ImportError: No module named kinematics_dynamics running exampleCartesianControlClient.py

Question

ImportError: No module named kinematics_dynamics running exampleCartesianControlClient.py

Closed this issue 7 years ago · 27 comments

I want to run the exampleCartesianControlClient.py but it shows this error:

Traceback (most recent call last):
  File "exampleCartesianControlClient.py", line 4, in <module>
    import kinematics_dynamics
ImportError: No module named kinematics_dynamics

I've followed the steps described to install kinematics-dynamics but maybe there is something I am passing over..

rsantos88 commented 7 years ago

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Answer 1 · 2018-02-26T12:17:47.000Z

True!

We must document how to install the bindings at https://github.com/roboticslab-uc3m/kinematics-dynamics/blob/develop/doc/kinematics-dynamics-install.md !!

Answer 2 · 2018-02-26T12:17:54.000Z

I presume you compiled bindings. Did you set LD_LIBRARY_PATH and PYTHONPATH to the directories the .so and .py files are built in, respectively?

Answer 3 · 2018-02-26T12:18:53.000Z

Also, in Python, extra care should be taken with Python 2 vs 3 (e.g. paths 2.7 and 3.5m).

Answer 4 · 2018-02-26T13:54:38.000Z

Added bindings section at https://github.com/roboticslab-uc3m/kinematics-dynamics/blob/develop/doc/kinematics-dynamics-install.md#install-bindings (swig + python)

@rsantos88 Would be great if you could beta-test and provide feedback!

Answer 5 · 2018-02-27T12:01:26.000Z

Ok. Some notes:

I presume you compiled bindings. Did you set LD_LIBRARY_PATH and PYTHONPATH to the directories the .so and .py files are built in, respectively?

I've inspected .bashrc file and this environmental variables are configured but, there are ok? . Here a small fragment:

export LD_LIBRARY_PATH=/usr/local/lib
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
export GST_PLUGIN_PATH=/usr/local/lib/gstreamer-1.0
export ROBOTICSLAB_SPEECH_DIR=/home/teo/repos/speech/build
export PYTHONPATH=$PYTHONPATH:`openrave-config --python-dir`
export ROBOTICSLAB_TOOLS_DIR=$HOME/repos/tools/build  # Points to where TEOConfig.cmake is generated $

# For CMake find_package(ROBOTICSLAB_KINEMATICS_DYNAMICS REQUIRED)
export ROBOTICSLAB_KINEMATICS_DYNAMICS_DIR=$HOME/repos/kinematics-dynamics/build

I've noticed that when I compile kinematics-dynamics and the binding, it can't find ROBOTICSLAB_YARP_DEVICES

teo@teo-oliver:~/repos/kinematics-dynamics/build$ cmake ..
-- YCM found in /usr/local/share/YCM.
-- Setting up installation of roboticslab-kinematics-dynamics.ini to /usr/local/share/yarp/config/path.d folder.
--  --- plugin AmorCartesianControl: disabled (dependencies unsatisfied)
--  --- plugin AsibotSolver: disabled (dependencies unsatisfied)
--  +++ plugin BasicCartesianControl: enabled
--  --- plugin BasicTwoLimbCartesianControl: disabled (dependencies unsatisfied)
--  +++ plugin CartesianControlClient: enabled
--  +++ plugin CartesianControlServer: enabled
--  +++ plugin KdlSolver: enabled
--  --- plugin TwoLimbCartesianControlServer: disabled
-- ROBOTICSLAB_YARP_DEVICES not found, building streamingDeviceController without sensor support
-- Configuring done
-- Generating done
-- Build files have been written to: /home/teo/repos/kinematics-dynamics/build

on the other hand, I've compiled and installed binding of kinematics-dinamics. Here is the cmake out information:

teo@teo-oliver:~/repos/kinematics-dynamics/bindings$ cmake .. -DCREATE_PYTHON=ON
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Setting build type to 'Release' as none was specified.
-- YCM found in /usr/local/share/YCM.
-- Setting up installation of roboticslab-kinematics-dynamics.ini to /usr/local/share/yarp/config/path.d folder.
CMake Warning at libraries/YarpTinyMathLib/CMakeLists.txt:4 (message):
  YARP math lib not found, disabling YarpTinyMathLib


