other.md

Introduction

This page will introduce other setting in cxxnet, including:

• Device Selection
• Printing Control
• Training Round
• Saving Model and Continue Training

Set working hardware

• To use CPU, set the field

dev = cpu

• To use GPU, set the field

dev = gpu

We can also set specific device (say device 1) by using

dev = gpu:1

• To use multi-GPU, set the field with the corresponding device id

dev = gpu:0,1,2,3

or

dev = gpu:0-3

In default, it is dev=gpu

Print information

• To print training error evaluation, just set this field to 1

eval_train = 1

• in default this field is 0, which means cxxnet won't print anything about training error.
• To turn off all information while training, set this field to 1

silent = 1

• In default this field is 0
• To control print frequent, change this field

print_step = 100

• In default it will print every 100 batch

Set round of training

There are two field handle training round together: num_round and max_round

• num_round is used for number of round to train
• max_round is used for maximum number of round to train from now on

num_round = 15
max_round = 15

This configuration will make cxxnet train for 15 rounds on the training data.

More examples,

num_round = 50
max_round = 2

If we have a model trained 40 rounds, then use this configuration continue to train, cxxnet will stop at the 42 round.

Saving model and continue training

• To save model while training round, set this field to saving frequent(a number)

save_model = 2
model_dir = path_of_dir_to_save_model

• In default, this field is 1, means cxxnet will save a model in every round
• To continue a training process, you need to set model_in as the input snapshot you want to continue from

model_in = path of model file

• Alternatively, if you save model every round (save_model=1), then you can use option continue, cxxnet will automatically search the latest model and start from that model

continue = 1

In default, if neither of the two values is set, cxxnet will start training from start.