can u explain this pls

: array_2d = np . array ( [ [1, 2, 3], [5, 6, 7]]) print (" a=", array_2d) #reshape matrix b = array_2d . reshape (1, 6) print (" \ b =", b) c = array_2d . reshape (6, 1) print("\ c =", c) d = array_2d . reshape(3, 2) print ("\ d =", d)