def dtw_cpu()

in whisper/timing.py [0:0]

• 19 lines of code
• 7 McCabe index (conditional complexity)

def dtw_cpu(x: np.ndarray):
    N, M = x.shape
    cost = np.ones((N + 1, M + 1), dtype=np.float32) * np.inf
    trace = -np.ones((N + 1, M + 1), dtype=np.float32)

    cost[0, 0] = 0
    for j in range(1, M + 1):
        for i in range(1, N + 1):
            c0 = cost[i - 1, j - 1]
            c1 = cost[i - 1, j]
            c2 = cost[i, j - 1]

            if c0 < c1 and c0 < c2:
                c, t = c0, 0
            elif c1 < c0 and c1 < c2:
                c, t = c1, 1
            else:
                c, t = c2, 2

            cost[i, j] = x[i - 1, j - 1] + c
            trace[i, j] = t

    return backtrace(trace)