class_docstr: Container for data heatmap calculation and visualization.
  
  This class (object) is returned from the ``data_heatmap`` function. The
  attributes documented below can be accessed or extracted.
  
  
  Attributes:
      input_data: The input data.
      colnames: Names of numeric columns.
      std_data: The transposed, standardized data after scaling.
      missing: If True, the heatmap shows missing values as indicators
          instead of standardized values.
      missing_data: The missing value indicator data.
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docstr: The default display for this output.
  
  Shows the data heatmap plot.
  
  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.
  
      Shows the data heatmap plot.
  
      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_data_heatmap(
          self.viz_data,
          colnames=self.colnames,
          missing=self.missing,
          **kwargs,
      )
  
imports: from typing import List
  import pandas
  import numpy
  from plotly.offline import init_notebook_mode, iplot
  from matplotlib.figure import Figure
  import seaborn
  import plotly.graph_objs
  from sklearn.preprocessing import StandardScaler
  from data_describe._widget import BaseWidget
  from data_describe.config._config import get_option
  from data_describe.compat import _is_dataframe, _requires, _in_notebook
  from data_describe.backends import _get_viz_backend, _get_compute_backend
label_desc: Use image node_id 4 for calling the HeatmapWidget obj's underlying member method code with example usage: obj.show(viz_backend) and returns: _get_viz_backend