Dear friends, this is a friend from Latin America reporting the error in one of his guides, the one on linear problems, which in the following paragraph represents a variable through (sns): train_dataset = X_train.copy() train_dataset.insert(0, "WAGE", y_train) _ = sns.pairplot(train_dataset, kind="reg", diag_kind="kde") which in representation to be defined as: _ the value is incorrect in addition to not importing the correct library.. I leave you what I did with colab and helping with this error corrected: !pip install seaborn import seaborn as sns # The code below will now execute successfully. train_dataset = X_train.copy() train_dataset.insert(0, "WAGE", y_train) a = sns.pairplot(train_dataset, kind="reg", diag_kind="kde") I appreciate your reading and correction in advance :) greetings. -- Carlos González T. Ing. Informático. [image: mobilePhone] +56977542105 [image: emailAddress] carlos.gonzalez1006@gmail.com [image: address] Maipú, Santiago