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TROUBLESHOOTING.md

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Troubleshooting

This page contains a small collections of issues/errors that may be experienced along with their fixes.

FIRST OF ALL: did you read the main README page? did you use the provided INSTALL SCRIPTS? If not then go back on the README page, read the few lines in the install section and launch the REQUIRED install script. The install scripts were created in order to perform all the required install operations for you and make the install process itself as painless as possible.

Bad tracking performances

Due to the multi-threading system (tracking thread + local mapping thread) and the non-super-fast performances of the python implementations, bad tracking performances may occur and vary depending on your machine computation capabilities. In a few words, it may happen that the local mapping thread is not fast enough to spawn new map points in time for the tracking thread. In fact, new spawned map points are necessary to let the tracking thread find enough {keypoint}-{map point} correspondences, and hence stably grasp at the map and proceed along its estimated trajectory. Simply put, the local mapping thread continuously builds/unrolls the fundamental 'carpet' of points (the map) on which the tracking thread 'walks': no 'carpet', no party!

If you experience bad tracking performances, go in parameters.py and:

  1. first, try to increase/adjust the parameter kTrackingWaitForLocalMappingSleepTime

  2. then, if you don't actually see any satisfying improvement with step (1), set kTrackingWaitForLocalMappingToGetIdle=True

SIFT or SURF error

This is already explained in the main README file.

In order to use non-free OpenCV modules (i.e. SIFT and SURF), you need opencv-contrib-python. This package can be installed by running

$ pip3 install opencv-contrib-python==3.4.0.12

$ pip3 uninstall opencv-contrib-python
$ pip3 install opencv-contrib-python==3.4.2.16

For a more advanced OpenCV installation procedure, you can take a look here.

How to check your installed OpenCV version:

$ python3 -c "import cv2; print(cv2.__version__)"

g2o Error

If you run into the following error

 File ".../pyslam/optimizer_g2o.py", line 96, in optimization
    edge.fx = f.fx 
AttributeError: 'g2o.EdgeSE3ProjectXYZ' object has no attribute 'fx'

that's because you did not run the script

$ ./install_thirdparty.sh

as explained in the main README file. That's required in order to properly build and install the required thirdparty libs.

Cannot properly import g2o library or other libs

If you get an error message like

import g2o 
ModuleNotFoundError: No module named 'g2o' error

First of all, check if you have a compiled thirdparty/g2opy/lib/g2o.cpython-*-linux-gnu.so. If not, Did you use one of the install_all scripts? Depending on your selected working environment (native, conda, python3-venv), you need to launch its companion install_all script in order to actually install all the required libraries (including g2o). Please, read the install instruction in the main README file.

On the other hand, if you already have a compiled thirdparty/g2opy/lib/g2o.cpython-*-linux-gnu.so, it's very likely you have libraries compiled in a 'mixed' way. Then, try to clean everything with the script clean.sh, and follow the installation procedure again (see the main README file).

Problems with ROS and OpenCV

If you have ROS installed in your system and got the following error:

ImportError: /opt/ros/kinetic/lib/python2.7/dist-packages/cv2.so:  
undefined symbol: PyCObject_Type

you can run the following command in your shell:

$ export PYTHONPATH=""

this will remove the ROS OpenCV python modules from your python path and will solve the issue.

Could not import PILLOW_VERSION from PIL

Or ImportError: cannot import name 'PILLOW_VERSION'

If you get this error, it is very likely that pillow 7.0.0 has some troubles with pytorch. In order to solve this error, run

$ pip3 uninstall pillow 
$ pip3 install pillow==6.2.2

(fix from this page)

ValueError: ndarray is not C-contiguous

If the following error pops-up:

ValueError: ndarray is not C-contiguous

Open pyslam/search_points.py, find this line (should be line 79):

projs = f_cur.project_map_points(points)

and replace it with :

projs = f_cur.project_map_points(points)
projs = projs.copy(order='C')

(thanks to naughtyStark)

Error: python3: malloc.c:2401: sysmalloc: Assertion `(old_top == initial_top (av) && old_size == 0) ...

I got this error after messing up with the installation of different python packages related to torch and torchvision. The result was that tfeat was generating segmentation faults. In order to check if this is actually your case, run

$ cd test/cv     # this is compulsory
$ python3 test_tfeat.py

and check if you get a segmenation fault. If this is the case, try to run

$ pip3 uninstall torch torchvision 
$ pip3 install torch torchvision

in order to get a clean installation of the torch packages.

Python version

Installation issues may happen if multiple python versions are mixed. All the instructions reported in this repository assume you are using python3. If you really want to install things manually instead of using the install scripts, follow the same steps of the install scripts and be sure to use pip3 instead of pip, and good luck!