Can not import pysindy after installation

[xinchen236]

I installed pysindy from a local copy, and it shows a successful installation. But when I tried to import the package on Python, an error came out as "NameError: name 'cp' is not defined". The details are attached below. Can anyone help me with this issue? Many thanks!

NameError Traceback (most recent call last)
Cell In[5], line 1
----> 1 import pysindy as ps
cost = cp.sum_squares(x_expanded @ xi - y.flatten())

NameError: name 'cp' is not defined

[xinchen236]

Problem solved. Need to install "cvxpy" first.

[Jacob-Stevens-Haas]

No, this is an issue. cvxpy is an optional dependency, and it shouldn't block importing pysindy. (It should block using ConstrainedSR3, however).

the file likely needs a from __future__ import annotations line at the top.

What's your pysindy version?

[talitta-nunes]

I had a similar problem, but it's causing the error below. I like to test using Google Colab, I never had any trouble until today! I tried to remove the derivative package, install the correct version of the importlib_metadata and run again, but unsuccessful. So I had to use the virtual environment to deal with and make it work

ContextualVersionConflict                 Traceback (most recent call last)
<ipython-input-24-a39643098e1c> in <cell line: 1>()
----> 1 import pysindy as ps
      2 import numpy as np
      3 import pandas as pd
      4 import math
      5 import matplotlib.pyplot as plt

5 frames
/usr/local/lib/python3.10/dist-packages/pkg_resources/__init__.py in _resolve_dist(self, req, best, replace_conflicting, env, installer, required_by, to_activate)
    871             # Oops, the "best" so far conflicts with a dependency
    872             dependent_req = required_by[req]
--> 873             raise VersionConflict(dist, req).with_context(dependent_req)
    874         return dist
    875 

ContextualVersionConflict: (importlib-metadata 8.0.0 (/usr/local/lib/python3.10/dist-packages), Requirement.parse('importlib-metadata<8.0.0,>=7.1.0'), {'derivative'})```

[Jacob-Stevens-Haas]

Hi Talitta, I'm not sure what you were trying to to accomplish that prompted this error, but using a virtual environment is normal practice to prevent version conflicts. I'm not familiar with google's installation package management system, however.

It appears you have a conflict because pysindy requires derivative, and derivative requires importlib-metadata <8.0.0, but something else requires importlib-metadata >= 8.0.0.

[Jacob-Stevens-Haas]

For those with the importlib-metadata conflict, that's being generated by derivative - a dependency of pysindy, but it's own package. I would suggest positing the issue there.

[lunassneu]

The same thing happened to me. I installed Sindy directly from the git repository, I use Windows, Anaconda.
the installation was successful, but when I import sindy this error message appears about cp:

NameError Traceback (most recent call last)
Cell In[3], line 1
----> 1 import pysindy as ps

File D:\Program Files\anaconda3\Lib\site-packages\pysindy_init_.py:11
9 from . import differentiation
10 from . import feature_library
---> 11 from . import optimizers
12 from . import deeptime
13 from . import utils

File D:\Program Files\anaconda3\Lib\site-packages\pysindy\optimizers_init_.py:3
1 from .base import BaseOptimizer
2 from .base import EnsembleOptimizer
----> 3 from .constrained_sr3 import ConstrainedSR3
4 from .frols import FROLS
6 try: # Waiting on PEP 690 to lazy import gurobipy

File D:\Program Files\anaconda3\Lib\site-packages\pysindy\optimizers\constrained_sr3.py:22
18 from ..utils import reorder_constraints
19 from .sr3 import SR3
---> 22 class ConstrainedSR3(SR3):
23 """
24 Sparse relaxed regularized regression with linear (in)equality constraints.
25
(...)
152 may increase and decrease as the algorithm works.
153 """
155 def init(
156 self,
157 threshold=0.1,
(...)
176 unbias=False,
177 ):

File D:\Program Files\anaconda3\Lib\site-packages\pysindy\optimizers\constrained_sr3.py:276, in ConstrainedSR3()
271 rhs = rhs.reshape(g.shape)
272 return inv1.dot(rhs)
274 def _create_var_and_part_cost(
275 self, var_len: int, x_expanded: np.ndarray, y: np.ndarray
--> 276 ) -> Tuple[cp.Variable, cp.Expression]:
277 xi = cp.Variable(var_len)
278 cost = cp.sum_squares(x_expanded @ xi - y.flatten())

NameError: name 'cp' is not defined

I didn't understand what Jacob said about from future import annotations
Where do I have to add this line of code?

[lunassneu]

No, this is an issue. cvxpy is an optional dependency, and it shouldn't block importing pysindy. (It should block using ConstrainedSR3, however).

the file likely needs a from __future__ import annotations line at the top.

What's your pysindy version?

Can you help me please? I explained the problem above