code: def __init__(self, input_dim, metrics, estimators, n_samples=3):
      self.input_dim = input_dim
      self.metrics = metrics
      self.estimators = estimators
      self.n_samples = n_samples
  
imports: import geomstats.backend
  from geomstats.geometry.stratified.graph_space import ExhaustiveAligner, GraphSpace, _GeodesicToPointAligner
  from geomstats.learning.aac import _AACGGPCA, _AACFrechetMean, _AACRegression
  from geomstats.test.data import TestData
  from geomstats.test.test_case import np_backend
label_desc: Use image node_id 1 to create a new _TrivialRegressionData object  with example: obj = _TrivialRegressionData(input_dim, metrics, estimators, n_samples)