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Commandline usage

Training

Use train to run training (deepclrun in v5.8.3 and below).

  • Syntax is based on that specified in Ciresan et al's Multi-column Deep Neural Networks for Image Classification, section 3, first paragraph:
    • network is defined by a string like: 100C5-MP2-100C5-MP2-100C4-MP2-300N-100N-6N
    • 100c5 means: a convolutional layer, with 100 filters, each 5x5
    • adding z to a convolutional layer makes it zero-padded, eg 8c5z is: a convolutional layer, with 8 filters, each 5x5, zero-padded
    • mp2 means a max-pooling layer, over non-overlapping regions of 2x2
    • 300n means a fully connected layer with 300 hidden units
    • relu means a relu layer
    • tanh means a tanh layer
  • Thus, you can do, for example:
./train netdef=8c5z-relu-mp2-16c5z-relu-mp3-150n-tanh-10n learningrate=0.002 dataset=mnist

... in order to learn mnist, using the same neural net architecture as used in the convnetjs mnist demo

  • Similarly, you can learn NORB, using approximately the architecture specified in lecun-04, by doing:
./train netdef=8c5-relu-mp4-24c6-relu-mp3-80c6-relu-5n learningrate=0.0001 dataset=norb
./train netdef=MP3-300C6-RELU-MP2-500C4-RELU-MP4-500N-TANH-5N learningrate=0.0001 dataset=norb

Convolutional

  • eg -32c5 is a convolutional layer with 32 filters of 5x5
  • -32c5z is a convolutional layer with zero-padding, of 32 filters of 5x5

Fully-connected

  • eg -150n is a fully connected layer, with 150 neurons.

Max-pooling

  • Eg -mp3 will add a max-pooling layer, over 3x3 non-overlapping regions. The number is the size of the regions, and can be modified

Dropout layers

  • Simply add -drop into the netdef string
    • this will use a dropout ratio of 0.5

Activation layers

  • Simply add any of the following into the netdef string:
    • -tanh
    • -sigmoid
    • -relu
    • -elu

Random patches

  • RP24 means a random patch layer, which will cut a 24x24 patch from a random position in each incoming image, and send that to its output
  • during testing, the patch will be cut from the centre of each image

Random translations

  • RT2 means a random translations layer, which will translate the image randomly during training, up to 2 pixels, in either direction, along both axes
  • Can specify any non-negative integer, less than the image size
  • During testing, no translation is done

Multi-column deep neural network "MultiNet"

  • You can train several neural networks at the same time, and predict using the average output across all of them using the multinet option
  • Simply add eg multinet=3 in the commandline, to train across 3 nets in parallel, or put a number of your choice

Repeated layers

  • simply prefix a layer with eg 3* to repeat it. 3* will repeat the layer 3 times, and similar for other numbers, eg:
./train netdef=6*(32c5z-relu)-500n-361n learningrate=0.0001 dataset=kgsgoall

... will create 6 convolutional layers of 32 5x5 filters each.

  • you can also use parentheses (...) to repeat multiple layers, eg:
./train netdef=3*(32c5z-relu-mp2)-150n-10n

... will be expanded to:

./train netdef=32c5z-relu-mp2-32c5z-relu-mp2-32c5z-relu-mp2-150n-10n

File types

  • Simply pass in the filename of the data file with the images in
  • Filetype will be detected automatically
  • See Loaders for information on available loaders

Weight persistence

  • By default, weights will be written to weights.dat, after each epoch
    • You can add option writeweightsinterval=5 to write weights every 5 minutes, even if the epoch hasnt finished yet. Just replace 5 with the number of minutes between each write
  • If you specify option loadweights=1, the weights will be loadeded at the start
  • You can change the weights filepath with option eg weightsfile=somefilename.dat
  • If you specify option loadweights=1, the netdef will be compared to that used to generate the current weights file: if it is different, then DeepCL will ask you if you're sure you want to continue, to avoid corrupting the weights file
  • Epoch number, batch number, batch loss, and batch numcorrect will all be loaded from where they left off, from the weights file, so you can freely stop and start training, without losing the training
    • be sure to use the writeweightsinterval=5 option if you are going to stop/start often, with long epochs, to avoid losing hours/days of training!

Command-line options

Option Description
gpuindex=1 choose which gpu device to use. Default -1 means first gpu, or else cpu. Otherwise, gpu index from 0
dataset=norb sets datadir, trainfile and validatefile according to one of several dataset profiles. Current choices: mnist, norb, cifar10, kgsgo, kgsgoall
datadir=../data/mnist path to data files
trainfile=train-dat.mat name of training data file, the one with the images in. Note that the labels file will be determined automatically, based on the data filename and type, eg in this case train-cat.mat
validationfile=validate-dat.mat name of the validation data file, the one with the images in. Note that the labels file will be determined automatically, based on the data filename and type, eg in this case validate-cat.mat
numtrain=1000 only uses the first 1000 training samples
numtest=1000 only uses the first 1000 testing samples
netdef=100c5-10n provide the network definition, as documented in Commandline usage above
weightsinitializer=uniform choose weight initializer. valid choices: original, uniform (default: original)
initialweights=10 set size of initial weights, sampled uniformally from range +/- initialweights divided by fanin. used by uniform initializer (default: 1.0)
trainer=sgd choose trainer. valid choices are sgd, anneal, nesterov, adagrad, or rmsprop. (default: sgd)
learningrate=0.0001 specify learning rate. works with any trainer, except adadelta
momentum=0.1 specify momentum (default: 0). works with sgd and nesterov trainers
rho=0.9 rho decay, from equation 1 of adadelta paper, http://arxiv.org/pdf/1212.5701v1.pdf (default: 0.9)
weightdecay=0.001 weight decay, 0 means no decay, 1 means complete decay (default:0). works with sgd trainer
anneal=0.95 anneal learning. 1 means no annealing. 0 means learningrate is 0 (default:1). works with anneal trainer
numepochs=20 train for this many epochs
batchsize=128 size of each mini-batch. Too big, and the learning rate will need to be reduced. Too small, and performance will decrease. 128 might be a reasonable compromise
normalization=maxmin can choose maxmin or stddev. Default is stddev
normalizationnumstds=2 how many standard deviations from mean should be +1/-1? Default is 2
normalizationexamples=50000 how many examples to read, to determine normalization values
multinet=3 train 3 networks at the same time, and predict using average output from all 3, can put any integer greater than 1
loadondemand=1 Load the file in chunks, as learning proceeds, to reduce memory requirements. Default 0
filebatchsize=50 When loadondemand=1, load this many batches at a time. Numbers larger than 1 increase efficiency of disk reads, speeding up learning, but use up more memory
weightsfile=weights.dat file to store weights in, after each epoch. If blank, then weights not stored
writeweightsinterval=5 write the weights to file every 5 minutes of training, even if epoch hasnt finished yet. Default is 0, ie only write weights after each epoch
loadweights=1 load weights at start, from weightsfile. Current training config, ie netdef and trainingfile, should match that used to create the weightsfile. Note that epoch number will continue from file, so make sure to increase numepochs sufficiently

Prediction

Use predict to run prediction (deepclexec` in v5.8.3 and below)