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Error importing sklearn

Python version : 3.5.2
I getting started with machine learning and things... So I installed sklearn and some other packages form pip. All of them were able to be installed successfully except sklearn so, I downloaded the wheel and installed it from here. It was successfully installed but when i tried to import it in the order to check correct installation, I got tons of error :
Traceback (most recent call last):
File "C:\MyFiles\Programs\Python\PlayGround.py", line 1, in
import sklearn
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\sklearn__init__.py", line 134, in
from .base import clone
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\sklearn\base.py", line 12, in
from .utils.fixes import signature
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\sklearn\utils__init__.py", line 11, in
from .validation import (as_float_array,
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\sklearn\utils\validation.py", line 18, in
from ..utils.fixes import signature
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\sklearn\utils\fixes.py", line 144, in
from scipy.sparse.linalg import lsqr as sparse_lsqr # noqa
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\scipy\sparse\linalg__init__.py", line 114, in
from .isolve import *
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\scipy\sparse\linalg\isolve__init__.py", line 6, in
from .iterative import *
File "C:\Users\Vaibhav Acharya\AppData\Local\Programs\Python\Python35\lib\site-packages\scipy\sparse\linalg\isolve\iterative.py", line 7, in
from . import _iterative
ImportError: DLL load failed: The specified module could not be found.
And the code was just :
import sklearn
I have already checked correct version of wheel package which, I have downloaded.
How can I correct it and why it is occurring?

The following steps solved my problem :
Uninstalling numpy, sklearn and scipy.
Downloading numpy+mkl and scipy from here.
Firstly installing numpy+mkl and then scipy.
Installing sklearn from pip.

Various things need to be checked:
Check numpy, scipy installation versions.
If they are correct then try to import numpy and scipy.
If they getting imported correctly, then clear your temp(c:/users/username/Appdata/local/temp)folder. Restart the machine and try again.
Still if doesn't work, then uninstall scipy, numpy , sklearn and
reinstall the proper wheel files

Download and install numpy+mkl file.
Currently you might have installed only the numpy file.
Go to: https://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy
Download the corresponding wheel file in which is suitable for your python installation
pip install "/path_to_thefile/numpy-1.14.6+mkl-cp36-cp36m-win_amd64.whl"
This should help you

Installing Matplotlib in Windows 10 64bits

Could anyone tell me what files I should download and which statements I must execute in the command line to install Matplotlib?
I have Python 2.7.13 on Windows 10 64 bit.
These are the files I unzipped:
All downloaded from: http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy
Commands I executed:
python -m pip install -U pip setuptools
python -m pip install matplotlib
python -m pip install -U pip
I am getting these two errors when checking if Numpy and Matplotlib are installed.
>>> import numpy
**Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
import numpy
File "numpy\__init__.py", line 142, in <module>
from . import add_newdocs
File "numpy\add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "numpy\lib\__init__.py", line 8, in <module>
from .type_check import *
File "numpy\lib\type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "numpy\core\__init__.py", line 26, in <module>
raise ImportError(msg)
ImportError:
Importing the multiarray numpy extension module failed. Most
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control). Otherwise reinstall numpy.
Original error was: DLL load failed: %1 no es una aplicación Win32 válida.**
>>> import matplotlib
Traceback (most recent call last):
File "<pyshell#4>", line 1, in <module>
import matplotlib
File "matplotlib\__init__.py", line 122, in <module>
from matplotlib.cbook import is_string_like, mplDeprecation, dedent, get_label
File "matplotlib\cbook.py", line 33, in <module>
import numpy as np
File "numpy\__init__.py", line 142, in <module>
from . import add_newdocs
File "numpy\add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "numpy\lib\__init__.py", line 8, in <module>
from .type_check import *
File "numpy\lib\type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "numpy\core\__init__.py", line 26, in <module>
raise ImportError(msg)
ImportError:
Importing the multiarray numpy extension module failed. Most
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control). Otherwise reinstall numpy.
Original error was: DLL load failed: %1 no es una aplicación Win32 válida.

