Default pip installation of Dask gives "ImportError: No module named toolz"
Question:
I installed Dask using pip like this:
pip install dask
and when I try to do import dask.dataframe as dd I get the following error message:
>>> import dask.dataframe as dd
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/path/to/venv/lib/python2.7/site-packages/dask/__init__.py", line 5, in <module>
from .async import get_sync as get
File "/path/to/venv/lib/python2.7/site-packages/dask/async.py", line 120, in <module>
from toolz import identity
ImportError: No module named toolz
No module named toolz
I noticed that the documentation states
pip install dask: Install only dask, which depends only on the standard library. This is appropriate if you only want the task schedulers.
so I’m confused as to why this didn’t work.
Answers:
In order to use Dask’s parallelized dataframes (built on top of pandas), you have to tell pip to install some “extras” (reference), as mentioned in the Dask installation documentation:
pip install "dask[dataframe]"
Or you could just do
pip install "dask[complete]"
to get the whole bag of tricks. NB: The double-quotes may or may not be required in your shell.
The justification for this is (or was) mentioned in the Dask documentation:
We do this so that users of the lightweight core dask scheduler aren’t required to download the more exotic dependencies of the collections (numpy, pandas, etc.)
As mentioned in Obinna’s answer, you may wish to do this inside a virtualenv, or use pip install --user to put the libraries in your home directory, if, say, you don’t have admin privileges on to the host OS.
Extra details
At Dask 0.13.0 and below, there was a requirement on toolz‘ identity function within dask/async.py. There is an open a closed pull request associated with GitHub issue #1849 to remove this dependency. In the meantime If, for some reason, you are stuck with an older version of dask, you can work around that particular issue by simply doing pip install toolz.
But this wouldn’t (completely) fix your problem with import dask.dataframe as dd anyway. Because you’d still get this error:
>>> import dask.dataframe as dd
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/data/staff_agbio/PhyloWeb/data/dask-test/venv/local/lib/python2.7/site-packages/dask/dataframe/__init__.py", line 3, in <module>
from .core import (DataFrame, Series, Index, _Frame, map_partitions,
File "/data/staff_agbio/PhyloWeb/data/dask-test/venv/local/lib/python2.7/site-packages/dask/dataframe/core.py", line 12, in <module>
import pandas as pd
ImportError: No module named pandas
or if you had pandas installed already, you’d get ImportError: No module named cloudpickle. So, pip install "dask[dataframe]" seems to be the way to go if you’re in this situation.
I had this same issue and this was what fixed it for me.
- Create a virtual env for your project
- Cd your project directory (not required if you’re good with directory navigation)
- Activate you virtual env
pip install "dask[complete]" : This will install everything. You may wish to install only a given component like dataframe, then use pip install "dask[dataframe]"
The bottomline was that I had to be in my virtual environment; this would install dask for this env only.
requeriments.txt working:
awscli==1.16.69
botocore=1.13.0
boto3==1.9.79
numpy==1.16.2
dask[complete]
In my case, using anaconda on windows machine, here are the steps that solved this issue:
- conda install dask
- conda install dask-core
- Install this based on a
github comment !pip install tornado==5.0.0 distributed==2.15 dask-ml[complete]
- restart my anaconda.
Use the below command.
pip install "dask[dataframe]"
You can check the ss below:
The error i got
Dask version
You can solve this situation like this:
-
Find daskpack from pypi https://pypi.org/project/dask/2022.5.0/
-
Check the required python version for the dask version selected from the requirements.
-
Find the dask package suitable for your python version from the release history page of the pypi dask page.
-
Go back to colab and remove dask completely
!pip uninstall dask
-
Install the dask version you just found
example : !pip install dask==2022.2.0
-
Your dask version should be the same as your distributed version. For this, find the distributed version corresponding to your dask version from pypi
-
Uninstall distributed from colab
!pip uninstall distributed
-
Install the appropriate distributed version
ex: !pip install distributed==2022.2.0
-
install auto-sklearn
pip install auto-sklearn
note: auto-sklearn must be installed for each colab notebook and since colab will delete these changes after 12 hours, it must be installed from the beginning.
footnote: you can correct me for my mistakes and omissions. I hope the problem is solved for you as it was solved for me.
