Issues

• The protoc code generator tooling still uses lib2to3 which is no longer shipped

  bug
  apple/coremltools#2880 · Filter by author nullr0ute opened on Sep 30, 2026

• _python_version in coremltools/models/utils.py doesn't handle RCs and other possible versions

  bug
  apple/coremltools#2874 · Filter by author nullr0ute opened on Sep 25, 2026

• FP8 support?

  question
  apple/coremltools#2860 · Filter by author y-ich opened on Sep 14, 2026
  1

• linear_quantize_weights: divide-by-zero and NaN-to-int cast when a weight block is all zeros

  apple/coremltools#2853 · Filter by author TusharND12 opened on Sep 9, 2026

• PyPI sdist missing C++ source — cannot build native libraries from source

  bug
  apple/coremltools#2847 · Filter by author mikedep333 opened on Sep 4, 2026
  4

• TorchConverter: states=[] cannot express "this model has no states"

  apple/coremltools#2826 · Filter by author john-rocky opened on Aug 20, 2026
  2

• SIGSEGV in Espresso cast_kernel_cpu / vDSP_vflt32 for transformer text encoders with a dynamic sequence dimension (static shape works)

  apple/coremltools#2825 · Filter by author msluszniak opened on Aug 19, 2026
  2

• Removed torch.ao.quantization.quantizer imports in coremltools/optimize/torch break on torch 2.11 — request for decision on removal/deprecation of CoreMLQuantizer

  apple/coremltools#2823 · Filter by author xyf5432 opened on Aug 19, 2026
  4

• rms_norm translation inflates eps by max(|x|)^2 — percent-level errors on spiky activations even at FLOAT32 / CPU_ONLY

  apple/coremltools#2821 · Filter by author nschlaepfer opened on Aug 19, 2026

• EnumeratedShapes converts with ClassifierConfig

  bug
  apple/coremltools#2764 · Filter by author DLumi opened on Jul 29, 2026
  4

• MLComputePlan.load_from_path() aborts the whole process (uncatchable SIGABRT) when given an .mlpackage path

  apple/coremltools#2757 · Filter by author robertopernisco opened on Jul 14, 2026
  6

• Map MIL ops back to their originating nn.Module for debugging and profiling

  feature request
  apple/coremltools#2751 · Filter by author RKey-PairApple opened on Jun 30, 2026
  3

• TensorFlow frontend Softplus converter still emits native softplus op (fp16 overflow risk on ANE)

  apple/coremltools#2747 · Filter by author Ashutosh0x opened on Jun 21, 2026

• [PyTorch] Support divisor_override for avg_pool2d and avg_pool3d

  feature request
  apple/coremltools#2745 · Filter by author ash010413 opened on Jun 20, 2026

• # Bug Report: EnumeratedShapes / FlexibleShapeInfo models fail at inference, no workaround found

  bug
  apple/coremltools#2730 · Filter by author Suad0 opened on Jun 1, 2026
  1

• logcumsumexp overflows on Apple Neural Engine in fp16 for inputs > ~11.09 (output collapses to inf then NaN)

  apple/coremltools#2729 · Filter by author Ashutosh0x opened on May 29, 2026

• log_softmax produces -inf on Apple Neural Engine in fp16 when one class dominates

  apple/coremltools#2728 · Filter by author Ashutosh0x opened on May 29, 2026

• [ANE] palettize_weights(nbits=4) stateful mlpackage built with cm 9.0 crashes after ~100-200 sequential predicts; cm 8.3.0 build of same source does not

  apple/coremltools#2716 · Filter by author marian-gg opened on May 24, 2026
  1

• Channel-reduce logsumexp on Apple Neural Engine has a hard fp16 overflow at x ≈ 7.63 (output drops to 0)

  bug
  apple/coremltools#2690 · Filter by author ChinChangYang opened on May 5, 2026
  2

• Softplus on Apple Neural Engine has a hard fp16 discontinuity at x ≈ 10.4 (output drops to 0)

  bug
  apple/coremltools#2687 · Filter by author ChinChangYang opened on May 3, 2026
  4

• InstanceNorm3d crashes on CoreML GPU path but works on CPU path

  bug
  apple/coremltools#2667 · Filter by author 0xShug0 opened on Apr 2, 2026
  1

• Support Python 3.14

  feature request
  apple/coremltools#2646 · Filter by author cdeil opened on Jan 26, 2026
  5

• Large output errors when converting MobileNetV3 in FP16

  bug
  apple/coremltools#2625 · Filter by author johan-sightic opened on Nov 21, 2025
  18

• CoreML Conversion hangs with minimal pipeline when 16-bit cast pass is specified

  bugPyTorch (traced)triaged
  apple/coremltools#2621 · Filter by author jgibson2 opened on Nov 11, 2025
  9

• Difference between CoreML and Pytorch inference

  question
  apple/coremltools#2620 · Filter by author onurtore opened on Nov 9, 2025
  2