lesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the tablelesson 2 of 6 · array and series shapes - the table before the tablearray and series shapes - the table before the table
A training matrix X has shape (1000, 12). What does the 12 mean, and what's the first thing you check before feeding X to a model?