CMake Warning at libraries/YarpPlugins/AmorCartesianControl/CMakeLists.txt:7 (message):
  AMOR_API package not found, disabling AmorCartesianControl


--  --- plugin AmorCartesianControl: disabled (dependencies unsatisfied)
CMake Warning at libraries/YarpPlugins/AsibotSolver/CMakeLists.txt:2 (message):
  YARP math lib not found, disabling AsibotSolver


--  --- plugin AsibotSolver: disabled (dependencies unsatisfied)
--  +++ plugin BasicCartesianControl: enabled
--  --- plugin BasicTwoLimbCartesianControl: disabled (dependencies unsatisfied)
--  +++ plugin CartesianControlClient: enabled
--  +++ plugin CartesianControlServer: enabled
--  +++ plugin KdlSolver: enabled
--  --- plugin TwoLimbCartesianControlServer: disabled
-- ROBOTICSLAB_YARP_DEVICES not found, building streamingDeviceController without sensor support
CMake Warning at tests/CMakeLists.txt:4 (message):
  GTestSources package not found, disabling tests


-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    CREATE_PYTHON


-- Build files have been written to: /home/teo/repos/kinematics-dynamics/bindings

when I try to run the example it says the same:

Traceback (most recent call last):
  File "exampleCartesianControlClient.py", line 4, in <module>
    import kinematics_dynamics
ImportError: No module named kinematics_dynamics

Answer 6 · 2018-02-27T12:38:42.000Z

I've noticed that when I compile kinematics-dynamics and the binding, it can't find ROBOTICSLAB_YARP_DEVICES

Perhaps you need to git pull and configure ROBOTICSLAB_YARP_DEVICES again, CMake should be able to locate its build/install dir automatically. Anyway, this is unrelated.

CMake Warning:
  Manually-specified variables were not used by the project:

    CREATE_PYTHON

You are building the kinematics-dynamics project alone, but its bindings are handled differently. Take a look at the updated install docs, you are missing a build/ subdirectory within bindings/. In the snippet above, you are building the kin-dyn project again (that is, CMake is reading from root /CMakeLists.txt again, instead of /bindings/CMakeLists.txt).

Answer 7 · 2018-02-27T12:53:57.000Z

Actually, there is no need to tweak env vars after you install bindings (at least for Python). To make sure, run:

python -c 'import kinematics_dynamics' && echo success || echo failure

Answer 8 · 2018-02-27T14:18:27.000Z

You are building the kinematics-dynamics project alone, but its bindings are handled differently. Take a look at the updated install docs, you are missing a build/ subdirectory within bindings/. In the snippet above, you are building the kin-dyn project again (that is, CMake is reading from root /CMakeLists.txt again, instead of /bindings/CMakeLists.txt).

Sorry @PeterBowman for the last snippet. You're right. I hadn't created a build directory 😖
This has been the process:

teo@teo-oliver:~/repos/kinematics-dynamics/bindings$ cd build/
teo@teo-oliver:~/repos/kinematics-dynamics/bindings/build$ cmake .. -DCREATE_PYTHON=ON
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found OpenCV: /usr/local/share/OpenCV/OpenCVConfig.cmake  
-- Found SWIG: /usr/bin/swig3.0 (found version "3.0.2") 
-- /usr/local/share/cmake-3.11/Modules/UseSWIG.cmake
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.4m.so (found version "3.4.3") 
CMake Deprecation Warning at /usr/local/share/cmake-3.11/Modules/UseSWIG.cmake:272 (message):
  SWIG_ADD_MODULE is deprecated.  Use SWIG_ADD_LIBRARY instead.
Call Stack (most recent call first):
  CMakeLists.txt:59 (swig_add_module)


