df_corr = df[df['advertiser_name'].isin(ad_list)].groupby('advertiser_name')[['clicks_ratio']].corr(df['view_unique_ratio'])
ax = sns.heatmap(df_corr, cmap='YlGn', annot=True, vmin=-0.4, vmax=0.4)
ax.set_yticklabels(list(df_corr.index),rotation=0)
ax.axes.get_xaxis().set_visible(False)
ax.set_ylabel("")
			ax.set_title("Corr. between click-ratio and impression-ratio", weight='bold', size=12)
fig = ax.get_figure()
fig.tight_layout()
fig.savefig("cor1.png",dpi=300)