Hi, Sorry if this question is redundant. I checked the "install" page in the SciPy docs, and couldn't find any mention of conda-forge. Can SciPy from pip (scipy-1.0.1-cp36-none-win_amd64.whl) be used with the numpy-feedstock from conda-forge? When I run the tests for scipy, the fail and hang after "scipy\linalg\tests\test_basic.py". The reason I thought this might work is because they both use a variant of OpenBLAS, but perhaps they are not compatible? I can see that NumPy openblas.dll is in miniconda/envs/<envname>/Library/bin (31,053KB) where as the SciPy openblas.dll is in site-packages/scipy/extra-dll (41,762KB) and the name is vendorized with a long alphanumeric string. Unfortunately if I try to use conda to install SciPy, conda uses the default "anaconda" channel, because win_amd64 conda-forge scipy-feedstock has been disabled, and when I run the tests using this mix of conda-forge:numpy and anaconda:scipy, I get the same failure at "scipy\linalg\tests\test_basic.py", which I would expect because the anaconda:scipy uses Intel-MKL not OpenBLAS, and I think these libraries need to be compatible for scipy to work, right? The test that fails is "TestDet.test_random()" scipy/linalg/tests/test_basic.py::TestDet::test_random FAILED [ 54%] this is the pytest traceback: --------------------------------------------------------------------------- AssertionError Traceback (most recent call last) <ipython-input-3-ff0509141d7f> in <module>() ----> 1 test_det.test_random() ~\AppData\Local\Continuum\miniconda3\envs\forge\lib\site-packages\scipy\linalg\tests\test_basic.py in test_random(self) 907 d1 = det(a) 908 d2 = basic_det(a) --> 909 assert_almost_equal(d1, d2) 910 911 def test_random_complex(self): ~\AppData\Local\Continuum\miniconda3\envs\forge\lib\site-packages\numpy\testing\nose_tools\utils.py in assert_almost_equal(actual, desired, decimal, err_msg, verbose) 579 pass 580 if abs(desired - actual) >= 1.5 * 10.0**(-decimal): --> 581 raise AssertionError(_build_err_msg()) 582 583 AssertionError: Arrays are not almost equal to 7 decimals ACTUAL: 0.001303440758814572 DESIRED: -0.09307217461347188 Then the next test hangs for several minute, and I have to kill the process. scipy/linalg/tests/test_basic.py::TestDet::test_random_complex It also hangs when I call it directly from an interpreter. If I use just pip to install both numpy (numpy-1.14.2-cp36-none-win_amd64.whl) and scipy ( scipy-1.0.1-cp36-none-win_amd64.whl) then all of the tests pass. And now I can see the vendorized version of openBLAS for numpy in site-packags/numpy/.libs (41762KB) matches the openBLAS in scipy/extra-dll, the vendor alpha-numeric string is also the same: " BNVRK7633HSX7YVO2TADGR4A5KEKXJAW" Maybe this is very basic, and I shouldn't be asking. But I don't understand how to use conda-forge then with SciPy and NumPy on Windows. It seems like users should only use all pip or only the default "anaconda" channel. Or if using conda-forge on window, then only use NumPy without SciPy, but that also means other packages like statsmodels are out too. Also maybe this is a question for conda-forge and not scipy-dev. Again, so sorry if my question is out of place. I'm also sorry if this is received poorly. I am so happy and very grateful for all of the volunteer work that has gone into making SciPy and NumPy work on Windows. I remember the old days when I had to refer people to cgohlke's website. If there is anything I can do to help, I can try. I will take a look at reactivating the conda-forge build for win_amd64, I believe that would solve the problem. Also I will bring up the issue of dependency clashes with conda-forge as well. Thanks, Mark -- Mark Mikofski, PhD (2005) *Fiat Lux*