# ModuleNotFoundError: No module named '\_lzma' **URL:** \ **Category:** vision\ **Created:** [April 30, 2021, 8:17am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894 "2021-04-30T08:17:21Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 8:17am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/1 "2021-04-30T08:17:22Z")
I’m using python 3.7.10 with torch 1.81 and torchvision 0.9.1 in my machine and while importing dset from torchvision.dataset this error shows up: ```auto Traceback (most recent call last): File "train.py", line 23, in from dataloader import load_data File "/home/rdb/Prithviraj/Image-Restoration-in-Occluded-Images-using-GANs/dataloader.py", line 3, in import torchvision.datasets as dset File "/home/rdb/.local/lib/python3.7/site-packages/torchvision/ __init__.py", line 7, in from torchvision import datasets File "/home/rdb/.local/lib/python3.7/site-packages/torchvision/datasets/ __init__.py", line 6, in from .mnist import MNIST, EMNIST, FashionMNIST, KMNIST, QMNIST File "/home/rdb/.local/lib/python3.7/site-packages/torchvision/datasets/mnist.py", line 11, in import lzma File "/usr/local/lib/python3.7/lzma.py", line 27, in from _lzma import * ModuleNotFoundError: No module named '_lzma' ``` This means that the torchvision I have is broken or buggy. Can someone suggest a fix for this error. If u need a demo code to run then please use [this](https://pytorch.org/tutorials/beginner/dcgan_faces_tutorial.html) tutorial . Any help would be great!! ---
**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\ **Post date:** [April 30, 2021, 8:31am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/2 "2021-04-30T08:31:10Z")
It seems that the usage of `lzma` was removed in the [master branch](https://github.com/pytorch/vision/blob/58afa5110ce65c718dea676eccc5783d7e56d07a/torchvision/datasets/mnist.py#L9), but for `0.9.1` you could try to install it via `pip` or `conda`. ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 8:34am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/3 "2021-04-30T08:34:16Z")
is it this command? `pip install backports.lzma` ---
**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\ **Post date:** [April 30, 2021, 8:38am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/4 "2021-04-30T08:38:00Z")
This could work. However, note that `lzma` should be a default Python package starting from [Python 3.5](https://docs.python.org/3.5/library/lzma.html), so unsure why it’s missing in your environment. A related issue is [here](https://github.com/pytorch/vision/issues/2921) with more suggestions. ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 8:45am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/5 "2021-04-30T08:45:19Z")
Ya, i have read this thread and it says that the fix is to do lazy import or something. But I don’t really understand it as \_lmza should be imported by default when torchvision is imported. and as you said it is a default python package but the difference is I’m using python version 3.7.10 and you have mentioned about python3.5 Any suggestions what I should do next? ---
**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\ **Post date:** [April 30, 2021, 8:51am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/6 "2021-04-30T08:51:52Z")
You could follow [this advice](https://github.com/pytorch/vision/issues/2921#issuecomment-811767491), install the missing library, and then reinstall Python so that it’ll add the support. Alternatively, you could also search for other standalone Python libs (such as in your previous suggestion), but I haven’t tried to install any of them. ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 8:56am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/7 "2021-04-30T08:56:16Z")
I tried to install that package but it says that the package is already up to date ```auto sudo apt-get install -y liblzma-dev Reading package lists... Done Building dependency tree Reading state information... Done liblzma-dev is already the newest version (5.1.1alpha+20120614-2ubuntu2). 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. ``` So it wasn’t missing in the first place… ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 8:59am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/8 "2021-04-30T08:59:11Z")
So there might a issue in torchvision. > [@ptrblck](#): > > A related issue is [here](https://github.com/pytorch/vision/issues/2921) with more suggestions. The thread here says that torchvision works fine with version 0.7.0 do u recommend downgrading the version? (if so then please also show how to) ---
**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\ **Post date:** [April 30, 2021, 9:49am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/9 "2021-04-30T09:49:03Z")
I don’t think it’s an issue in `torchvision`, as `lzma` should be a default Python package, and thus it would be a valid dependency. I don’t know why your Python setup isn’t recognizing it, so you might need to create a new environment maybe. ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 11:40am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/10 "2021-04-30T11:40:51Z")
