Python ImportError:无法导入名称dtw

Question

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我通过以下方式安装了python DTW (动态时间扭曲)模块

python -m pip install dtw

当我尝试使用from dtw import dtw (我正在使用http://nbviewer.jupyter.org/github/pierre-rouanet/dtw/blob/master/simple%20example.ipynb)导入模块时，我得到了一个ImportError: cannot import name dtw。我检查了C:\Python27\Lib\site-packages中是否存在dtw.py和dtw.pyc文件。有谁知道这个问题的解决方案吗？

Answer 1

如果您正在寻找速度

from cdtw import pydtw
from dtaidistance import dtw
from fastdtw import fastdtw
from scipy.spatial.distance import euclidean
s1=np.array([1,2,3,4],dtype=np.double)
s2=np.array([4,3,2,1],dtype=np.double)

%timeit dtw.distance_fast(s1, s2)
4.1 µs ± 28.6 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
%timeit d2 = pydtw.dtw(s1,s2,pydtw.Settings(step = 'p0sym', window = 'palival', param = 2.0, norm = False, compute_path = True)).get_dist()
45.6 µs ± 3.39 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
%timeit d3,_=fastdtw(s1, s2, dist=euclidean)
901 µs ± 9.95 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

fastdtw比dtaidistance lib慢219倍，比cdtw慢20倍

考虑改变。下面是dtaidistance git：

https://github.com/wannesm/dtaidistance

要安装，只需：

pip install dtaidistance