Issues

• Where cuML spends its CuPy time, and ten ways to cut it

  cupy/cupy#10428 · Filter by author maxwbuckley opened on Oct 24, 2026

• Host<->device transfer costs: host-side transpose for order mismatch, single-threaded un-overlapped staging copy, pageable get()

  cupy/cupy#10417 · Filter by author maxwbuckley opened on Oct 22, 2026
  1

• Complex LOBPCG whitening uses transpose instead of conjugate transpose

  cupy/cupy#10405 · Filter by author alecjacobson opened on Oct 20, 2026

• LOBPCG passes None to A after residual-block orthogonalization fails

  cupy/cupy#10404 · Filter by author alecjacobson opened on Oct 20, 2026
  1

• LOBPCG Fiedler test compares invariant high modes while requesting largest=False

  cupy/cupy#10403 · Filter by author alecjacobson opened on Oct 19, 2026

• LOBPCG can stop early with returned residual above tol after soft locking

  cupy/cupy#10402 · Filter by author alecjacobson opened on Oct 19, 2026
  3

• Explicitly constructed sparse arrays and contiguity

  cat:bugprio:medium
  cupy/cupy#10381 · Filter by author seberg opened on Oct 9, 2026 · v15.0.0
  3

• CI: revert the win.cuda124 cuda-cccl carve-out once cccl#11885 is fixed

  cat:testst:blocked-by-another-pr
  cupy/cupy#10370 · Filter by author leofang opened on Oct 7, 2026 · v15.0.0
  1

• Make -head job pick up nightly runs

  cat:test
  cupy/cupy#10369 · Filter by author seberg opened on Oct 7, 2026
  

• Path to improved fusion (possibly replacing the old one)

  cat:enhancementprio:high
  cupy/cupy#10367 · Filter by author seberg opened on Oct 6, 2026 · v15.0.0
  

• eigsh(sigma=...): default tol=0 makes cost start-vector dependent (up to 3.5x) and is never more accurate than an explicit tol

  cat:performancest:needs-discussion
  cupy/cupy#10354 · Filter by author smarkesini opened on Oct 5, 2026
  3

• Pickle round trip of a compiled ufunc unloads the original's kernel module (CUDA_ERROR_INVALID_HANDLE)

  cat:bugcat:enhancementprio:lowst:needs-discussion
  cupy/cupy#10334 · Filter by author pzeiger opened on Sep 30, 2026
  2

• CI: make scheduled cuda-head/cuda-slow pipelines green or retire them

  cat:test
  cupy/cupy#10326 · Filter by author leofang opened on Sep 27, 2026
  5

  

• [RFC] Block thick-restart Lanczos for eigsh/svds: structural fix for degenerate spectra + integer-factor GPU speedups

  cupy/cupy#10324 · Filter by author smarkesini opened on Sep 26, 2026
  2

• CuPy Windows wheels depend on MSVC Redistributable

  cat:bugcat:installprio:medium
  cupy/cupy#10316 · Filter by author leofang opened on Sep 18, 2026 · v14.3.0

• MNT: Consolidate NumPy/SciPy baseline source location

  cat:bugprio:medium
  cupy/cupy#10312 · Filter by author leofang opened on Sep 16, 2026
  2

• Deprecate explicit fft Plan instantiation

  cat:otherprio:medium
  cupy/cupy#10305 · Filter by author seberg opened on Sep 14, 2026 · v14.3.0
  

• make_interp_spline does not return a periodic spline for k=0 and k=1 when bc_type="periodic"

  cat:bugcontribution welcomeprio:medium
  cupy/cupy#10304 · Filter by author faymanns opened on Sep 14, 2026
  1

• Support cuTENSOR 2.8.1

  cat:enhancementprio:medium
  cupy/cupy#10301 · Filter by author leofang opened on Sep 11, 2026
  1

• Very niche out= bug in CUB fast-path

  cat:bugprio:medium
  cupy/cupy#10300 · Filter by author seberg opened on Sep 11, 2026
  2

• Drop cuTENSORMg bindings

  prio:highst:needs-discussion
  cupy/cupy#10299 · Filter by author leofang opened on Sep 11, 2026
  1

• Smaller issues found while getting SciPy 1.18 to work

  cat:bugprio:low
  cupy/cupy#10297 · Filter by author seberg opened on Sep 10, 2026 · v15.0.0

• Bump baseline to SciPy 1.18

  cat:installno-compatprio:medium
  cupy/cupy#10293 · Filter by author seberg opened on Sep 9, 2026 · v15.0.0
  2

  

• cupyx.scipy.signal.oaconvolve: 'same' mode truncates broadcast batch dimensions to the first input's size

  cupy/cupy#10292 · Filter by author IMGillusion opened on Sep 8, 2026
  1

• Do an agent-assisted audit of huge array support

  cat:enhancementprio:high
  cupy/cupy#10290 · Filter by author seberg opened on Sep 8, 2026 · v14.3.0
  4