-- Found PythonInterp: /usr/bin/python3.4 (found version "3.4.3") 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/teo/repos/kinematics-dynamics/bindings/build
teo@teo-oliver:~/repos/kinematics-dynamics/bindings/build$ make -j$(nproc)  # compile
Scanning dependencies of target gen_kinematics_dynamics_kinematics_dynamicsPYTHON_wrap
[ 33%] Swig source
[ 33%] Built target gen_kinematics_dynamics_kinematics_dynamicsPYTHON_wrap
Scanning dependencies of target _kinematics_dynamics
[ 66%] Building CXX object CMakeFiles/_kinematics_dynamics.dir/kinematics_dynamicsPYTHON_wrap.cxx.o
[100%] Linking CXX shared module _kinematics_dynamics.so
[100%] Built target _kinematics_dynamics
teo@teo-oliver:~/repos/kinematics-dynamics/bindings/build$ sudo make install; sudo ldconfig; cd # install and go home
[ 33%] Built target gen_kinematics_dynamics_kinematics_dynamicsPYTHON_wrap
[100%] Built target _kinematics_dynamics
Install the project...
-- Install configuration: ""
-- Installing: /usr/local/lib/python3/dist-packages/kinematics_dynamics.py
-- Installing: /usr/local/lib/python3/dist-packages/_kinematics_dynamics.so
teo@teo-oliver:~$ cd repos/kinematics-dynamics/examples/python/
teo@teo-oliver:~/repos/kinematics-dynamics/examples/python$ ls
exampleCartesianControlClient.py
teo@teo-oliver:~/repos/kinematics-dynamics/examples/python$ python exampleCartesianControlClient.py 
Traceback (most recent call last):
  File "exampleCartesianControlClient.py", line 4, in <module>
    import kinematics_dynamics
ImportError: No module named kinematics_dynamics

Answer 9 · 2018-02-27T14:29:12.000Z

Could you please type the output of
python --version
?

Answer 10 · 2018-02-27T14:42:26.000Z

-- Installing: /usr/local/lib/python3/dist-packages/kinematics_dynamics.py

Try this:

python3 exampleCartesianControlClient.py

Answer 11 · 2018-02-27T15:11:17.000Z

Could you please type the output of
python --version
?

Python 2.7.6

Try this:

python3 exampleCartesianControlClient.py

No more this error ^^. But I think this demo has been programed in order to use in python 2.

  File "exampleCartesianControlClient.py", line 9
    print '[error] Please try running yarp server'
                                                 ^
SyntaxError: Missing parentheses in call to 'print'

Anyway, I've fixed the parenthesis of the print function, but after that the example crashs showing this:

Traceback (most recent call last):
  File "exampleCartesianControlClient.py", line 3, in <module>
    import yarp
  File "/usr/local/lib/python2.7/dist-packages/yarp.py", line 28, in <module>
    _yarp = swig_import_helper()
  File "/usr/local/lib/python2.7/dist-packages/yarp.py", line 24, in swig_import_helper
    _mod = imp.load_module('_yarp', fp, pathname, description)
  File "/usr/lib/python3.4/imp.py", line 243, in load_module
    return load_dynamic(name, filename, file)
ImportError: dynamic module does not define init function (PyInit__yarp)

Answer 12 · 2018-02-27T15:16:08.000Z

Yes, with the current CMakes, YARP tends to install in the default (2.7), while kinematics-dynamics usually goes to the newest Python.

I'd recommend as indirectly commented here: in kinematics-dynamics bindings cmake, toggle to advanced via t and replace all 3.4 or 3.4m or similar manually to 2.7. Usually 3 of them.
Then compile, install, and go for python=python2.

