python 笔记 ：trajectory_distance包（如何可以正确使用）【debug篇】

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包的地址：maikol-solis/trajectory_distance (github.com)

1 模块介绍

用Cython实现的Python模块，用于计算二维轨迹之间的距离

trajectory_distance包提供了9种轨迹间的距离计算方法：

1. SSPD（对称线段路径距离）
2. OWD（单向距离）
3. Hausdorff
4. Frechet
5. 离散Frechet
6. DTW（动态时间规整）
7. LCSS（最长公共子序列）
8. ERP（带实数惩罚的编辑距离）
9. EDR（实数序列上的编辑距离）

除了离散Frechet和离散Frechet，所有的距离计算都提供欧几里得或球形选项：

• 欧几里得是基于二维坐标之间的欧几里得距离。
• 球形是基于二维坐标之间的Haversine距离。

2 debug过程

2.1 python setup.py install > 1.txt 2>&1 之后的报错

部分内容如下：

Error compiling Cython file:
------------------------------------------------------------
...q=len(Q)cc=_compute_critical_values(P,Q,p,q)eps=cc[0]while(len(cc)!=1):m_i=len(cc)/2-1^
------------------------------------------------------------traj_dist/cydist/frechet.pyx:535:21: Cannot assign type 'double' to 'int'
Compiling traj_dist/cydist/frechet.pyx because it changed.
[1/1] Cythonizing traj_dist/cydist/frechet.pyx
Traceback (most recent call last):File "/home_nfs/liushuai/Dataspark/trajectory_distance/setup.py", line 20, in <module>setup(File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/__init__.py", line 107, in setupreturn distutils.core.setup(**attrs)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 185, in setupreturn run_commands(dist)^^^^^^^^^^^^^^^^^^File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 201, in run_commandsdist.run_commands()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 969, in run_commandsself.run_command(cmd)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/dist.py", line 1234, in run_commandsuper().run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_commandcmd_obj.run()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/command/install.py", line 80, in runself.do_egg_install()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/command/install.py", line 129, in do_egg_installself.run_command('bdist_egg')File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/cmd.py", line 318, in run_commandself.distribution.run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/dist.py", line 1234, in run_commandsuper().run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_commandcmd_obj.run()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/command/bdist_egg.py", line 164, in runcmd = self.call_command('install_lib', warn_dir=0)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/command/bdist_egg.py", line 150, in call_commandself.run_command(cmdname)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/cmd.py", line 318, in run_commandself.distribution.run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/dist.py", line 1234, in run_commandsuper().run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_commandcmd_obj.run()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/command/install_lib.py", line 11, in runself.build()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/command/install_lib.py", line 111, in buildself.run_command('build_ext')File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/cmd.py", line 318, in run_commandself.distribution.run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/dist.py", line 1234, in run_commandsuper().run_command(command)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_commandcmd_obj.run()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/command/build_ext.py", line 345, in runself.build_extensions()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/command/build_ext.py", line 467, in build_extensionsself._build_extensions_serial()File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/setuptools/_distutils/command/build_ext.py", line 493, in _build_extensions_serialself.build_extension(ext)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/Cython/Distutils/build_ext.py", line 122, in build_extensionnew_ext = cythonize(^^^^^^^^^^File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/Cython/Build/Dependencies.py", line 1134, in cythonizecythonize_one(*args)File "/home_nfs/liushuai/anaconda3/lib/python3.11/site-packages/Cython/Build/Dependencies.py", line 1301, in cythonize_oneraise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: traj_dist/cydist/frechet.pyx

• 在 traj_dist/cydist/frechet.pyx 文件中，有一处类型分配错误。错误信息提示不能将类型 'double' 分配给 'int'。这通常意味着在 Cython 代码中有一个类型不匹配的问题。
• 在这个具体的例子中，m_i=len(cc)/2-1 这行代码的问题是 len(cc)/2 的结果是一个浮点数（double），而 m_i 应该是一个整数（int）。
• 解决方法：通过使用整数除法 // 替代普通除法 / 来修复这个问题

然后就成功地install了

2.2 ModuleNotFoundError: No module named 'pydist'

 在python中敲入：

import traj_dist.distance as tdist

后，会出现如下错误： 

Traceback (most recent call last):File "<stdin>", line 1, in <module>File "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/distance.py", line 1, in <module>from pydist.linecell import trajectory_set_grid
ModuleNotFoundError: No module named 'pydist'

