tests/testthat/test_shapes.R

In neuroimaginador/dl4ni: Deep Learning Flows for Neuroimaging

context("shapes")

expect_works <- function(object) testthat::expect_error(object, NA)

test_that("shapes works as expected", {

  # We'll use a modified BET (non-convolutional) demo
  load_keras()
  
  # Get the dataset
  problem <- "brain_extraction"
  problem_path <- problem %>% get_dataset()
  info <- problem_path %>% get_problem_info(num_subjects = 5, interactive = FALSE)
  
  info %>% split_train_test_sets()
  
  # Model scheme
  scheme <- DLscheme$new()
  
  scheme$add(width = 7,
             only_convolutionals = FALSE,
             output_width = 3,
             num_features = 3,
             vol_layers_pattern = list( 
               dense(25)),
             vol_dropout = 0.15,
             feature_layers = list(dense(10)),
             feature_dropout = 0.15,
             common_layers = list(
               dense(20)),
             common_dropout = 0.25,
             last_hidden_layers = list(dense(10)),
             optimizer = "adadelta",
             scale = "z",
             scale_y = "none")
  
  scheme$add(memory_limit = "2G")
  
  # Network instatiation
  expect_works(bet_model <- scheme$instantiate(problem_info = info))
  
  expect_works(shapes <- bet_model$get_model() %>% model_shapes())
  expect_works(units <- bet_model$get_model() %>% model_units())

})