Answer 13 · 2018-02-27T16:02:50.000Z

Ok. This are the fields modified using ccmake in toogle mode (only compiling binding of kinematic-dynamic):

 PYTHON_EXECUTABLE                /usr/bin/python2.7                                                 
 PYTHON_INCLUDE_DIR               /usr/include/python2.7                                             
 PYTHON_LIBRARY                   /usr/lib/x86_64-linux-gnu/libpython2.7.so

I've checked the existence of these file before writing the path, because there are python3.4m but not python2.7m . For example, in /usr/include I can see this:

teo@teo-oliver:/usr/include$ python
python                                         python3.4m/
python2                                        python3.4m-config
python2.7/                                     python3-config
python2.7-config                               python3m
python2-config                                 python3m-config
python3                                        python-argcomplete-check-easy-install-script3
python3.4/                                     python-config
python3.4-config

So, once I've configured and compiled it, I tried once again to run the example but it crashs with this error:

teo@teo-oliver:~/repos/kinematics-dynamics/examples/python$ python exampleCartesianControlClient.py 
error while opening /usr/local/lib/yarp/yarp_priority.so:
  /usr/local/lib/yarp/yarp_priority.so: undefined symbol: _ZTIN4yarp2os4impl27PortReaderBufferBaseCreatorE
yarp: Port /cartesianControlExample/rpc:c active at tcp://2.2.2.101:10042/
error while opening /usr/local/lib/yarp/yarp_priority.so:
  /usr/local/lib/yarp/yarp_priority.so: undefined symbol: _ZTIN4yarp2os4impl27PortReaderBufferBaseCreatorE
yarp: Port /cartesianControlExample/command:o active at tcp://2.2.2.101:10043/
error while opening /usr/local/lib/yarp/yarp_priority.so:
  /usr/local/lib/yarp/yarp_priority.so: undefined symbol: _ZTIN4yarp2os4impl27PortReaderBufferBaseCreatorE
yarp: Port /cartesianControlExample/state:i active at tcp://2.2.2.101:10044/
[error] DeviceDriverImpl.cpp:36 open(): Error on connect to remote RPC server.
yarpdev: ***ERROR*** driver <CartesianControlClient> was found but could not open
Cannot open the device!
Traceback (most recent call last):
  File "exampleCartesianControlClient.py", line 20, in <module>
    sys.exit()
NameError: name 'sys' is not defined

I have running at the same time BasicCartesianControl yarp device

Answer 14 · 2018-02-28T23:12:03.000Z

sys.exit() NameError: name 'sys' is not defined

Was minor, should be fixed at 127a768.

/usr/local/lib/yarp/yarp_priority.so: undefined symbol: _ZTIN4yarp2os4impl27PortReaderBufferBaseCreatorE

Looks like an issue of multiple installations of YARP. At minimum would require reinstalling YARP and k-d plus bindings, best if first removing all traces of installed versions.

However, a quick hack could maybe simply be: sudo rm /usr/local/share/yarp/plugins/priority.ini

Answer 15 · 2018-03-01T10:44:02.000Z

Thanks @jgvictores . These errors was fixed. Edited also the port name of RPC server (6e77c2a) to correspond with xml of teoBase

Answer 16 · 2018-03-01T11:40:21.000Z

Great, perfect!

Feel free to merge 6e77c2a [thanks!] from issue#147 into develop and close the issue!

Answer 17 · 2018-03-01T15:20:11.000Z

Maybe we've to do this example more functional.

