利用python实现并行计算下的DTW算法
时间: 2023-05-21 09:06:46 浏览: 197
DTW算法计算实例
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可以使用Python的多线程或多进程库来实现并行计算下的DTW算法。其中,使用多线程的代码示例如下:
```python
import numpy as np
import threading
import queue
def dtw_distance_parallel(x, y, num_threads):
"""
Compute the DTW distance between two signals using parallel computing.
:param x: first signal
:param y: second signal
:param num_threads: number of threads used for parallel computing
:return: DTW distance between x and y
"""
n, m = len(x), len(y)
D = np.full((n + 1, m + 1), np.inf)
D[0, 0] = 0
# Define worker function
def worker(q, i_start, i_end):
for i in range(i_start, i_end):
for j in range(max(1, i - m + n + 1), min(n + 1, i + 1)):
D_ij = np.linalg.norm(x[j - 1] - y[i - j]) ** 2
D[j, i - j + 1] = D_ij + min(D[j - 1, i - j + 1], D[j, i - j], D[j - 1, i - j])
# Put partial result into queue
q.put(D[i_end - 1, m])
# Create worker threads
q = queue.Queue()
threads = []
block_size = int(np.ceil(float(n) / num_threads))
for i_block in range(num_threads):
i_start = i_block * block_size
i_end = min(n, (i_block + 1) * block_size)
t = threading.Thread(target=worker, args=(q, i_start + 1, i_end + 1))
threads.append(t)
t.start()
# Collect results from worker threads
for t in threads:
t.join()
# Compute final result
return np.sqrt(q.get())
```
其中,DTW算法是一个用于信号处理和模式识别的动态规划算法,用于计算两个时间序列之间的距离。在这里,我们使用线程池和队列来实现多线程计算。具体来说,我们将DTW算法分成若干个块,每个块由一个工作线程计算。最终,我们将各个工作线程计算得出的DTW距离累加起来,得到最终结果。
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