Upload alpha_factory/deterministic/expression_mutator.py

alpha_factory/deterministic/expression_mutator.py

@@ -116,16 +116,13 @@ def mutate_vol_scale(expression: str) -> list[dict]:
 
 def mutate_sign_flip(expression: str) -> list[dict]:
     """Flip the sign of the entire expression (test opposite direction)."""
-    # Remove existing negation or add one
-    inner = expression
-    
     # Extract inner from ts_decay_linear wrapper
     match = re.match(r"ts_decay_linear\((.+),\s*(\d+)\)$", expression)
     if match:
         inner_expr = match.group(1).strip()
         decay = match.group(2)
         
-        if inner_expr.startswith("-(") and inner_expr.endswith(")"):
+        if inner_expr.startswith("-(" ) and inner_expr.endswith(")"):
             # Remove negation
             flipped = inner_expr[2:-1]
         else: