@java.lang.Override
  public double getApproximationError() {
    return approximationError_;
  }
<pre>
Output only. Error of
[feature_attributions][google.cloud.aiplatform.v1.Attribution.feature_attributions]
caused by approximation used in the explanation method. Lower value means
more precise attributions.

* For Sampled Shapley
[attribution][google.cloud.aiplatform.v1.ExplanationParameters.sampled_shapley_attribution],
increasing
[path_count][google.cloud.aiplatform.v1.SampledShapleyAttribution.path_count]
might reduce the error.
* For Integrated Gradients
[attribution][google.cloud.aiplatform.v1.ExplanationParameters.integrated_gradients_attribution],
increasing
[step_count][google.cloud.aiplatform.v1.IntegratedGradientsAttribution.step_count]
might reduce the error.
* For [XRAI
attribution][google.cloud.aiplatform.v1.ExplanationParameters.xrai_attribution],
increasing
[step_count][google.cloud.aiplatform.v1.XraiAttribution.step_count] might
reduce the error.

See [this introduction](/vertex-ai/docs/explainable-ai/overview)
for more information.
</pre>

<code>double approximation_error = 6 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The approximationError.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Attribution.java