)
+end
+
 function save_node!(g::GraphProto, ::OpConfig{:ONNX, typeof(*)}, op::Umlaut.Call)
     nd = NodeProto(
         input=[onnx_name(v) for v in reverse(op.args)],

test/saveload.jl

@@ -31,6 +31,11 @@ import ONNX: NodeProto, ValueInfoProto, AttributeProto, onnx_name
         ort_test(ONNX._cos, A)
     end
 
+    @testset "Abs" begin
+        A = rand(3, 4)
+        ort_test(ONNX._abs, A)
+    end
+
     @testset "Gemm" begin
         A, B, C = (rand(3, 4), rand(3, 4), rand(3, 3))
         ort_test(ONNX.onnx_gemm, A, B')