rapidsai / cudf

cuDF - GPU DataFrame Library
https://docs.rapids.ai/api/cudf/stable/
Apache License 2.0
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[BUG] map_partitions() potentially resulting in unexpected index #8196

Open shaneding opened 3 years ago

shaneding commented 3 years ago

Describe the bug When using map_partitions() on a dask_cudf dataframe we can potentially get an unexpected index. This does not affect .compute() by default as it reconstructs a global index.

Steps/Code to reproduce bug

import cudf
import dask_cudf
s = cudf.Series(["ab", "cd", "ef", "gh", "ij"])
ds = dask_cudf.from_cudf(s, 2)
print(ds.compute())
print(ds.map_partitions(lambda x: x.str.character_tokenize(), meta=ds._meta).compute())

This prints

0    ab
1    cd
2    ef
3    gh
4    ij
dtype: object
0    a
1    b
2    c
3    d
4    e
5    f
0    g
1    h
2    i
3    j
dtype: object

Expected behavior Would love to discuss what the expected output would be, but below is what I would expect.

0    ab
1    cd
2    ef
3    gh
4    ij
dtype: object
0    a
1    b
2    c
3    d
4    e
5    f
6    g
7    h
8    i
9    j
dtype: object

Environment details

Click here to see environment details

     **git***
     commit 512e485c41f0b9aa2261430ba426fa8c05c98c2a (HEAD -> list-accessor, origin/list-accessor)
     Merge: bf68778b78 5f9dade58a
     Author: Shane Ding 
     Date:   Fri May 7 14:33:32 2021 +0000

     Merge branch 'branch-0.20' of https://github.com/rapidsai/cudf into list-accessor
     **git submodules***

     ***OS Information***
     DGX_NAME="DGX Server"
     DGX_PRETTY_NAME="NVIDIA DGX Server"
     DGX_SWBUILD_DATE="2019-12-02"
     DGX_SWBUILD_VERSION="4.3.0"
     DGX_COMMIT_ID="3015363"
     DGX_PLATFORM="DGX Server for DGX-1"
     DGX_SERIAL_NUMBER="QTFCOU9270061"
     DISTRIB_ID=Ubuntu
     DISTRIB_RELEASE=18.04
     DISTRIB_CODENAME=bionic
     DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"
     NAME="Ubuntu"
     VERSION="18.04.3 LTS (Bionic Beaver)"
     ID=ubuntu
     ID_LIKE=debian
     PRETTY_NAME="Ubuntu 18.04.3 LTS"
     VERSION_ID="18.04"
     HOME_URL="https://www.ubuntu.com/"
     SUPPORT_URL="https://help.ubuntu.com/"
     BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
     PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
     VERSION_CODENAME=bionic
     UBUNTU_CODENAME=bionic
     Linux rl-dgx-r11-u30-rapids-dgx103 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

     ***GPU Information***
     Mon May 10 17:20:28 2021
     +-----------------------------------------------------------------------------+
     | NVIDIA-SMI 460.32.03    Driver Version: 460.32.03    CUDA Version: 11.2     |
     |-------------------------------+----------------------+----------------------+
     | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
     | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
     |                               |                      |               MIG M. |
     |===============================+======================+======================|
     |   0  Tesla V100-SXM2...  On   | 00000000:06:00.0 Off |                    0 |
     | N/A   35C    P0    48W / 163W |    718MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   1  Tesla V100-SXM2...  On   | 00000000:07:00.0 Off |                    0 |
     | N/A   33C    P0    42W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   2  Tesla V100-SXM2...  On   | 00000000:0A:00.0 Off |                    0 |
     | N/A   34C    P0    44W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   3  Tesla V100-SXM2...  On   | 00000000:0B:00.0 Off |                    0 |
     | N/A   31C    P0    43W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   4  Tesla V100-SXM2...  On   | 00000000:85:00.0 Off |                    0 |
     | N/A   36C    P0    43W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   5  Tesla V100-SXM2...  On   | 00000000:86:00.0 Off |                    0 |
     | N/A   35C    P0    43W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   6  Tesla V100-SXM2...  On   | 00000000:89:00.0 Off |                    0 |
     | N/A   37C    P0    41W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+
     |   7  Tesla V100-SXM2...  On   | 00000000:8A:00.0 Off |                    0 |
     | N/A   34C    P0    42W / 163W |      3MiB / 32510MiB |      0%      Default |
     |                               |                      |                  N/A |
     +-------------------------------+----------------------+----------------------+

     +-----------------------------------------------------------------------------+
     | Processes:                                                                  |
     |  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
     |        ID   ID                                                   Usage      |
     |=============================================================================|
     |    0   N/A  N/A     44033      C   .../envs/cudf_dev/bin/python      715MiB |
     +-----------------------------------------------------------------------------+

     ***CPU***
     Architecture:        x86_64
     CPU op-mode(s):      32-bit, 64-bit
     Byte Order:          Little Endian
     CPU(s):              80
     On-line CPU(s) list: 0-79
     Thread(s) per core:  2
     Core(s) per socket:  20
     Socket(s):           2
     NUMA node(s):        2
     Vendor ID:           GenuineIntel
     CPU family:          6
     Model:               79
     Model name:          Intel(R) Xeon(R) CPU E5-2698 v4 @ 2.20GHz
     Stepping:            1
     CPU MHz:             1967.306
     CPU max MHz:         3600.0000
     CPU min MHz:         1200.0000
     BogoMIPS:            4390.35
     Virtualization:      VT-x
     L1d cache:           32K
     L1i cache:           32K
     L2 cache:            256K
     L3 cache:            51200K
     NUMA node0 CPU(s):   0-19,40-59
     NUMA node1 CPU(s):   20-39,60-79
     Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm rdt_a rdseed adx smap intel_pt xsaveopt cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts md_clear flush_l1d

     ***CMake***
     /raid/sding/miniconda3/envs/cudf_dev/bin/cmake
     cmake version 3.18.5

     CMake suite maintained and supported by Kitware (kitware.com/cmake).