teo@teo-oliver:~/repos/kinematics-dynamics/examples/python$ python exampleCartesianControlClient.py 
yarp: Port /cartesianControlExample/rpc:c active at tcp://2.2.2.101:10042/
yarp: Port /cartesianControlExample/command:o active at tcp://2.2.2.101:10043/
yarp: Port /cartesianControlExample/state:i active at tcp://2.2.2.101:10044/
yarp: Sending output from /cartesianControlExample/rpc:c to /teoSim/rightArm/CartesianControl/rpc:s using tcp
yarp: Sending output from /cartesianControlExample/command:o to /teoSim/rightArm/CartesianControl/command:i using udp
yarp: Receiving input from /teoSim/rightArm/CartesianControl/state:o to /cartesianControlExample/state:i using udp
[success] DeviceDriverImpl.cpp:60 open(): Connected to remote.
[INFO]created device <CartesianControlClient>. See C++ class roboticslab::CartesianControlClient for documentation.
> stat
[warning] ICartesianControlImpl.cpp:150 stat(): FK stream timeout, sending RPC request.
< ccnc [3.25149848408e-17, -0.34692, -0.221806, 2.40458836715e-16, 1.57079632679, -4.8091767343e-17]
> inv [3.25149848408e-17, -0.34692, -0.221806, 0, 1, 0, 90]
< [fail]
> movj [3.25149848408e-17, -0.34692, -0.221806, 0, 1, 0, 90]
< [fail]
delay(1)
bye!
yarp: Removing output from /cartesianControlExample/rpc:c to /teoSim/rightArm/CartesianControl/rpc:s
yarp: Removing output from /cartesianControlExample/command:o to /teoSim/rightArm/CartesianControl/command:i
yarp: Removing input from /teoSim/rightArm/CartesianControl/state:o to /cartesianControlExample/state:i

Answer 18 · 2018-03-01T16:19:43.000Z

I forgot to use the --transform trick here, sorry. Add this before line 16 (or obtain the equivalent scaled axis-angle representation):

options.put('transform', 1)

Answer 19 · 2018-03-05T11:07:21.000Z

with that change (160b2a9), the result is:

exampleCartesianControlClient.py:

yarp: Port /cartesianControlExample/rpc:c active at tcp://2.2.2.101:10037/
yarp: Port /cartesianControlExample/command:o active at tcp://2.2.2.101:10038/
yarp: Port /cartesianControlExample/state:i active at tcp://2.2.2.101:10039/
yarp: Sending output from /cartesianControlExample/rpc:c to /teoSim/rightArm/CartesianControl/rpc_transform:s using tcp
yarp: Sending output from /cartesianControlExample/command:o to /teoSim/rightArm/CartesianControl/command:i using udp
yarp: Receiving input from /teoSim/rightArm/CartesianControl/state:o to /cartesianControlExample/state:i using udp
[success] DeviceDriverImpl.cpp:60 open(): Connected to remote.
[INFO]created device <CartesianControlClient>. See C++ class roboticslab::CartesianControlClient for documentation.
> stat
[warning] ICartesianControlImpl.cpp:150 stat(): FK stream timeout, sending RPC request.
< ccnc [0.675174970134, -0.34692, 0.25095698028, 5.82132264516e-16, 1.0, 2.55418106437e-16, 19.9999571131]
> inv [0, -0.346927436108, -0.221801094416, 0, 1, 0, 90]
< [2880.19297392, -2160.00129458, 0.146176036394, -360.507285228, -2160.14618177, 5040.31430965]
> movj [0, -0.346927436108, -0.221801094416, 0, 1, 0, 90]
< [fail]
delay(1)
bye!
yarp: Removing output from /cartesianControlExample/rpc:c to /teoSim/rightArm/CartesianControl/rpc_transform:s
yarp: Removing output from /cartesianControlExample/command:o to /teoSim/rightArm/CartesianControl/command:i
yarp: Removing input from /teoSim/rightArm/CartesianControl/state:o to /cartesianControlExample/state:i

Cartesian Control Server:

