class_docstr: Base class for configuring :class:`SimpleEvaluation` instances.
  
  Args:
      pred_field: the name of the field containing the predicted
          :class:`fiftyone.core.labels.Regression` instances
      gt_field: the name of the field containing the ground truth
          :class:`fiftyone.core.labels.Regression` instances
      metric ("squared_error"): the error metric to use to populate
          sample/frame-level error data. Supported values are
          ``("squared_error", "absolute_error")`` or any function that
          accepts two scalar arguments ``(ypred, ytrue)``
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code: def method(self):
      return "simple"
  
imports: from copy import deepcopy
  import inspect
  import itertools
  import logging
  import numbers
  import numpy
  import sklearn.metrics
  from tabulate import tabulate
  import eta.core.utils
  import fiftyone
  import fiftyone.core.evaluation
  import fiftyone.core.fields
  import fiftyone.core.labels
  import fiftyone.core.plots
  import fiftyone.core.utils
  import fiftyone.core.validation
label_desc: Use image node_id 2 for calling the SimpleEvaluationConfig obj's underlying member method code with example usage: obj.method() and returns: str