code: def test_plot_corr(close_figures):
      hie_data = randhie.load_pandas()
      corr_matrix = np.corrcoef(hie_data.data.values.T)
  
      plot_corr(corr_matrix, xnames=hie_data.names)
  
      plot_corr(corr_matrix, xnames=[], ynames=hie_data.names)
  
      plot_corr(corr_matrix, normcolor=True, title="", cmap="jet")
  
imports: import numpy
  import pytest
  from statsmodels.datasets import randhie
  from statsmodels.graphics.correlation import plot_corr, plot_corr_grid
label_desc: Use image node_id 1 for calling a global function with example usage: test_plot_corr(close_figures) without return types