code: def test_plot(self):
      # TODO: more tests
      y = np.random.randn(100, 24, 1)
      pred = np.random.randn(100, 24, 1)
      x = np.random.randn(100, 48, 1)
      std = np.random.randn(100, 24, 1)
      Evaluator.plot(
          pred,
          x=x,
          ground_truth=y,
          std=std,
          prediction_interval=0.95,
          layout=(3, 4),
          figsize=(16, 8),
      )
  
file_path: BigDL/python/chronos/test/bigdl/chronos/metric/test_forecast_metrics.py
imports: import numpy
  import pytest
  import time
  from unittest import TestCase
  from numpy.testing import assert_almost_equal
  from numpy.testing import assert_array_almost_equal
  from bigdl.chronos.metric.forecast_metrics import Evaluator
  from ..None import op_torch, op_tf2, op_distributed, op_diff_set_all
label_desc: Use image node_id 8 for calling the TestChronosForecastMetrics obj's underlying member method code with example usage: obj.test_plot() without return types