Results 1 issues of Shoichiro Fujiwara

Hi, I tried running [gradient_descent.py](https://github.com/aburkov/theMLbook/blob/master/gradient_descent.py). But it failed. ```bash $ python gradient_descent.py Traceback (most recent call last): File "gradient_descent.py", line 73, in x, y = np.loadtxt("data.txt", delimiter= "\t", unpack =...