import numpy as np

def check_mse(n_eval, batch_size):

    y, MSE = np.zeros(n_eval), np.zeros(n_eval)
    for k in range(max(1, n_eval / batch_size)):
        batch_from = k * batch_size
        batch_to = min([(k + 1) * batch_size + 1, n_eval + 1])

        print batch_from, batch_to

def check_mse_fixed(n_eval, batch_size):

    y, MSE = np.zeros(n_eval), np.zeros(n_eval)
    for k in range(int(np.ceil(n_eval / float(batch_size)))):
        batch_from = k * batch_size
        batch_to = min([(k + 1) * batch_size + 1, n_eval + 1])

        print batch_from, batch_to


check_mse(8, 3)
print
check_mse_fixed(8, 3)

0 4
3 7

0 4
3 7
6 9