how to create virtual environment without conda?

python -m pip install --user virtualenv

cd to install location path of env

python -m virtualenv env 

source env/bin/activate

libgflags.a(gflags.cc.o): relocation R_X86_64_32S make pycaffe

gflags is not compiled as a shared library by default; make sure it is compiled as a shared library:

cd gflags/build
cmake .. -DBUILD_SHARED_LIBS=ON
make -j32
sudo make -j32 install

After that glog compiles fine against gflags.

how to know the full path of a process / process pid?

pwdx pid

e.g.:-

pwdx 30580

how to create a ssh shortcut

cd ~/.ssh

vim config

Host 123
    HostName 192.168.1.123
    User ninja

/usr/lib/libprotobuf.a: error adding symbols: Bad value

How to calculate fps from elapsed time?

p/s: copy from https://stackoverflow.com/questions/43761004/fps-how-to-divide-count-by-time-function-to-determine-fps

• Here is a very simple way to print your program's frame rate at each frame (no counter needed) :
  

  import time
  
  while True:
      start_time = time.time() # start time of the loop
  
      ########################
      # your fancy code here #
      ########################
  
      print("FPS: ", 1.0 / (time.time() - start_time)) # FPS = 1 / time to process loop

• If you want the average frame rate over x seconds, you can do like so (counter needed) :
  

  import time
  
  start_time = time.time()
  x = 1 # displays the frame rate every 1 second
  counter = 0
  while True:
  
      ########################
      # your fancy code here #
      ########################
  
      counter+=1
      if (time.time() - start_time) > x :
          print("FPS: ", counter / (time.time() - start_time))
          counter = 0
          start_time = time.time()

Hope it helps!

cannot find -lboost_python3

cd /usr/lib/x86_64-linux-gpu

sudo ln -s libboost_python-py35.so libboost_python3.so