mask=np.triu(np.ones_like(corr,dtype=bool))
f ,ax = plt.subplots(figsize=(11,9))
cmap=sns.diverging_palette(230,20, as_cmap=True)
sns.heatmap(corr, mask=mask, cmap=cmap, vmax=.3, center=0,
square=True, linewidth=.5, cbar_kws={'shrink':.5})
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