Dali: ImportError: No module named 'nvidia.dali.backend_impl'

[shl666]

I installed DALI from Github source code with -DBUILD_BENCHMARK=OFF -DBUILD_TEST=OFF.

$pip install dali/python
Processing ./dali/python
Requirement already satisfied: future in /home/smluo/anaconda3/envs/python35/lib/python3.5/site-packages (from nvidia-dali==0.1.2) (0.16.0)
Building wheels for collected packages: nvidia-dali
  Running setup.py bdist_wheel for nvidia-dali ... done
  Stored in directory: /tmp/pip-ephem-wheel-cache-9rajff1s/wheels/b0/e3/0c/a10e99a91add74c139be5536d877b989f41a54107cb0921e40
Successfully built nvidia-dali
Installing collected packages: nvidia-dali
  Found existing installation: nvidia-dali 0.1.2
    Uninstalling nvidia-dali-0.1.2:
      Successfully uninstalled nvidia-dali-0.1.2
Successfully installed nvidia-dali-0.1.2

I can import nvidia but it seems nvidia.dali.backend_impl is missing.

In [1]: import nvidia

In [2]: from nvidia.dali.pipeline import Pipeline
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-ba5fedadd8b7> in <module>()
----> 1 from nvidia.dali.pipeline import Pipeline

~/anaconda3/envs/python35/lib/python3.5/site-packages/nvidia/dali/__init__.py in <module>()
     15 from __future__ import absolute_import
     16
---> 17 from . import ops
     18 from . import pipeline
     19 from . import tensor

~/anaconda3/envs/python35/lib/python3.5/site-packages/nvidia/dali/ops.py in <module>()
     17 import copy
     18 from itertools import count
---> 19 from nvidia.dali import backend as b
     20 from nvidia.dali.tensor import TensorReference
     21 from future.utils import with_metaclass

~/anaconda3/envs/python35/lib/python3.5/site-packages/nvidia/dali/backend.py in <module>()
     13 # limitations under the License.
     14
---> 15 from nvidia.dali.backend_impl import *
     16
     17 # Note: If we every need to add more complex functionality

ImportError: No module named 'nvidia.dali.backend_impl'

[JanuszL]

Hi,
Please check if backend_impl.so is created in your _BUILD_DIR_/dali/python/nvidia/dali/backend_impl.so.
@cliffwoolley - as I understand with local build and install it should work like that?

[cliffwoolley]

Yes, it should. However, are you doing make install or just make? There are some issues (I didn't _think_ this was one of them?) if you build but didn't install.

[shl666]

@JanuszL
There is no file called backend_impl.so, but one named backend_impl.cpython-36m-x86_64-linux-gnu.so .

@cliffwoolley
I checked my bash_history, I do use make -j"$(nproc)" install.

[cliffwoolley]

That's the correct filename, yes. So now the question is why this library is not being found at runtime. I'm pretty sure this is a bug, even if I don't (yet) actually understand what it is about your Conda env that would lead to the error. Do you get the same error if you install DALI from the pre-built wheels instead of from source?

[cliffwoolley]

@shl666 - Any additional info you could provide to help me reproduce the issue would be appreciated. Particularly, the CMakeCache.txt (if you are able to provide it) and the exact sequence of build and install commands you ran (including the make install command you referenced above from your bash history). Thanks in advance!

[shl666]

Hi cliff,
I am working on a remote server (do not have administrator rights).
When I tried to get the pre-built wheels, following error would occur:

$pip install --trusted-host pypi.python.org --extra-index-url https://developer.download.nvidia.com/compute/redist nvidia-dali
Looking in indexes: https://pypi.org/simple, https://developer.download.nvidia.com/compute/redist
Collecting nvidia-dali
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),)': /compute/redist/nvidia-dali/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),)': /compute/redist/nvidia-dali/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),)': /compute/redist/nvidia-dali/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),)': /compute/redist/nvidia-dali/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),)': /compute/redist/nvidia-dali/
  Could not fetch URL https://developer.download.nvidia.com/compute/redist/nvidia-dali/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='developer.download.nvidia.com', port=443): Max retries exceeded with url: /compute/redist/nvidia-dali/ (Caused by SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),)) - skipping
  Could not find a version that satisfies the requirement nvidia-dali (from versions: )
No matching distribution found for nvidia-dali

Since I can not install package under /usr/local/..., I have to replace {CMAKE_INSTALL_PREFIX} in dali/cmake_install.cmake: row 35/42/56, dali/pipeline/cmake_install.cmake: row 36 and dali/cmake_install.cmake: row 62 by my own conda environment path.

