# SciPy 1.5.2 Release Notes

SciPy 1.5.2 is a bug-fix release with no new features compared to 1.5.1.

## Authors

- Peter Bell

- Tobias Biester +

- Evgeni Burovski

- Thomas A Caswell

- Ralf Gommers

- Sturla Molden

- Andrew Nelson

- ofirr +

- Sambit Panda

- Ilhan Polat

- Tyler Reddy

- Atsushi Sakai

- Pauli Virtanen

A total of 13 people contributed to this release. People with a “+” by their names contributed a patch for the first time. This list of names is automatically generated, and may not be fully complete.

### Issues closed for 1.5.2

- #3847: Crash of interpolate.splprep(task=-1)

- #7395: splprep segfaults if fixed knots are specified

- #10761: scipy.signal.convolve2d produces incorrect values for large arrays

- #11971: DOC: search in devdocs returns wrong link

- #12155: BUG: Fix permutation of distance matrices in scipy.stats.multiscale_graphcorr

- #12203: Unable to install on PyPy 7.3.1 (Python 3.6.9)

- #12316: negative scipy.spatial.distance.correlation

- #12422: BUG: slsqp: ValueError: failed to initialize intent(inout) array…

- #12428: stats.truncnorm.rvs() never returns a scalar in 1.5

- #12441: eigvalsh inconsistent eigvals= subset_by_index=

- #12445: DOC: scipy.linalg.eigh

- #12449: Warnings are not filtered in csr_matrix.sum()

- #12469: SciPy 1.9 exception in LSQSphereBivariateSpline

- #12487: BUG: optimize: incorrect result from approx_fprime

- #12493: CI: GitHub Actions for maintenance branches

- #12533: eigh gives incorrect results

- #12579: BLD, MAINT: distutils issues in wheels repo

### Pull requests for 1.5.2

- #12156: BUG: Fix permutation of distance matrices in scipy.stats.multiscale_graphcorr

- #12238: BUG: Use 64-bit indexing in convolve2d to avoid overflow

- #12256: BLD: Build lsap as a single extension instead of extension +…

- #12320: BUG: spatial: avoid returning negative correlation distance

- #12383: ENH: Make cKDTree.tree more efficient

- #12392: DOC: update scipy-sphinx-theme

- #12430: BUG: truncnorm and geninvgauss never return scalars from rvs

- #12437: BUG: optimize: cast bounds to floats in new_bounds_to_old/old_bounds_to_new

- #12442: MAINT:linalg: Fix for input args of eigvalsh

- #12461: MAINT: sparse: write matrix/asmatrix wrappers without warning…

- #12478: BUG: fix array_like input defects and add tests for all functions…

- #12488: BUG: fix approx_derivative step size. Closes #12487

- #12500: CI: actions branch trigger fix

- #12501: CI: actions branch trigger fix

- #12504: BUG: cKDTreeNode use after free

- #12529: MAINT: allow graceful docs re-upload

- #12538: BUG:linalg: eigh type parameter handling corrected

- #12560: MAINT: truncnorm.rvs compatibility for `Generator`

- #12562: redo gh-12188: fix segfaults in splprep with fixed knots

- #12586: BLD: Add -std=c99 to sigtools to compile with C99

- #12590: CI: Add GCC 4.8 entry to travis build matrix

- #12591: BLD: fix cython error on master-branch cython