Remove unused math import

Closes pytorch#204

Author: Kaixhin

time_sequence_prediction/generate_sine_wave.py

@@ -1,12 +1,13 @@
-import math
 import numpy as np
 import torch
+
+np.random.seed(2)
+
 T = 20
 L = 1000
 N = 100
-np.random.seed(2)
+
 x = np.empty((N, L), 'int64')
-x[:] = np.array(range(L)) + np.random.randint(-4*T, 4*T, N).reshape(N, 1)
+x[:] = np.array(range(L)) + np.random.randint(-4 * T, 4 * T, N).reshape(N, 1)
 data = np.sin(x / 1.0 / T).astype('float64')
 torch.save(data, open('traindata.pt', 'wb'))
-