This is a common issue for windows users. And you will probably need precompiled packages for some other libraries as well, e.g. scipy.
You will find on SourceForge the numpy superpack whose name structure is numpy-X.X.X-win32-superpack-python2.7.exe, e.g. numpy-1.9.2-win32-superpack-python2.7.
On Pypi (Python Package Index), you will find the matplotlib library, whose name structure is matplotlib-X.X.X.win32-py2.7.exe, e.g matplotlib-1.4.3.win32-py2.7.exe.

Installing matplotlib through pip by automatically downloading the files from the python index as you're trying to do here will most probably fail for windows.
There are two main options:
Install a complete distribution like Anaconda, Canopy, WinPython, etc. which already has all the respective libraries included.
Use precompiled wheels. A source for those is indeed this site by Christoph Gohlke. You would then need to make sure to install all dependencies first and matplotlib last. Starting with numpy is the best, then other dependencies, matplotlib last. To install those use
pip install <filename of wheel>
e.g.
pip install numpy‑1.13.0rc1+mkl‑cp27‑cp27m‑win_amd64.whl

RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9

I'm going through the API tutorial on New Coder (this one) and got the following error when I try to run the program:
RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9Traceback (most recent call last):
File "api.py", line 7, in <module>
import matplotlib.pyplot as plt
File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 27, in <module>
import matplotlib.colorbar
File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/colorbar.py", line 32, in <module>
import matplotlib.artist as martist
File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/artist.py", line 12, in <module>
from .transforms import Bbox, IdentityTransform, TransformedBbox, \
File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/transforms.py", line 39, in <module>
from matplotlib._path import (affine_transform, count_bboxes_overlapping_bbox,
ImportError: numpy.core.multiarray failed to import
I know it isn't my code because I tried running it with the example code too and had the same issue. One answer I saw suggested on here was to try Numpy 1.8, but that didn't work either.
Also, all of this is set up within a virtual environment as directed so I don't think it's an issue of what I have installed elsewhere.

Installing packets from file with requirements may cause failures. I mean something like pip install -r requirements.txt
It seems to me that pip just installs packets in order without dependencies (first line from file, second line, ...).
I had same issue because of having installed numpy outside of environment and numpy after matplotlib in requirements.txt Pip compiled matplotlib with system nympy, after that it installed new numpy and nothing worked.
I just have switched strings and set matplotlib after numpy. Now it works.

Try this:
pip install numpy --upgrade
It works for me

Installation of nltk and scikit-learn

I have been trying to install and use scikit-learn and nltk. However, I get the following error while importing anything:
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/site-packages/sklearn/init.py", line 57, in
from .base import clone
File "/usr/local/lib/python2.7/site-packages/sklearn/base.py", line 11, in
from .utils.fixes import signature
File "/usr/local/lib/python2.7/site-packages/sklearn/utils/init.py", line 10, in
from .murmurhash import murmurhash3_32
File "numpy.pxd", line 155, in init sklearn.utils.murmurhash (sklearn/utils/murmurhash.c:5029)
ValueError: numpy.dtype has the wrong size, try recompiling
I did a pip uninstall numpy followed by a pip install numpy and also a pip uninstall scikit-learn and again reinstalled it. But the error persists.

I met the same problem today. Now I have solved it.
Because I have installed numPy manually, and I use the command "pip" to install the else package.
Solve way:
find the old version of numPy.
You can import numPy and print the path of it.
delete the folder.
use pip to install again.

ImportError: No module named 'numpy.ma'

The full error:
import matplotlib
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
import matplotlib
File "R:\Python34\lib\site-packages\matplotlib\__init__.py", line 180, in <module>
from matplotlib.cbook import is_string_like
File "R:\Python34\lib\site-packages\matplotlib\cbook.py", line 34, in <module>
import numpy.ma as ma
ImportError: No module named 'numpy.ma'
numpy is imported normally.
How do I install numpy.ma?

I also faced the same situation today. I found that I had saved a file as numpy.py, so check the filenames in your folder.

Re-install the correct version of numpy.
download correct .whl file from http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy
pip install C:\Path\To\Wheel\Filename.whl # for example: numpy-1.9.2+mkl-cp34-none-win_amd64.whl

Use Your (via terminal) package manager and search.
Example on Ubuntu:
aptitude search numpy
and install package.
In my case:
apt-get install python-numpy