'Check input and compute prediction of ``init``.'

def _init_decision_function(self, X):

    self._check_initialized()
    X = self.estimators_[(0, 0)]._validate_X_predict(X, check_input=True)
    if (X.shape[1] != self.n_features_):
        raise ValueError('X.shape[1]    should    be    {0:d},    not    {1:d}.'.format(self.n_features_, X.shape[1]))
    score = self.init_.predict(X).astype(np.float64)
    return score