CMakeCache.txt:

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# It was generated by CMake: /usr/bin/cmake
# You can edit this file to change values found and used by cmake.
# If you do not want to change any of the values, simply exit the editor.
# If you do want to change a value, simply edit, save, and exit the editor.
# The syntax for the file is as follows:
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build&install:

git clone –recursive https://github.com/NVIDIA/dali
cd dali
mkdir build
cd build
cmake –DBUILD_LMDB=ON -DNVJPEG_ROOT_DIR=/path/to/nvJPEG -DBUILD_BENCHMARK=OFF -DBUILD_TEST=OFF ..
make -j"$(nproc)" install
pip install dali/python

[cliffwoolley]

Thanks very much for the detailed information. We will have our web team look into the certificate error.

You can actually select the install prefix from the CMake command line without modifying CMakeLists.txt; we should document that.

[shl666]

@cliffwoolley Great.
Looking forward to your reply.

[JanuszL]

Tracked internally DALI-151.

[JanuszL]

Try to use with cmake:
-DCMAKE_INSTALL_PREFIX=_INSTALLATION_PATH_
Then make install will install in given directory.

[shl666]

@JanuszL Perfect. It works and no need to modify cmake file.
But the error ImportError: No module named 'nvidia.dali.backend_impl' remains.

[cliffwoolley]

One last experiment to try: I'm wondering if there is some interaction here between the CMake install and pip install.

Can you try this?
cmake .. -DCMAKE_INSTALL_PREFIX=. ...
Then make install and pip install the same way as you did before. This has the counterintuitive result of "installing" into the build directory as far as CMake is concerned, but then pip install will do the "real" installation anyway. Does that make any difference to the observed behavior?

[shl666]

@cliffwoolley
I did this 10 mins ago and I do not need to modify the cmake file.

But the ImportError remains:
ImportError: No module named 'nvidia.dali.backend_impl

[cliffwoolley]

You installed _into the build directory_? If so okay, but that wasn't clear before. Another way to say what I mean is -DCMAKE_INSTALL_PREFIX=$PWD

[shl666]

It remains the same result.

But I notice that

(several omitted lines)
.
.
[ 97%] Linking CXX shared library libdali.so
make[2]: warning:  Clock skew detected.  Your build may be incomplete.
[ 97%] Built target dali
make[2]: Warning: File 'dali/python/CMakeFiles/backend_impl.dir/flags.make' has modification time 343 s in the future
Scanning dependencies of target backend_impl
make[2]: warning:  Clock skew detected.  Your build may be incomplete.
make[2]: Warning: File 'dali/python/CMakeFiles/backend_impl.dir/flags.make' has modification time 343 s in the future
[ 98%] Building CXX object dali/python/CMakeFiles/backend_impl.dir/backend_impl.cc.o
[100%] Linking CXX shared module nvidia/dali/backend_impl.cpython-36m-x86_64-linux-gnu.so
make[2]: warning:  Clock skew detected.  Your build may be incomplete.
[100%] Built target backend_impl
make[1]: warning:  Clock skew detected.  Your build may be incomplete.
make[1]: Warning: File 'CMakeFiles/Makefile2' has modification time 324 s in the future
make[1]: warning:  Clock skew detected.  Your build may be incomplete.
.
(several omitted lines)
.
make: warning:  Clock skew detected.  Your build may be incomplete.

May help.

[shl666]

@cliffwoolley I installed pkg-config and undo comment out operation of find_package(JpegTurbo 1.5 REQUIRED). It solves the warning I mentioned above.

$make -j"$(nproc)" install
[  0%] Built target libdali.map
[  3%] Built target DALI_PROTO
[  4%] Built target CAFFE_PROTO
[  8%] Built target CAFFE2_PROTO
[ 11%] Built target TF_PROTO
[ 12%] Linking CXX shared library libdali.so
[ 97%] Built target dali
[ 98%] Linking CXX shared module nvidia/dali/backend_impl.cpython-36m-x86_64-linux-gnu.so
[100%] Built target backend_impl
Install the project...
.
.
.

[shl666]

A very strange thing was happened.

I tried to uninstall dali by using;

pip uninstall -y nvidia-dali

And then I tried to import nvidia.dali, it works without any error.

Then I tried to install dali again. But after that, the previous ImportError occurs.

It may because I have successfully installed DALI in one of my environment path before I guess.

[shl666]

Oh I found out the reason. Because when I uninstall DALI, the file directory nvidia/dali hasn't been deleted. Now I installed it both build directory and my conda environment. Python still can not find dali.backend_impl

[JanuszL]

To be sure that you updated your installation, after every rebuild issue:

pip install --upgrade nvidia-dali

[cliffwoolley]

I'm going to close this for now; if you encounter it again, please let us know. Thanks!