% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/generator_folder_collect.R
\name{generator_initialize}
\alias{generator_initialize}
\title{Initializes generators defined by \code{generator_fasta_label_folder} function}
\usage{
generator_initialize(
  directories,
  format = "fasta",
  batch_size = 256,
  maxlen = 250,
  max_iter = 10000,
  vocabulary = c("a", "c", "g", "t"),
  verbose = FALSE,
  shuffle_file_order = FALSE,
  step = 1,
  seed = 1234,
  shuffle_input = FALSE,
  file_limit = NULL,
  path_file_log = NULL,
  reverse_complement = FALSE,
  reverse_complement_encoding = FALSE,
  val = FALSE,
  ambiguous_nuc = "zero",
  proportion_per_seq = NULL,
  target_middle = FALSE,
  read_data = FALSE,
  use_quality_score = FALSE,
  padding = TRUE,
  added_label_path = NULL,
  add_input_as_seq = NULL,
  skip_amb_nuc = NULL,
  max_samples = NULL,
  file_filter = NULL,
  concat_seq = NULL,
  use_coverage = NULL,
  set_learning = NULL,
  proportion_entries = NULL,
  sample_by_file_size = FALSE,
  n_gram = NULL,
  n_gram_stride = 1,
  add_noise = NULL,
  return_int = FALSE,
  reshape_xy = NULL
)
}
\arguments{
\item{directories}{Vector of paths to folder containing fasta files. Files in one folder should belong to one class.}

\item{format}{File format, either \code{"fasta"} or \code{"fastq"}.}

\item{batch_size}{Number of samples in one batch.}

\item{maxlen}{Length of predictor sequence.}

\item{max_iter}{Stop after \code{max_iter} number of iterations failed to produce a new batch.}

\item{vocabulary}{Vector of allowed characters. Characters outside vocabulary get encoded as specified in \code{ambiguous_nuc}.}

\item{verbose}{Whether to show messages.}

\item{shuffle_file_order}{Logical, whether to go through files randomly or sequentially.}

\item{step}{How often to take a sample.}

\item{seed}{Sets seed for \code{set.seed} function for reproducible results.}

\item{shuffle_input}{Whether to shuffle entries in every fasta/fastq file before extracting samples.}

\item{file_limit}{Integer or \code{NULL}. If integer, use only specified number of randomly sampled files for training. Ignored if greater than number of files in \code{path}.}

\item{path_file_log}{Write name of files to csv file if path is specified.}

\item{reverse_complement}{Boolean, for every new file decide randomly to use original data or its reverse complement.}

\item{reverse_complement_encoding}{Whether to use both original sequence and reverse complement as two input sequences.}

\item{val}{Logical, call initialized generator "genY" or "genValY" where Y is an integer between 1 and length of directories.}

\item{ambiguous_nuc}{How to handle nucleotides outside vocabulary, either \code{"zero"}, \code{"discard"}, \code{"empirical"} or \code{"equal"}.
\itemize{
\item If \code{"zero"}, input gets encoded as zero vector.
\item If \code{"equal"}, input is repetition of \code{1/length(vocabulary)}.
\item If \code{"discard"}, samples containing nucleotides outside vocabulary get discarded.
\item If \code{"empirical"}, use nucleotide distribution of current file.
}}

\item{proportion_per_seq}{Numerical value between 0 and 1. Proportion of sequence to take samples from (use random subsequence).}

\item{target_middle}{Split input sequence into two sequences while removing nucleotide in middle. If input is x_1,..., x_(n+1), input gets split into
input_1 = x_1,..., x_m and input_2 = x_(n+1),..., x_(m+2) where m = ceiling((n+1)/2) and n = maxlen. Note that x_(m+1) is not used.}

\item{read_data}{If true the first element of output is a list of length 2, each containing one part of paired read.}

\item{use_quality_score}{Whether to use fastq quality scores. If TRUE input is not one-hot-encoding but corresponds to probabilities.
For example (0.97, 0.01, 0.01, 0.01) instead of (1, 0, 0, 0).}

\item{padding}{Whether to pad sequences too short for one sample with zeros.}

\item{added_label_path}{Path to file with additional input labels. Should be a csv file with one column named "file". Other columns should correspond to labels.}

\item{add_input_as_seq}{Boolean vector specifying for each entry in \code{added_label_path} if rows from csv should be encoded as a sequence or used directly.
If a row in your csv file is a sequence this should be \code{TRUE}. For example you may want to add another sequence, say ACCGT. Then this would correspond to 1,2,2,3,4 in
csv file (if vocabulary = c("A", "C", "G", "T")).  If \code{add_input_as_seq} is \code{TRUE}, 12234 gets one-hot encoded, so added input is a 3D tensor.  If \code{add_input_as_seq} is
\code{FALSE} this will feed network just raw data (a 2D tensor).}

\item{skip_amb_nuc}{Threshold of ambiguous nucleotides to accept in fasta entry. Complete entry will get discarded otherwise.}

