there are two types of the BPNN algorithm: vector based and matrix based.

each BPNN algorithm is then divided into two processes: training and testing

this is created in google colab for ease of access to database

the training and testing images are all in grayscale and in 40x40 pixel size

database google drive:

training database: https://drive.google.com/drive/folders/1wUvHH_tnof17uG6kgJsrQ6Tj1cX-7dH5?usp=sharing

testing database: https://drive.google.com/drive/folders/1EZlD2umWjITjrzoX-AhtNjYoXy2VOyeL?usp=drive_link