• 表明 Python 无法在环境中找到名为 pydist 的模块
• 但pydist 确实存在于 traj_dist 包的目录中
  • 这意味着问题可能不在于 pydist 模块的缺失，而是在于 Python 环境在寻找这个模块时出现了问题。
• 解决方法：
  • 在 traj_dist/distance.py 文件中，导入语句使用相对导入

#from pydist.linecell import trajectory_set_grid
from .pydist.linecell import trajectory_set_grid

•  
  • 或者使用绝对导入

from traj_dist.pydist.linecell import trajectory_set_grid

【类似语句一并修改】 

2.3  ModuleNotFoundError: No module named 'geohash'

pip install python-geohash

即可

2.4 ModuleNotFoundError: No module named 'basic_euclidean'

import traj_dist.distance as tdist

Traceback (most recent call last):File "<stdin>", line 1, in <module>File "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/distance.py", line 3, in <module>from .pydist.sspd import e_sspd, g_sspdFile "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/pydist/sspd.py", line 2, in <module>from basic_euclidean import point_to_trajectory
ModuleNotFoundError: No module named 'basic_euclidean'

和2.2类似，修改导入语句

#from basic_euclidean import point_to_trajectoryfrom .basic_euclidean import point_to_trajectory

或者 

from traj_dist.pydist.basic_euclidean import point_to_trajectory

【类似语句一并修改】

2.5 ModuleNotFoundError: No module named 'linecell'

import traj_dist.distance as tdist

Traceback (most recent call last):File "<stdin>", line 1, in <module>File "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/distance.py", line 11, in <module>from .pydist.sowd import sowd_gridFile "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/pydist/sowd.py", line 2, in <module>import linecell as linec
ModuleNotFoundError: No module named 'linecell'

还是修改导入内容

from . import linecell as linec
#或者
from traj_dist.pydist import linecell as linec

2.6 ModuleNotFoundError: No module named 'traj_dist.cydist.sspd'

import traj_dist.distance as tdist

Traceback (most recent call last):File "<stdin>", line 1, in <module>File "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/distance.py", line 13, in <module>from .cydist.sspd import c_e_sspd, c_g_sspd
ModuleNotFoundError: No module named 'traj_dist.cydist.sspd'

• 错误 ModuleNotFoundError: No module named 'traj_dist.cydist.sspd' 表示 Python 无法在 traj_dist.cydist 子模块中找到 sspd 模块
  • traj_dist/cydist 目录中包含 sspd.pyx 和 sspd.c 文件，说明 sspd 模块是一个 Cython 模块，它需要被编译成一个 Python 可以导入的扩展
  • 在有setup.py 文件的地方执行如下命令：
    • python setup.py build_ext --inplace
  • 这个命令会编译 .pyx 文件并生成

    Traceback (most recent call last):File "<stdin>", line 1, in <module>File "/home_nfs/liushuai/Dataspark/trajectory_distance/traj_dist/distance.py", line 13, in <module>from .cydist.sspd import c_e_sspd, c_g_sspdFile "traj_dist/cydist/sspd.pyx", line 8, in init traj_dist.cydist.sspdfrom basic_euclidean import c_point_to_trajectory
    ModuleNotFoundError: No module named 'basic_euclidean'

    相应的二进制扩展，如 .so 文件（在 Linux 或 macOS）或 .pyd 文件（在 Windows）
• 运行上述编译命令后，检查 traj_dist/cydist 目录，看看是否生成了 sspd 的扩展文件（.so 或 .pyd）。如果生成了，那么遍解决了这个错误，如果没有生成，可能是编译过程中出现了错误。

2.7 ModuleNotFoundError: No module named 'basic_euclidean'

import traj_dist.distance as tdist

• 在 sspd.pyx 中尝试从 basic_euclidean 导入时出现了问题
• 改成：

from .basic_euclidean import c_point_to_trajectory

但修改pyx文件和前面修改py文件不一样的是，在修改了 .pyx 文件之后，需要重新编译 Cython 扩展

python setup.py build_ext --inplace

然后就可以正常使用这个库了

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