class_docstr: Container for correlation calculation and visualization.
  
  This class (object) is returned from the ``correlation_matrix`` function. The
  attributes documented below can be accessed or extracted.
  
  Attributes:
      association_matrix: The combined association matrix i.e. correlation and other
          categorical-numeric or categorical-categorical associations.
      cluster_matrix: The clustered association matrix.
      categorical (bool): True if association matrix contains categorical values.
      viz_data: The final data to be visualized.
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docstr: The default display for this output.
  
  Displays the correlation matrix heatmap.
  
  Args:
      viz_backend: The visualization backend.
      **kwargs: Keyword arguments.
  
  Raises:
      ValueError: Computed data is missing.
  
  Returns:
      The correlation matrix plot.
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code: def show(self, viz_backend=None, **kwargs):
      """The default display for this output.
  
      Displays the correlation matrix heatmap.
  
      Args:
          viz_backend: The visualization backend.
          **kwargs: Keyword arguments.
  
      Raises:
          ValueError: Computed data is missing.
  
      Returns:
          The correlation matrix plot.
      """
      backend = viz_backend or self.viz_backend
  
      if self.viz_data is None:
          raise ValueError("Could not find data to visualize.")
  
      return _get_viz_backend(backend).viz_correlation_matrix(
          self.viz_data, **kwargs
      )
  
imports: import warnings
  import pandas
  import numpy
  from scipy.cluster import hierarchy
  from sklearn.metrics import matthews_corrcoef
  from scipy.stats import chi2_contingency
  import seaborn
  import matplotlib.pyplot
  import plotly.graph_objs
  import plotly.offline
  from data_describe.config._config import get_option
  from data_describe.misc.colors import get_p_RdBl_cmap, mpl_to_plotly_cmap
  from data_describe._widget import BaseWidget
  from data_describe.compat import _is_dataframe, _in_notebook, _requires
  from data_describe.backends import _get_viz_backend, _get_compute_backend
label_desc: Use image node_id 3 for calling the CorrelationWidget obj's underlying member method code with example usage: obj.show(viz_backend) and returns: _get_viz_backend