experiments (#1)

Co-authored-by: Anton Reinhard <anton.reinhard@proton.me>
Reviewed-on: #1

src/optimization/fuse.jl

@@ -0,0 +1,36 @@
+"""
+    FusionOptimizer
+
+An optimizer that simply applies an available [`NodeFusion`](@ref) on each step. It implements [`optimize_to_fixpoint`](@ref). The fixpoint is reached when there are no more possible [`NodeFusion`](@ref)s in the graph.
+
+See also: [`SplitOptimizer`](@ref), [`ReductionOptimizer`](@ref)
+"""
+struct FusionOptimizer <: AbstractOptimizer end
+
+function optimize_step!(optimizer::FusionOptimizer, graph::DAG)
+    # generate all options
+    operations = get_operations(graph)
+    if fixpoint_reached(optimizer, graph)
+        return false
+    end
+
+    push_operation!(graph, first(operations.nodeFusions))
+
+    return true
+end
+
+function fixpoint_reached(optimizer::FusionOptimizer, graph::DAG)
+    operations = get_operations(graph)
+    return isempty(operations.nodeFusions)
+end
+
+function optimize_to_fixpoint!(optimizer::FusionOptimizer, graph::DAG)
+    while !fixpoint_reached(optimizer, graph)
+        optimize_step!(optimizer, graph)
+    end
+    return nothing
+end
+
+function String(::FusionOptimizer)
+    return "fusion_optimizer"
+end