\item{max_samples}{Maximum number of samples to use from one file. If not \code{NULL} and file has more than \code{max_samples} samples, will randomly choose a
subset of \code{max_samples} samples.}

\item{file_filter}{Vector of file names to use from path_corpus.}

\item{concat_seq}{Character string or \code{NULL}. If not \code{NULL} all entries from file get concatenated to one sequence with \code{concat_seq} string between them.
Example: If 1.entry AACC, 2. entry TTTG and \code{concat_seq = "ZZZ"} this becomes AACCZZZTTTG.}

\item{use_coverage}{Integer or \code{NULL}. If not \code{NULL}, use coverage as encoding rather than one-hot encoding and normalize.
Coverage information must be contained in fasta header: there must be a string \code{"cov_n"} in the header, where \code{n} is some integer.}

\item{set_learning}{When you want to assign one label to set of samples. Only implemented for \code{train_type = "label_folder"}.
Input is a list with the following parameters
\itemize{
\item \code{samples_per_target}: how many samples to use for one target.
\item \code{maxlen}: length of one sample.
\item \code{reshape_mode}: \verb{"time_dist", "multi_input"} or \code{"concat"}.
\itemize{
\item
If \code{reshape_mode} is \code{"multi_input"}, generator will produce \code{samples_per_target} separate inputs, each of length \code{maxlen} (model should have
\code{samples_per_target} input layers).
\item If reshape_mode is \code{"time_dist"}, generator will produce a 4D input array. The dimensions correspond to
\verb{(batch_size, samples_per_target, maxlen, length(vocabulary))}.
\item If \code{reshape_mode} is \code{"concat"}, generator will concatenate \code{samples_per_target} sequences
of length \code{maxlen} to one long sequence.
}
\item If \code{reshape_mode} is \code{"concat"}, there is an additional \code{buffer_len}
argument. If \code{buffer_len} is an integer, the subsequences are interspaced with \code{buffer_len} rows. The input length is
(\code{maxlen} \eqn{*} \code{samples_per_target}) + \code{buffer_len} \eqn{*} (\code{samples_per_target} - 1).
}}

\item{proportion_entries}{Proportion of fasta entries to keep. For example, if fasta file has 50 entries and \code{proportion_entries = 0.1},
will randomly select 5 entries.}

\item{sample_by_file_size}{Sample new file weighted by file size (bigger files more likely).}

\item{n_gram}{Integer, encode target not nucleotide wise but combine n nucleotides at once. For example for \verb{n=2, "AA" ->  (1, 0,..., 0),}
\verb{"AC" ->  (0, 1, 0,..., 0), "TT" -> (0,..., 0, 1)}, where the one-hot vectors have length \code{length(vocabulary)^n}.}

\item{n_gram_stride}{Step size for n-gram encoding. For AACCGGTT with \code{n_gram = 4} and \code{n_gram_stride = 2}, generator encodes
\verb{(AACC), (CCGG), (GGTT)}; for \code{n_gram_stride = 4} generator encodes \verb{(AACC), (GGTT)}.}

\item{add_noise}{\code{NULL} or list of arguments. If not \code{NULL}, list must contain the following arguments: \code{noise_type} can be \code{"normal"} or \code{"uniform"};
optional arguments \code{sd} or \code{mean} if noise_type is \code{"normal"} (default is \code{sd=1} and \code{mean=0}) or \verb{min, max} if \code{noise_type} is \code{"uniform"}
(default is \verb{min=0, max=1}).}

\item{return_int}{Whether to return integer encoding or one-hot encoding.}

\item{reshape_xy}{Can be a list of functions to apply to input and/or target. List elements (containing the reshape functions)
must be called x for input or y for target and each have arguments called x and y. For example:
\code{reshape_xy = list(x = function(x, y) {return(x+1)}, y = function(x, y) {return(x+y)})} .
For rds generator needs to have an additional argument called sw.}
}
\value{
List of generator function.
}
\description{
Initializes generators defined by \code{\link{generator_fasta_label_folder}} function. Targets get encoded in order of directories.
Number of classes is given by length of \code{directories}.
}
\examples{
\dontshow{if (reticulate::py_module_available("tensorflow")) (if (getRversion() >= "3.4") withAutoprint else force)(\{ # examplesIf}
# create two folders with dummy fasta files
path_input_1 <- tempfile()
dir.create(path_input_1)
create_dummy_data(file_path = path_input_1, num_files = 2, seq_length = 5,
                  num_seq = 2, vocabulary = c("a", "c", "g", "t"))
path_input_2 <- tempfile()
dir.create(path_input_2)
create_dummy_data(file_path = path_input_2, num_files = 3, seq_length = 7,
                  num_seq = 5, vocabulary = c("a", "c", "g", "t"))

gen_list <- generator_initialize(directories = c(path_input_1, path_input_1),
                                        batch_size = 4, maxlen = 5)
z1 <- gen_list[[1]]()
z1[[1]]
z1[[2]]
\dontshow{\}) # examplesIf}
}