Python Bindings (WIP)

Build Instructions

After cloning OpenPV:

cd OpenPV; git checkout pybind; git submodule update

Now create a build folder and run ccmake as usual. Press T to open the advanced configuration and set the following options:

PV_BUILD_SHARED: ON

CUDA_NVCC_FLAGS: -Xcompiler -fPIC

CUDA_USE_STATIC_CUDA_RUNTIME: OFF

Run make and ensure PetaVision builds with no errors. Now go back into ccmake and enable:

PV_BUILD_PYTHON: ON

Run make one more time and there should now be a file with a name like PythonBindings.cpython-x.so. Make a symlink to this file inside OpenPV/python/OpenPV:

cd OpenPV/python/OpenPV; ln path-to-PythonBindings-file .

Now you can use the bindings by adding this to the top of your Python script:

import sys

sys.path.append('path-to-OpenPV/python')

import OpenPV

Using the library

Classes

PetaVision

PetaVision(args_dict, params_string)

begin()

advance(num_steps)

finish()

get_connection_weights(conn_name)

set_connection_weights(conn_name, np_float_array)

get_layer_activity(layer_name)

get_layer_state(layer_name)

set_layer_state(layer_name, np_float_array)

is_finished()

get_probe_values(probe_name)

is_root()

wait_for_commands()

Runner

See cifar_example.py for how to use.