请写出下方代码的功能<br>pearson = pd.Series(name="pearson correlation")<br>for i in train_x:<br> pearson[i] = pearsonr(train_y, train_x[i])[0] <br>var_cor = pearson.abs() > 0.5

请写出下方代码的功能
pearson = pd.Series(name="pearson correlation")
for i in train_x:
pearson[i] = pearsonr(train_y, train_x[i])[0]
var_cor = pearson.abs() > 0.5

出自：国家开放大学大数据预处理复习题

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