2022-SC2598-000ZZ-2022-SCP8082660-N0: L03 - Ridge regression

L03 - Ridge regression

Did you remember to make the first column something unique in your call to get_records? Duplicate value '1' found in column 'activated'.

line 1291 of /lib/dml/mysqli_native_moodle_database.php: call to debugging()
line 1679 of /lib/dml/moodle_database.php: call to mysqli_native_moodle_database->get_records_sql()
line 1752 of /lib/dml/moodle_database.php: call to moodle_database->get_record_sql()
line 1733 of /lib/dml/moodle_database.php: call to moodle_database->get_field_sql()
line 1712 of /lib/dml/moodle_database.php: call to moodle_database->get_field_select()
line 231 of /plagiarism/compilatio/lib.php: call to moodle_database->get_field()
line 48 of /plagiarism/compilatio/classes/compilatio/documentFrame.php: call to compilatio_enabled()
line 93 of /plagiarism/compilatio/lib.php: call to CompilatioDocumentFrame::get_document_frame()
line 48 of /lib/plagiarismlib.php: call to plagiarism_plugin_compilatio->get_links()
line 561 of /mod/forum/classes/local/exporters/post.php: call to plagiarism_get_links()
line 423 of /mod/forum/classes/local/exporters/post.php: call to mod_forum\local\exporters\post->get_message()
line 125 of /lib/classes/external/exporter.php: call to mod_forum\local\exporters\post->get_other_values()
line 155 of /mod/forum/classes/local/exporters/posts.php: call to core\external\exporter->export()
line ? of unknownfile: call to mod_forum\local\exporters\posts->mod_forum\local\exporters\{closure}()
line 157 of /mod/forum/classes/local/exporters/posts.php: call to array_map()
line 125 of /lib/classes/external/exporter.php: call to mod_forum\local\exporters\posts->get_other_values()
line 189 of /mod/forum/classes/local/builders/exported_posts.php: call to core\external\exporter->export()
line 95 of /mod/forum/classes/local/renderers/posts.php: call to mod_forum\local\builders\exported_posts->build()
line 212 of /mod/forum/classes/local/renderers/discussion.php: call to mod_forum\local\renderers\posts->render()
line 343 of /mod/forum/discuss.php: call to mod_forum\local\renderers\discussion->render()

Error: mdb->get_record() found more than one record!

line 1691 of /lib/dml/moodle_database.php: call to debugging()
line 1651 of /lib/dml/moodle_database.php: call to moodle_database->get_record_sql()
line 1630 of /lib/dml/moodle_database.php: call to moodle_database->get_record_select()
line 160 of /plagiarism/compilatio/lib.php: call to moodle_database->get_record()
line 53 of /plagiarism/compilatio/classes/compilatio/documentFrame.php: call to compilatio_cm_use()
line 93 of /plagiarism/compilatio/lib.php: call to CompilatioDocumentFrame::get_document_frame()
line 48 of /lib/plagiarismlib.php: call to plagiarism_plugin_compilatio->get_links()
line 561 of /mod/forum/classes/local/exporters/post.php: call to plagiarism_get_links()
line 423 of /mod/forum/classes/local/exporters/post.php: call to mod_forum\local\exporters\post->get_message()
line 125 of /lib/classes/external/exporter.php: call to mod_forum\local\exporters\post->get_other_values()
line 155 of /mod/forum/classes/local/exporters/posts.php: call to core\external\exporter->export()
line ? of unknownfile: call to mod_forum\local\exporters\posts->mod_forum\local\exporters\{closure}()
line 157 of /mod/forum/classes/local/exporters/posts.php: call to array_map()
line 125 of /lib/classes/external/exporter.php: call to mod_forum\local\exporters\posts->get_other_values()
line 189 of /mod/forum/classes/local/builders/exported_posts.php: call to core\external\exporter->export()
line 95 of /mod/forum/classes/local/renderers/posts.php: call to mod_forum\local\builders\exported_posts->build()
line 212 of /mod/forum/classes/local/renderers/discussion.php: call to mod_forum\local\renderers\posts->render()
line 343 of /mod/forum/discuss.php: call to mod_forum\local\renderers\discussion->render()

In the formula of the Ridge regression, which is \( min_w ||y-X_w||^2_2 + \alpha*||w||^2_2 \), \( \alpha \) stands for the regularization term and it should avoid overfitting.

With small values for \( \alpha \) the ridge regression overfits the dataset with high accuracy both in training set and test set, while with higher values for \( \alpha \) the ridge regression ends up with an approximation function very far from the target.

Here there is my work
https://colab.research.google.com/drive/1342caJPl8NPH2PgAP7hyKKm2mOh7TTC-?usp=share_link

I use this dataset
https://stem.elearning.unipd.it/pluginfile.php/288962/mod_forum/post/4692/Melbourne_housing_FULL.csv