added new strip_metadata fn for AbstractPopMember.

Author: atharvas

src/ExpressionBuilder.jl

@@ -153,6 +153,31 @@ function strip_metadata(
 ) where {T,L}
     return with_metadata(ex; init_params(options, dataset, ex, Val(false))...)
 end
+function strip_metadata(
+    member::PM, options::AbstractOptions, dataset::Dataset{T,L}
+) where {T,L,N,PM<:AbstractPopMember{T,L,N}}
+    stripped_tree = strip_metadata(member.tree, options, dataset)
+    new_member = create_child(
+        member,
+        stripped_tree,
+        member.cost,
+        member.loss,
+        options;
+        complexity=nothing,
+        parent_ref=member.parent,
+    )
+    new_member.ref = member.ref
+    new_member.parent = member.parent
+    setfield!(new_member, :complexity, -1)
+
+    for field in fieldnames(PM)
+        if field in (:tree, :cost, :loss, :birth, :complexity, :ref, :parent)
+            continue
+        end
+        setfield!(new_member, field, getfield(member, field))
+    end
+    return new_member
+end
 function strip_metadata(
     member::PopMember, options::AbstractOptions, dataset::Dataset{T,L}
 ) where {T,L}
@@ -166,6 +191,19 @@ function strip_metadata(
         deterministic=options.deterministic,
     )
 end
+function strip_metadata(
+    member::PopMember{T,L,N}, options::AbstractOptions, dataset::Dataset{T,L}
+) where {T,L,N}
+    return PopMember(
+        strip_metadata(member.tree, options, dataset),
+        member.cost,
+        member.loss,
+        nothing;
+        ref=member.ref,
+        parent=member.parent,
+        deterministic=options.deterministic,
+    )
+end
 function strip_metadata(
     pop::Population, options::AbstractOptions, dataset::Dataset{T,L}
 ) where {T,L}

test/test_abstract_popmember.jl

@@ -191,4 +191,12 @@
     @test !isnothing(best_idx)
     best_member = hall_of_fame.members[best_idx]
     @test best_member isa CustomPopMember
+
+    dataset = SymbolicRegression.Dataset(X, y)
+    stripped_member = SymbolicRegression.strip_metadata(best_member, options, dataset)
+    @test stripped_member isa CustomPopMember
+    @test stripped_member !== best_member
+    @test stripped_member.ref == best_member.ref
+    @test stripped_member.parent == best_member.parent
+    @test stripped_member.generation == best_member.generation
 end