diff --git a/code/ch15/t10k-images-idx3-ubyte.gz b/code/ch15/t10k-images-idx3-ubyte.gz
deleted file mode 100644
index 5ace8ea9..00000000
Binary files a/code/ch15/t10k-images-idx3-ubyte.gz and /dev/null differ
diff --git a/code/ch15/t10k-labels-idx1-ubyte.gz b/code/ch15/t10k-labels-idx1-ubyte.gz
deleted file mode 100644
index a7e14154..00000000
Binary files a/code/ch15/t10k-labels-idx1-ubyte.gz and /dev/null differ
diff --git a/code/ch15/train-images-idx3-ubyte.gz b/code/ch15/train-images-idx3-ubyte.gz
deleted file mode 100644
index b50e4b6b..00000000
Binary files a/code/ch15/train-images-idx3-ubyte.gz and /dev/null differ
diff --git a/code/ch15/train-labels-idx1-ubyte.gz b/code/ch15/train-labels-idx1-ubyte.gz
deleted file mode 100644
index 707a576b..00000000
Binary files a/code/ch15/train-labels-idx1-ubyte.gz and /dev/null differ