Haven't found the definition of "injectnoise()"

[C-Harlin]

Hi, I'm new to Julia and I noticed that injectnoise() was used without exactly defined.
All I found throughout the codes with the "injectnoise" are only two lines:L311,L325

t2vec/preprocessing/SpatialRegionTools.jl

Lines 309 to 325 in d09f17c

	function createTrainVal(region::SpatialRegion,
	trjfile::String,
	injectnoise::Function,
	ntrain::Int,
	nval::Int;
	nsplit=5,
	min_length=20,
	max_length=100)
	seq2str(seq) = join(map(string, seq), " ") * "\n"
	h5open(trjfile, "r") do f
	trainsrc, traintrg = open("../data/train.src", "w"), open("../data/train.trg", "w")
	validsrc, validtrg = open("../data/val.src", "w"), open("../data/val.trg", "w")
	for i = 1:ntrain+nval
	trip = f["/trips/$i"] |> read
	min_length <= size(trip, 2) <= max_length || continue
	trg = trip2seq(region, trip) |> seq2str
	noisetrips = injectnoise(trip, nsplit)

The code works, so I must have some misunderstanding there.
Could anyone tell me where I am wrong?

[boathit]

injectnoise is an argument of createTrainVal, i.e., it is a variable and can be any function you pass to createTrainVal. For example, the call createTrainVal(region, "porto.h5", downsampling, 50, 10) instantiates injectnoise to be downsampling which is defined here.

[C-Harlin]

Thanks for your quick reply! I just realized what a simply question I asked. Thx!