AttributeError: module 'awkward' has no attribute 'layout'

[dr-stringfellow]

Hi, I am using the following python:
/cvmfs/sft.cern.ch/lcg/views/LCG_102b_cuda/x86_64-centos7-gcc8-opt/bin/python3

and added the following libraries:

pip3 install -t locallibs/ uproot awkward fastjet
cd locallibs/
export PYTHONPATH=${PWD}:${PYTHONPATH}
cd -

Versions:
python 3.9.12, GCC 8.3.0
awkward 2.0.0
uproot 5.0.0
fastjet 3.4.0.1

However, I get the following error when using fastjet:

Traceback (most recent call last):
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/cluster_results.py", line 203, in <module>
    dict_dataset[dset] = _dict_data(sets[dset],njets=9)
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/cluster_results.py", line 192, in _dict_data
    cluster = _cluster(jets)
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/cluster_results.py", line 181, in _cluster
    cluster = fastjet.ClusterSequence(array, jetdef)
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/locallibs/fastjet/__init__.py", line 215, in __init__
    fastjet._pyjet.AwkwardClusterSequence.__init__(
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/locallibs/fastjet/_pyjet.py", line 20, in __init__
    self._jagedness = self._check_jaggedness(data)
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/locallibs/fastjet/_pyjet.py", line 45, in _check_jaggedness
    if self._check_general_jaggedness(data) or self._check_listoffset(data):
  File "/work/submit/bmaier/abcnet/znunu_jets/test/OTPU/scripts/locallibs/fastjet/_pyjet.py", line 160, in _check_general_jaggedness
    ak.layout.IndexedArray64,
AttributeError: module 'awkward' has no attribute 'layout'

Do you have any idea how I could solve this?
Thank you!

[ianna]

Hi @dr-stringfellow. Thanks for reporting it. I think, you need a newer version of FastJet that has not been released yet. The error you observe comes from the fact that this version is using Awkward v1. I can see that this has already been fixed in the GitHub: https://github.com/scikit-hep/fastjet/blob/main/src/fastjet/_pyjet.py by @jpivarski in scikit-hep/fastjet#156

[ianna]

@dr-stringfellow - please, try the latest FastJet release https://github.com/scikit-hep/fastjet/releases/tag/v3.4.0.3 and let us know if there are any issues. Thanks!