nnplot

📺 A Python library for pruning and visualizing Keras Neural Networks' structure and weights.

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nnplot is a Python library for visualizing Neural Networks in an informative representation.

It has the ability to display the NN's structure, dominance of links weights per layer and their polarity (positive/negative).

It also provides functions for pruning the NN in order to display the n “most important” nodes of each layer.

It's simple:

Install:

pip install nnplot graphviz

And in your code:

from nnplot.functions import plot_net

plot_net(trained_model)

and your network will be plotted!

See more:

• How to install it?

• How to use it?

How to install it?

nnplot is available via pip:

pip install nnplot graphviz

*alternatively, you can download the nnplot subfolder and place it in the same directory of your code.

How to use it?

once you have a built and trained Keras model, you can simply:

plot the model:

from nnplot.functions import plot_net

plot_net(trained_model)

or prune the model:

from nnplot.functions import prune

[new_model, new_input_list] = prune(model, max_limit=5)

To make the most out of the functions mentioned above, try using their optional flags (examples follow):

plot:

from nnplot.functions import plot_net

plot_net(model,
         input_list    = ['1: Input A', '2: Input B', '3: Input C','etc..'],
         view=True,
         filename      = "my_network.gv",
         plot_title    = "My Neural Network Title",
         out_title     = "This is my output title: \n 1. output A \n 2. output B",
         color_edges   = "rb",
         print_weights = False,
         size_limit    = 10)

Arguments:

model: A Keras model instance.

view: whether to plot the model on screen after its generation.

filename: path and name to save the visualization outcome, as a PDF and a .gv (graph-viz) file.

title: A title for the graph.

color_edges: whether to visualize the weights of the edges as colors.

options:

• "rb" - Red / Black: red for positive edges and black for negative ones.
• "mc" - Multi Colored: all edges that converge into the same node, have the same (unique) color.
• "none" - all edges painted black (but thickness visualization remains).

print_weights: whether to print the weights of the edges to the screen.

size_limit: max number of nodes in each layer (simply the first n nodes, use prune for a more complex node selection).

prune:

from nnplot.functions import prune

[new_network, new_input_list] = prune(model,
                                      max_limit,
                                      input_list = ['1: Input A', '2: Input B','etc..'],
                                      verbose    = True)
				

Arguments:

model: A Keras model instance.

max_limit: maximal number of nodes on each layer. (How are the nodes picked in this prune?)

input_list: list of input names, so that the new input_indexes output will have their original names.

verbose: print information of the process along the way.

Outputs:

network: the new pruned network.

input_indexs: the indexes of the chosen inputs