Create a DecisionTreeRegressor class in the file tree.py and must code the functions above. You may add additional necessary functions if needed. You can use any dataset to test the class.

class DecisionTreeRegressor: def init_(self, max_depth): pass def fit (self, x: pd.DataFrame, y: np.array): pass def predict (self, X): pass def score (self): pass class DecisionTreeRegressor: def init_(self, max_depth): pass def fit (self, x: pd.DataFrame, y: np.array): pass def predict (self, X): pass def score (self): pass