code: def __init__(self, x):
      self.x = x
  
file_path: mlflow/examples/evaluation/evaluate_with_custom_metrics_comprehensive.py
imports: import matplotlib.pyplot
  import numpy
  import pandas
  from sklearn.datasets import fetch_california_housing
  from sklearn.linear_model import LinearRegression
  from sklearn.model_selection import train_test_split
  import mlflow
  from mlflow.models import infer_signature, make_metric
label_desc: Use image node_id 1 to create a new ExampleClass object  with example: obj = ExampleClass(x)