Cvxpy: TypeError: __init__() got an unexpected keyword argument 'sign'

[wrossmorrow]

I get an error about cvxpy.Parameter objects being initialized with an unexpected keyword argument, "sign". This must be some kind of install error.

I've gotten this error with new installs in a couple places: in a new conda environment on MacOSX and on Linux machines otherwise following the conda install instructions exactly.

Traceback (most recent call last):
  File "idLogit.py", line 234, in <module>
    actual_run( L )
  File "idLogit.py", line 224, in actual_run
    betas , delta , loglk , success = trace_idLogit( I , A , N , inds , LR , y )
  File "idLogit.py", line 156, in trace_idLogit
    p , Lambda , prob , YX = make_idLogit( I , A , N , inds , LR , y )
  File "idLogit.py", line 126, in make_idLogit
    Lambda = cp.Parameter( sign="positive" )
  File "/Users/morrowwr/anaconda/envs/cvxpy/lib/python3.6/site-packages/cvxpy/expressions/constants/parameter.py", line 44, in __init__
    super(Parameter, self).__init__(shape, value, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'sign'

[SteveDiamond]

We only support CVXPY 1.0 and later now. For any older version of CVXPY, you'll need to solve your own problems. Sorry to be harsh but I don't want a Python 2 vs 3 situation!

[wrossmorrow]

Might want to ask some questions before closing. This is 1.0.1, according to conda list

GSB-C02TF2BAGTFL:runs morrowwr$ source activate cvxpy
(cvxpy) GSB-C02TF2BAGTFL:runs morrowwr$ conda list
# packages in environment at /Users/morrowwr/anaconda/envs/cvxpy:
#
# Name                    Version                   Build  Channel
blas                      1.0                    openblas  
ca-certificates           2018.03.07                    0  
certifi                   2018.4.16                py36_0  
cvxcanon                  0.1.1                    py36_0    cvxgrp
cvxpy                     1.0.1                    py36_0    cvxgrp
dill                      0.2.7.1          py36hdf89ffe_0  
ecos                      2.0.5            py36hf9b3073_0    cvxgrp
fastcache                 1.0.2            py36h1de35cc_2  
intel-openmp              2018.0.0                      8  
lapack                    3.6.1                         1    conda-forge
libcxx                    4.0.1                h579ed51_0  
libcxxabi                 4.0.1                hebd6815_0  
libedit                   3.1.20170329         hb402a30_2  
libffi                    3.2.1                h475c297_4  
libgcc                    4.8.5               hdbeacc1_10  
libgfortran               3.0.1                h93005f0_2  
libopenblas               0.2.20               hdc02c5d_7  
mkl                       2018.0.2                      1  
multiprocess              0.70.4                   py36_0    cvxgrp
ncurses                   6.1                  h0a44026_0  
numpy                     1.14.3           py36he6379a5_2  
numpy-base                1.14.3           py36h9797aa9_2  
openssl                   1.0.2o               h26aff7b_0  
pandas                    0.23.0           py36h1702cab_0  
pip                       10.0.1                   py36_0  
python                    3.6.5                hc167b69_1  
python-dateutil           2.7.3                    py36_0  
pytz                      2018.4                   py36_0  
readline                  7.0                  hc1231fa_4  
scipy                     1.1.0            py36hcaad992_0  
scs                       1.2.6                    py36_0    cvxgrp
setuptools                39.2.0                   py36_0  
six                       1.11.0           py36h0e22d5e_1  
sqlite                    3.23.1               hf1716c9_0  
tk                        8.6.7                h35a86e2_3  
toolz                     0.9.0                    py36_0  
wheel                     0.31.1                   py36_0  
xz                        5.2.4                h1de35cc_4  
zlib                      1.2.11               hf3cbc9b_2  
(cvxpy) GSB-C02TF2BAGTFL:runs morrowwr$ python
Python 3.6.5 |Anaconda, Inc.| (default, Apr 26 2018, 08:42:37) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cvxpy as cp
>>> cp.Parameter( sign="positive" )
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/morrowwr/anaconda/envs/cvxpy/lib/python3.6/site-packages/cvxpy/expressions/constants/parameter.py", line 44, in __init__
    super(Parameter, self).__init__(shape, value, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'sign'

[CordThomas]

I received the same error trying to follow along with the examples here.

gamma = Parameter(sign='positive')
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/anaconda3/lib/python3.6/site-packages/cvxpy/expressions/constants/parameter.py", line 44, in __init__
super(Parameter, self).__init__(shape, value, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'sign'

[SteveDiamond]

The Parameter(sign='positive') is CVXPY 0.4 syntax. In CVXPY 1.0 you write Parameter(nonneg=True), as discussed here: http://www.cvxpy.org/updates/index.html#attributes
I updated the examples you pointed to to use the new syntax.

[CordThomas]

Thank you.