yarp: Receiving input from /cartesianControlExample/rpc:c to /teoSim/rightArm/CartesianControl/rpc_transform:s using tcp
yarp: Receiving input from /cartesianControlExample/command:o to /teoSim/rightArm/CartesianControl/command:i using udp
yarp: Sending output from /teoSim/rightArm/CartesianControl/state:o to /cartesianControlExample/state:i using udp
[debug] RpcResponder.cpp:46 respond(): Got: [stat]
[debug] RpcResponder.cpp:46 respond(): Got: [inv] 0.0 -0.346927436108 -0.221801094416 0.0 1.0 0.0 90.0
[debug] RpcResponder.cpp:46 respond(): Got: [movj] 0.0 -0.346927436108 -0.221801094416 0.0 1.0 0.0 90.0
[info] ICartesianControlImpl.cpp:73 movj(): dist[0]: 386547053469.807068
[info] ICartesianControlImpl.cpp:77 movj():  -->candidate: 38654705346.980705
[info] ICartesianControlImpl.cpp:73 movj(): dist[1]: 2160.001295
[info] ICartesianControlImpl.cpp:73 movj(): dist[2]: 0.146176
[info] ICartesianControlImpl.cpp:73 movj(): dist[3]: 360.507285
[info] ICartesianControlImpl.cpp:73 movj(): dist[4]: 2160.146182
[info] ICartesianControlImpl.cpp:73 movj(): dist[5]: 5040.314310
[info] ICartesianControlImpl.cpp:80 movj(): max_time[final]: 38654705346.980705
[info] ICartesianControlImpl.cpp:94 movj(): vmo[0]: 10.000000
[info] ICartesianControlImpl.cpp:94 movj(): vmo[1]: 0.000000
[info] ICartesianControlImpl.cpp:94 movj(): vmo[2]: 0.000000
[info] ICartesianControlImpl.cpp:94 movj(): vmo[3]: 0.000000
[info] ICartesianControlImpl.cpp:94 movj(): vmo[4]: 0.000000
[info] ICartesianControlImpl.cpp:94 movj(): vmo[5]: 0.000000
[error] ICartesianControlImpl.cpp:100 movj(): getRefSpeeds (for storing) failed.
[INFO]device active in background...
yarp: Removing input from /cartesianControlExample/rpc:c to /teoSim/rightArm/CartesianControl/rpc_transform:s
yarp: Removing input from /cartesianControlExample/command:o to /teoSim/rightArm/CartesianControl/command:i
yarp: Removing output from /teoSim/rightArm/CartesianControl/state:o to /cartesianControlExample/state:i

and no movement of the robot

Answer 20 · 2018-03-05T11:33:54.000Z

Have you pulled, compiled and installed latest openrave-yarp-plugins? What's the terminal output in the simulator?

Answer 21 · 2018-03-05T13:56:19.000Z

Mmm the lines above do not look good at all...

< ccnc [0.675174970134, -0.34692, 0.25095698028, 5.82132264516e-16, 1.0, 2.55418106437e-16, 19.9999571131]
> inv [0, -0.346927436108, -0.221801094416, 0, 1, 0, 90]
< [2880.19297392, -2160.00129458, 0.146176036394, -360.507285228, -2160.14618177, 5040.31430965]
> movj [0, -0.346927436108, -0.221801094416, 0, 1, 0, 90]
< [fail]

Where 2880.19297392 looks way out of limits, and [fail] says that performing no movement makes sense.

Answer 22 · 2018-03-05T14:03:21.000Z

And...

[warning] ICartesianControlImpl.cpp:150 stat(): FK stream timeout, sending RPC request.

Note to self: review this, shouldn't time out on the first try.

Answer 23 · 2018-03-05T14:11:30.000Z

Ok. I've pulled openrave-yarp-plugins and I've changed the values in the example (837970f)
The elbow is positioned 90 degrees and the TCP is turned 20 degrees around the X axis.
Now is working perfectly! You can do PR (#149) if you are agree.

Answer 24 · 2018-03-05T22:42:16.000Z

Where 2880.19297392 looks way out of limits (...)

@jgvictores, @rsantos88 same happened to me on my local, outdated installation of teo-openrave-models. That is, the controlboard opened by teoSim reported weird joint limits, which later propagated to the controller/solver pair (#145 FTW!). Please git pull TEO's OR environment files, install them and try again, should be fine.

For the record, roboticslab-uc3m/teo-openrave-models@65b7ee6 works, roboticslab-uc3m/teo-openrave-models@767ba9a doesn't.

Answer 25 · 2018-03-06T13:57:36.000Z

Note to self: review this, shouldn't time out on the first try.

Solved at 04fd34f.

Answer 26 · 2018-03-06T14:53:53.000Z

@rsantos88 Ok to close this issue!