I listed down all the packages of python using `help("modules")` ```auto PIL _weakrefset heapq scipy __future__ _xxtestfuzz hmac seaborn _abc abc html secrets _ast absl http select _asyncio aifc idlelib selectors _bisect antigravity imaplib setuptools _blake2 argparse imghdr shelve _bootlocale array imp shlex _bz2 ast importlib shutil _codecs asynchat inspect signal _codecs_cn asyncio io site _codecs_hk asyncore ipaddress six _codecs_iso2022 atexit itertools smtpd _codecs_jp audioop json smtplib _codecs_kr base64 keyword sndhdr _codecs_tw bdb kiwisolver socket _collections binascii lib2to3 socketserver _collections_abc binhex linecache spwd _compat_pickle bisect locale sqlite3 _compression builtins logging sre_compile _contextvars bz2 lzma sre_constants _crypt cProfile macpath sre_parse _csv caffe2 mailbox ssl _ctypes calendar mailcap stat _ctypes_test cgi marshal statistics _curses cgitb math string _curses_panel chunk matplotlib stringprep _datetime cmath mimetypes struct _dbm cmd mmap subprocess _decimal code modulefinder sunau _dummy_thread codecs multiprocessing symbol _elementtree codeop netrc symtable _functools collections nis sys _gdbm colorsys nntplib sysconfig _hashlib compileall ntpath syslog _heapq concurrent nturl2path tabnanny _imp configparser numbers tarfile _io contextlib numpy telnetlib _json contextvars opcode tempfile _locale copy operator termios _lsprof copyreg optparse test _markupbase crypt os textwrap _md5 csv ossaudiodev this _multibytecodec ctypes pandas threading _multiprocessing curses parser time _opcode cycler pathlib timeit _operator dataclasses pdb tkinter _osx_support datetime pickle token _pickle dateutil pickletools tokenize _posixsubprocess dbm pip torch _py_abc decimal pipes torchaudio _pydecimal difflib pkg_resources torchvision _pyio dis pkgutil trace _queue distutils platform traceback _random doctest plistlib tracemalloc _remote_module_non_sriptable dummy_threading poplib tty _sha1 easy_install posix turtle _sha256 email posixpath turtledemo _sha3 encodings pprint types _sha512 ensurepip profile typing _signal enum pstats typing_extensions _sitebuiltins errno pty unicodedata _socket faulthandler pwd unittest _sqlite3 fcntl py_compile urllib _sre filecmp pyclbr uu _ssl fileinput pydoc uuid _stat fnmatch pydoc_data venv _string formatter pyexpat warnings _strptime fractions pylab wave _struct ftplib pyparsing weakref _symtable functools pytz webbrowser _sysconfigdata_m_linux_x86_64-linux-gnu gc queue wsgiref _testbuffer genericpath quopri xdrlib _testcapi get-pip random xml _testimportmultiple getopt re xmlrpc _testmultiphase getpass readline xxlimited _thread gettext reprlib xxsubtype _threading_local glob resource zipapp _tracemalloc grp rlcompleter zipfile _warnings gzip runpy zipimport _weakref hashlib sched zlib ``` and as you can see there is no package called \_lmza So know that we have established that I don’t have this package, how should I add it ? By now, I have tried using the following commands: ```auto pip install backports.lzma pip install pylzma sudo apt-get install liblzma-dev ``` For the first two there is a error with a long traceback call. while the 3rd command give this output: > [@Xanthan](#): > > ```auto > Reading package lists... Done > Building dependency tree > Reading state information... Done > liblzma-dev is already the newest version (5.1.1alpha+20120614-2ubuntu2). > 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. > > ``` ---
**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\ **Post date:** [April 30, 2021, 7:01pm UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/11 "2021-04-30T19:01:47Z")
The `_lzma` module is internal and your list shows indeed an available `lzma` module. In my current environment it’s located at: ```auto /anaconda3/envs/pytorch_181_cuda102/lib/python3.8/lzma.py ``` Could you check, if a direct import also fails: ```python import lzma ``` ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 7:15pm UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/12 "2021-04-30T19:15:27Z")
yes the import fails. ```auto import lmza Traceback (most recent call last): File "", line 1, in ModuleNotFoundError: No module named 'lmza' ``` ---
**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\ **Post date:** [April 30, 2021, 7:30pm UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/13 "2021-04-30T19:30:25Z")
Something still seems to be strange in your Python setup. Which Python version are you using and are you seeing the `lzma.py` file in the `pythonMAJOR.MINOR` dir? ---
**Author:** ![Xanthan](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/xanthan/32/37484_2.png) [@Xanthan](https://discuss.pytorch.org/u/Xanthan)\ **Post date:** [April 30, 2021, 7:59pm UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/14 "2021-04-30T19:59:35Z")
I’m using python 3.7.10. > [@ptrblck](#): > > `lzma.py` file in the `pythonMAJOR.MINOR` dir? Can you please mention where can I find the pythonMAJOR.MINOR? ---
**Author:** ![Qazaq159](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/qazaq159/32/56082_2.png) [@Qazaq159](https://discuss.pytorch.org/u/Qazaq159)\ **Post date:** [January 1, 2023, 9:00am UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/15 "2023-01-01T09:00:57Z")
Reinstall env libs helped me to solve this issue. Recommend to try again(resinstall python, reinstall virtualenv and its requirements libs). ---
**Author:** ![bolkogor](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/bolkogor/32/68454_2.png) [@bolkogor](https://discuss.pytorch.org/u/bolkogor)\ **Post date:** [March 13, 2024, 7:21pm UTC](https://discuss.pytorch.org/t/modulenotfounderror-no-module-named-lzma/119894/16 "2024-03-13T19:21:01Z")
I had the same issue using debian, and solved it by removing lzma import in `{venv_dir}/.../torchvision/datasets/utils.py` On line ~240 of `utils.py` I replaced lzma with: ```auto def raise_lzma(*args, **kwargs): raise Exception('lzma removed error') _COMPRESSED_FILE_OPENERS: Dict[str, Callable[..., IO]] = { ".bz2": bz2.open, ".gz": gzip.open, ".xz": raise_lzma, } ``` It works if you don’t need compression and do not have sudo access to install `liblzma-dev` and recompile python.