Fix symbolic regression version exactly

juliapkg.json

@@ -3,7 +3,7 @@
     "packages": {
         "SymbolicRegression": {
             "uuid": "8254be44-1295-4e6a-a16d-46603ac705cb",
-            "version": "0.23.1"
+            "version": "=0.23.1"
         },
         "ClusterManagers": {
             "uuid": "34f1f09b-3a8b-5176-ab39-66d58a4d544e",

pysr/julia_helpers.py

@@ -38,17 +38,6 @@ def _escape_filename(filename):
     return str_repr
 
 
-def _backend_version_assertion():
-    backend_version = jl.seval("string(SymbolicRegression.PACKAGE_VERSION)")
-    expected_backend_version = juliapkg.status(target="SymbolicRegression").version
-    if backend_version != expected_backend_version:  # pragma: no cover
-        warnings.warn(
-            f"PySR backend (SymbolicRegression.jl) version {backend_version} "
-            f"does not match expected version {expected_backend_version}. "
-            "Things may break. "
-        )
-
-
 def _load_cluster_manager(cluster_manager):
     jl.seval(f"using ClusterManagers: addprocs_{cluster_manager}")
     return jl.seval(f"addprocs_{cluster_manager}")