     ***g++***
     /usr/bin/g++
     g++ (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
     Copyright (C) 2017 Free Software Foundation, Inc.
     This is free software; see the source for copying conditions.  There is NO
     warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

     ***nvcc***
     /usr/local/cuda/bin/nvcc
     nvcc: NVIDIA (R) Cuda compiler driver
     Copyright (c) 2005-2021 NVIDIA Corporation
     Built on Sun_Feb_14_21:12:58_PST_2021
     Cuda compilation tools, release 11.2, V11.2.152
     Build cuda_11.2.r11.2/compiler.29618528_0

     ***Python***
     /raid/sding/miniconda3/envs/cudf_dev/bin/python
     Python 3.8.8

     ***Environment Variables***
     PATH                            : /home/u00u97shnnb9gHdDUD357/.vscode-server/bin/3c4e3df9e89829dce27b7b5c24508306b151f30d/bin:/raid/sding/miniconda3/envs/cudf_dev/bin:/raid/sding/miniconda3/condabin:/home/u00u97shnnb9gHdDUD357/.vscode-server/bin/3c4e3df9e89829dce27b7b5c24508306b151f30d/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/cuda/bin:/usr/local/cuda/bin
     LD_LIBRARY_PATH                 :
     NUMBAPRO_NVVM                   :
     NUMBAPRO_LIBDEVICE              :
     CONDA_PREFIX                    : /raid/sding/miniconda3/envs/cudf_dev
     PYTHON_PATH                     :

     ***conda packages***
     /raid/sding/miniconda3/condabin/conda
     # packages in environment at /raid/sding/miniconda3/envs/cudf_dev:
     #
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     _openmp_mutex             4.5                       1_gnu    conda-forge
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     backports                 1.0                        py_2    conda-forge
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     black                     19.10b0                    py_4    conda-forge
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     boost-cpp                 1.76.0               hc6e9bd1_0    conda-forge
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     brotlipy                  0.7.0           py38h497a2fe_1001    conda-forge
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     cachetools                4.2.2              pyhd8ed1ab_0    conda-forge
     certifi                   2020.12.5        py38h578d9bd_1    conda-forge
     cffi                      1.14.5           py38ha65f79e_0    conda-forge
     cfgv                      3.2.0                      py_0    conda-forge
     chardet                   4.0.0            py38h578d9bd_1    conda-forge
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     cmake                     3.18.5               h1f3970d_0    rapidsai-nightly
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     cupy                      8.0.0            py38hb7c6141_0    rapidsai
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     dask                      2021.4.1+17.gc3993fd9          pypi_0    pypi
     dask-cudf                 0.20.0a0+280.g611cabd5ba.dirty          pypi_0    pypi
     dataclasses               0.8                pyhc8e2a94_1    conda-forge
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     distlib                   0.3.1              pyh9f0ad1d_0    conda-forge
     distributed               2021.4.1+12.g1ee22c84          pypi_0    pypi
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     double-conversion         3.1.5                h9c3ff4c_2    conda-forge
     editdistance-s            1.0.0            py38h1fd1430_1    conda-forge
     entrypoints               0.3             pyhd8ed1ab_1003    conda-forge
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     importlib-metadata        4.0.1            py38h578d9bd_0    conda-forge
     iniconfig                 1.1.1              pyh9f0ad1d_0    conda-forge
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     ipython_genutils          0.2.0                      py_1    conda-forge
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beckernick commented 3 years ago

This came up while @shaneding was working on #7997 , as this presents when ~accessing~ returning list.leaves

beckernick commented 3 years ago

Thinking more, the monotonically increasing index in the original example is due to how this is constructed here (from a cuDF object). I think this may simply be fine as is. The computed index is just the collection of the the underlying indexes.

kkraus14 commented 3 years ago

I think specifically that the character_tokenize function resets the index because there isn't a clean way to maintain it, so when the function is run against each dask partition, each partition gets a reset index.

github-actions[bot] commented 2 years ago

This issue has been labeled inactive-90d due to no recent activity in the past 90 days. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed.

vyasr commented 1 year ago

@beckernick do you think there's anything to do here, or should we close this issue as expected behavior?

vyasr commented 3 months ago

Hmm the current results here seem to have gotten worse. @beckernick WDYT of this? I'm not familiar with the API or what it's meant to do, but this seems quite wrong.

In [105]: import cudf
     ...: import dask_cudf
     ...: s = cudf.Series(["ab", "cd", "ef", "gh", "ij"])
     ...: ds = dask_cudf.from_cudf(s, 2)
     ...: print(ds.compute())
     ...: print(ds.map_partitions(lambda x: x.str.character_tokenize(), meta=ds._meta).compute())
0    ab
1    cd
2    ef
3    gh
4    ij
dtype: object
0    a
0    b
1    c
1    d
2    e
2    f
3    j
3    
4    
4    
dtype: object