prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Unused import of math in time_sequence_prediction example
  The generate_sine_wave.py module imports math on the first line, but doesn't use it. This import should be removed.
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `time_sequence_prediction/generate_sine_wave.py`
  Content:
  ```
  1 import math
  2 import numpy as np
  3 import torch
  4 T = 20
  5 L = 1000
  6 N = 100
  7 np.random.seed(2)
  8 x = np.empty((N, L), 'int64')
  9 x[:] = np.array(range(L)) + np.random.randint(-4*T, 4*T, N).reshape(N, 1)
  10 data = np.sin(x / 1.0 / T).astype('float64')
  11 torch.save(data, open('traindata.pt', 'wb'))
  12 
  13
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/time_sequence_prediction/generate_sine_wave.py b/time_sequence_prediction/generate_sine_wave.py
  --- a/time_sequence_prediction/generate_sine_wave.py
  +++ b/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'))
  -
  
verification_info: {"golden_diff": "diff --git a/time_sequence_prediction/generate_sine_wave.py b/time_sequence_prediction/generate_sine_wave.py\n--- a/time_sequence_prediction/generate_sine_wave.py\n+++ b/time_sequence_prediction/generate_sine_wave.py\n@@ -1,12 +1,13 @@\n-import math\n import numpy as np\n import torch\n+\n+np.random.seed(2)\n+\n T = 20\n L = 1000\n N = 100\n-np.random.seed(2)\n+\n x = np.empty((N, L), 'int64')\n-x[:] = np.array(range(L)) + np.random.randint(-4*T, 4*T, N).reshape(N, 1)\n+x[:] = np.array(range(L)) + np.random.randint(-4 * T, 4 * T, N).reshape(N, 1)\n data = np.sin(x / 1.0 / T).astype('float64')\n torch.save(data, open('traindata.pt', 'wb'))\n-\n", "issue": "Unused import of math in time_sequence_prediction example\nThe generate_sine_wave.py module imports math on the first line, but doesn't use it. This import should be removed.\n", "before_files": [{"content": "import math\nimport numpy as np\nimport torch\nT = 20\nL = 1000\nN = 100\nnp.random.seed(2)\nx = np.empty((N, L), 'int64')\nx[:] = np.array(range(L)) + np.random.randint(-4*T, 4*T, N).reshape(N, 1)\ndata = np.sin(x / 1.0 / T).astype('float64')\ntorch.save(data, open('traindata.pt', 'wb'))\n\n", "path": "time_sequence_prediction/generate_sine_wave.py"}], "after_files": [{"content": "import numpy as np\nimport torch\n\nnp.random.seed(2)\n\nT = 20\nL = 1000\nN = 100\n\nx = np.empty((N, L), 'int64')\nx[:] = np.array(range(L)) + np.random.randint(-4 * T, 4 * T, N).reshape(N, 1)\ndata = np.sin(x / 1.0 / T).astype('float64')\ntorch.save(data, open('traindata.pt', 'wb'))\n", "path": "time_sequence_prediction/generate_sine_wave.py"}]}