I don’t know what to make of this… In the follow snippet const user_mappings, profile_mappings = Dict{Int,Int}(), Dict{Int,Int}() const user_counter, profile_counter = 0, 0 function data_accessor() :: DataAccessor training_data = CSV.read(training_file) for row in eachrow(training_data) …

This due to the scoping of functions, see https://docs.julialang.org/en/stable/manual/variables-and-scoping/#Hard-Local-Scope-1 . The first example shows this. Also note that x += 1 is equivalent to writing x = x+1.

Variable scope in functions

General Usage

mauro3 December 20, 2017, 1:51pm 3

I think you need a global user_counter inside your function.

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Variable scope in functions

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