I installed Dask using pip like this:
pip install dask
and when I try to do import dask.dataframe as dd I get the following error message:
>>> import dask.dataframe as dd
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/path/to/venv/lib/python2.7/site-packages/dask/__init__.py", line 5, in <module>
from .async import get_sync as get
File "/path/to/venv/lib/python2.7/site-packages/dask/async.py", line 120, in <module>
from toolz import identity
ImportError: No module named toolz
No module named toolz
I noticed that the documentation states
pip install dask: Install only dask, which depends only on the standard library. This is appropriate if you only want the task schedulers.
so I’m confused as to why this didn’t work.
In order to use Dask’s parallelized dataframes (built on top of pandas), you have to tell pip to install some “extras” (reference), as mentioned in the Dask installation documentation:
pip install "dask[dataframe]"
Or you could just do
pip install "dask[complete]"
to get the whole bag of tricks. NB: The double-quotes may or may not be required in your shell.
The justification for this is (or was) mentioned in the Dask documentation:
We do this so that users of the lightweight core dask scheduler aren’t required to download the more exotic dependencies of the collections (numpy, pandas, etc.)
As mentioned in Obinna’s answer, you may wish to do this inside a virtualenv, or use pip install --user to put the libraries in your home directory, if, say, you don’t have admin privileges on to the host OS.
Extra details
At Dask 0.13.0 and below, there was a requirement on toolz‘ identity function within dask/async.py. There is an open a closed pull request associated with GitHub issue #1849 to remove this dependency. In the meantime If, for some reason, you are stuck with an older version of dask, you can work around that particular issue by simply doing pip install toolz.
But this wouldn’t (completely) fix your problem with import dask.dataframe as dd anyway. Because you’d still get this error:
>>> import dask.dataframe as dd
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/data/staff_agbio/PhyloWeb/data/dask-test/venv/local/lib/python2.7/site-packages/dask/dataframe/__init__.py", line 3, in <module>
from .core import (DataFrame, Series, Index, _Frame, map_partitions,
File "/data/staff_agbio/PhyloWeb/data/dask-test/venv/local/lib/python2.7/site-packages/dask/dataframe/core.py", line 12, in <module>
import pandas as pd
ImportError: No module named pandas
or if you had pandas installed already, you’d get ImportError: No module named cloudpickle. So, pip install "dask[dataframe]" seems to be the way to go if you’re in this situation.
I had this same issue and this was what fixed it for me.
- Create a virtual env for your project
- Cd your project directory (not required if you’re good with directory navigation)
- Activate you virtual env
pip install "dask[complete]": This will install everything. You may wish to install only a given component like dataframe, then usepip install "dask[dataframe]"
The bottomline was that I had to be in my virtual environment; this would install dask for this env only.
requeriments.txt working:
awscli==1.16.69
botocore=1.13.0
boto3==1.9.79
numpy==1.16.2
dask[complete]
In my case, using anaconda on windows machine, here are the steps that solved this issue:
- conda install dask
- conda install dask-core
- Install this based on a
github comment !pip install tornado==5.0.0 distributed==2.15 dask-ml[complete] - restart my anaconda.
Use the below command.
pip install "dask[dataframe]"
You can check the ss below:
The error i got
Dask version
You can solve this situation like this:
-
Find daskpack from pypi https://pypi.org/project/dask/2022.5.0/
-
Check the required python version for the dask version selected from the requirements.
-
Find the dask package suitable for your python version from the release history page of the pypi dask page.
-
Go back to colab and remove dask completely
!pip uninstall dask -
Install the dask version you just found
example : !pip install dask==2022.2.0 -
Your dask version should be the same as your distributed version. For this, find the distributed version corresponding to your dask version from pypi
-
Uninstall distributed from colab
!pip uninstall distributed -
Install the appropriate distributed version
ex: !pip install distributed==2022.2.0 -
install auto-sklearn
pip install auto-sklearn
note: auto-sklearn must be installed for each colab notebook and since colab will delete these changes after 12 hours, it must be installed from the beginning.
footnote: you can correct me for my mistakes and omissions. I hope the problem is solved for you as it was solved for me.