Adding support for Where (#117)

* Adding support for Where

* Changes

Author: dstarkenburg

src/load.jl

@@ -83,6 +83,10 @@ function load_node!(tape::Tape, ::OpConfig{:ONNX, :Expand}, args::VarVec, attrs:
     return push_call!(tape, expand, args...)
 end
 
+function load_node!(tape::Tape, ::OpConfig{:ONNX, :Where}, args::VarVec, attrs::AttrDict)
+    return push_call!(tape, _where, args...)
+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

@@ -67,6 +67,11 @@ function expand(x, y)
     # note: order of arguments reversed due to row-major layout
     return shape .* x
 end
+
+function _where(condition, x, y)
+    return ifelse.(condition, x, y)
+end
+
 add(xs...) = .+(xs...)
 sub(xs...) = .-(xs...)
 _sin(x) = sin.(x)

src/save.jl

@@ -156,6 +156,11 @@ function save_node!(g::GraphProto, ::OpConfig{:ONNX, typeof(expand)}, op::Umlaut
     push!(g.node, nd)
 end
 
+function save_node!(g::GraphProto, ::OpConfig{:ONNX, typeof(_where)}, op::Umlaut.Call)
+    nd = NodeProto("Where", 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

@@ -113,6 +113,13 @@ import ONNX: NodeProto, ValueInfoProto, AttributeProto, onnx_name
         @test size(play!(tape, args...)) == (5, 20)
     end
 
+    @testset "Where" begin
+        condition = rand(Bool, (1,20))
+        A = rand(1,20)
+        B = rand(1,20)
+        ort_test(ONNX._where, condition, A, B)
+    end
+
     @testset "Gemm" begin
         A, B, C = (rand(3, 4), rand(3, 4), rand(3, 3))
         ort_test(ONNX.onnx_gemm, A, B')