[BUG] : No module named 'pygmtools.c_astar'

[chowkamlee81]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Code to reproduce the behavior:

python plot_deep_image_matching_pytorch.ipynb

Expected behavior
Successfully run image matching algorithm

Screenshots
If applicable, add screenshots to help explain your problem.

Environment:

• OS: Ubuntu 20.04.4 LTS
• Pygmtools Version 0.4.2
• Environment report, by running the command python3 -c 'import pygmtools; pygmtools.env_report()'
• ``
• NumPy 1.24.4
  SciPy 1.10.1
  pygmtools 0.4.2
  Torch 1.12.1+cu113
  Paddle not installed
  Jittor not installed``

Additional context
Add any other context about the problem here.

@rogerwwww kindly help

[heatingma]

Hello! I'm glad to answer your question.

We ran the file "plot_deep_image_matching_pytorch.py" in the environment you provided and didn't encounter any bug.

The bug you're experiencing is because the dynamic link library for c_astar cannot be found. Could you check if you can find a file similar to c_astar.cpython-38-x86_64-linux-gnu.so in the directory /data/pygm_env/lib/python3.8/site-packages/pygmtools/?

If you cannot find the file, you can try reinstalling pygmtools. Additionally, we provide the source code for astar, which is located in the c_astar subfolder of pygmtools. You can navigate to that subfolder and use the following command to generate the .so file.

python c_astar_setup.py build_ext --inplace

If you're still unable to resolve the issue, please let us know, and we'll be happy to continue assisting you.

[chowkamlee81]

@heatingma
iam getting now error below
ImportError: cannot import name 'c_astar' from 'pygmtools.c_astar' (unknown location)

ImportError Traceback (most recent call last)
Cell In[13], line 3
1 n1 = params[0]
2 n2 = params[1]
----> 3 X = pygm.sm(K, n1, n2)

File /data/pygmtools/pygmtools/classic_solvers.py:370, in sm(K, n1, n2, n1max, n2max, x0, max_iter, backend)
368 if backend is None:
369 backend = pygmtools.BACKEND
--> 370 _check_data_type(K, 'K', backend)
371 if _check_shape(K, 2, backend):
372 K = _unsqueeze(K, 0, backend)

File /data/pygmtools/pygmtools/utils.py:1125, in _check_data_type(input, *args)
1123 args = (input, var_name, raise_err)
1124 try:
-> 1125 mod = importlib.import_module(f'pygmtools.{backend}_backend')
1126 fn = mod._check_data_type
1127 except (ModuleNotFoundError, AttributeError):

File /usr/lib/python3.8/importlib/init.py:127, in import_module(name, package)
125 break
126 level += 1
--> 127 return _bootstrap._gcd_import(name[level:], package, level)

File :1014, in _gcd_import(name, package, level)

File :991, in find_and_load(name, import)

File :975, in find_and_load_unlocked(name, import)

File :671, in _load_unlocked(spec)

File :848, in exec_module(self, module)

File :219, in _call_with_frames_removed(f, *args, **kwds)

File /data/pygmtools/pygmtools/pytorch_backend.py:23
20 from .pytorch_astar_modules import GCNConv, AttentionModule, TensorNetworkModule, GraphPair,
21 VERY_LARGE_INT, to_dense_adj, to_dense_batch, default_parameter, check_layer_parameter, node_metric
22 from torch import Tensor
---> 23 from pygmtools.c_astar import c_astar
25 #############################################
26 # Linear Assignment Problem Solvers #
27 #############################################
29 from pygmtools.numpy_backend import _hung_kernel

ImportError: cannot import name 'c_astar' from 'pygmtools.c_astar' (unknown location)

[chowkamlee81]

@heatingma after using your suggested command python c_astar_setup.py build_ext --inplace i reinstalled pygmtools again using python -m pip install -e .. Iam able to solve the issue. Hence closing now