code: def rmse_func(y, predictions):
      return mean_squared_error(y, predictions) ** 0.5
  
imports: from collections import OrderedDict
  import math
  from auto_ml import utils
  import pandas
  from sklearn.ensemble import GradientBoostingRegressor, GradientBoostingClassifier
  from sklearn.metrics import mean_squared_error, make_scorer, brier_score_loss, accuracy_score, explained_variance_score, mean_absolute_error, median_absolute_error, r2_score, log_loss, roc_auc_score
  import numpy
  from tabulate import tabulate
label_desc: Use image node_id 4 for calling a global function with example usage: rmse_func(y, predictions) and returns: unknown