tf_cnnvis

A blog post describing the library: https://medium.com/@falaktheoptimist/want-to-look-inside-your-cnn-we-have-just-the-right-tool-for-you-ad1e25b30d90

tf_cnnvis is a CNN visualization library which you can use to better understand your own CNNs. We use the TensorFlow library at the backend and the generated images are displayed in TensorBoard. We have implemented 2 CNN visualization techniques so far:

1) Based on the paper Visualizing and Understanding Convolutional Networks by Matthew D. Zeiler and Rob Fergus. The goal here is to reconstruct the input image from the information contained in any given layers of the convolutional neural network. Here are a few examples

Figure 1: Original image and the reconstructed versions from maxpool layer 1,2 and 3 of Alexnet generated using tf_cnnvis.

2) CNN visualization based on Deep dream by Google. Here's the relevant blog post explaining the technique. In essence, it attempts to construct an input image that maximizes the activation for a given output. We present some samples below:

Carbonara	Ibex	Elephant	Ostrich
Cheese burger	Tennis ball	Fountain pen	Clock tower
Cauliflower	Baby Milk bottle	Sea lion	Dolphin

Requirements:

• Tensorflow (>= 1.8)
• numpy
• scipy
• h5py
• wget
• Pillow
• six
• scikit-image

If you are using pip you can install these with

pip install tensorflow numpy scipy h5py wget Pillow six scikit-image

Setup script

Clone the repository

#!bash

git clone https://github.com/InFoCusp/tf_cnnvis.git

And run

#!bash
sudo pip install setuptools
sudo pip install six
sudo python setup.py install
sudo python setup.py clean

Citation

If you use this library in your work, please cite

  @misc{tf_cnnvis,
    author = {Bhagyesh Vikani, Falak Shah},
    title = {CNN Visualization},
    year = {2017},
    howpublished = {\url{https://github.com/InFoCusp/tf_cnnvis/}},
    doi = {10.5281/zenodo.2594491}
  }

API

tf_cnnvis.activation_visualization(graph_or_path, value_feed_dict, input_tensor=None, layers='r', path_logdir='./Log', path_outdir='./Output')

The function to generate the activation visualizations of the input image at the given layer.

Parameters

• graph_or_path (tf.Graph object or String) – TF graph or [Path-to-saved-graph] as String containing the CNN.

• value_feed_dict (dict) – Values of placeholders to feed while evaluating the graph

  • dict : {placeholder1 : value1, ...}

• input_tensor (tf.tensor object (Default = None)) – tf.tensor (input tensor to the model - where images enter into the models) Note: This is not a standalone tensor/placeholder separate from the model

• layers (list or String (Default = 'r')) –

  • layerName : Reconstruction from a layer specified by name
  • ‘r’ : Reconstruction from all the relu layers
  • ‘p’ : Reconstruction from all the pooling layers
  • ‘c’ : Reconstruction from all the convolutional layers

• path_outdir (String (Default = "./Output")) – [path-to-dir] to save results into disk as images

• path_logdir (String (Default = "./Log")) – [path-to-log-dir] to make log file for TensorBoard visualization

Returns

• is_success (boolean) – True if the function ran successfully. False otherwise

tf_cnnvis.deconv_visualization(graph_or_path, value_feed_dict, input_tensor=None, layers='r', path_logdir='./Log', path_outdir='./Output')

The function to generate the visualizations of the input image reconstructed from the feature maps of a given layer.

Parameters

• graph_or_path (tf.Graph object or String) – TF graph or [Path-to-saved-graph] as String containing the CNN.

• value_feed_dict (dict) – Values of placeholders to feed while evaluating the graph

  • dict : {placeholder1 : value1, ...}

• input_tensor (tf.tensor object (Default = None)) – tf.tensor (input tensor to the model - where images enter into the models) Note: This is not a standalone tensor/placeholder separate from the model

• layers (list or String (Default = 'r')) –

  • layerName : Reconstruction from a layer specified by name
  • ‘r’ : Reconstruction from all the relu layers
  • ‘p’ : Reconstruction from all the pooling layers
  • ‘c’ : Reconstruction from all the convolutional layers

• path_outdir (String (Default = "./Output")) – [path-to-dir] to save results into disk as images

• path_logdir (String (Default = "./Log")) – [path-to-log-dir] to make log file for TensorBoard visualization

Returns

• is_success (boolean) – True if the function ran successfully. False otherwise

tf_cnnvis.deepdream_visualization(graph_or_path, value_feed_dict, layer, classes, input_tensor=None, path_logdir='./Log', path_outdir='./Output')

The function to generate the visualizations of the input image reconstructed from the feature maps of a given layer.

Parameters

• graph_or_path (tf.Graph object or String) – TF graph or [Path-to-saved-graph] as String containing the CNN.

• value_feed_dict (dict) – Values of placeholders to feed while evaluating the graph

  • dict : {placeholder1 : value1, ...}

• layer (String) - name of a layer in TF graph

• classes (List) - list featuremap index for the class classification layer

• input_tensor (tf.tensor object (Default = None)) – tf.tensor (input tensor to the model - where images enter into the models) Note: This is not a standalone tensor/placeholder separate from the model

• path_outdir (String (Default = "./Output")) – [path-to-dir] to save results into disk as images

• path_logdir (String (Default = "./Log")) – [path-to-log-dir] to make log file for TensorBoard visualization

Returns

• is_success (boolean) – True if the function ran successfully. False otherwise

To visualize in TensorBoard

To start Tensorflow, run the following command on the console

#!bash

tensorboard --logdir=./Log

and on the TensorBoard homepage look under the Images tab

Additional helper functions

tf_cnnvis.utils.image_normalization(image, ubound=255.0, epsilon=1e-07)

Performs Min-Max image normalization. Transforms the pixel intensity values to range [0, ubound]

Parameters

• image (3-D numpy array) – A numpy array to normalize
• ubound (float (Default = 255.0)) – upperbound for a image pixel value

Returns

• norm_image (3-D numpy array) – The normalized image

tf_cnnvis.utils.convert_into_grid(Xs, padding=1, ubound=255.0)

Convert 4-D numpy array into a grid of images for display

Parameters

• Xs (4-D numpy array (first axis contations an image)) – The 4D array of images to put onto grid
• padding (int (Default = 1)) – Spacing between grid cells
• ubound (float (Default = 255.0)) – upperbound for a image pixel value

Returns

• (3-D numpy array) – A grid of input images