A list with parameters customizing a UMAP embedding. Each component of the list is an effective argument for umap().
umap.defaultsAn object of class umap.config of length 21.
n_neighbors: integer; number of nearest neighbors
n_components: integer; dimension of target (output) space
metric: character or function; determines how distances between data points are computed. When using a string, available metrics are: euclidean, manhattan. Other available generalized metrics are: cosine, pearson, pearson2. Note the triangle inequality may not be satisfied by some generalized metrics, hence knn search may not be optimal. When using metric.function as a function, the signature must be function(matrix, origin, target) and should compute a distance between the origin column and the target columns
n_epochs: integer; number of iterations performed during layout optimization
input: character, use either "data" or "dist"; determines whether the primary input argument to umap() is treated as a data matrix or as a distance matrix
init: character or matrix. The default string "spectral" computes an initial embedding using eigenvectors of the connectivity graph matrix. An alternative is the string "random", which creates an initial layout based on random coordinates. This setting.can also be set to a matrix, in which case layout optimization begins from the provided coordinates.
min_dist: numeric; determines how close points appear in the final layout
set_op_ratio_mix_ratio: numeric in range [0,1]; determines who the knn-graph is used to create a fuzzy simplicial graph
local_connectivity: numeric; used during construction of fuzzy simplicial set
bandwidth: numeric; used during construction of fuzzy simplicial set
alpha: numeric; initial value of "learning rate" of layout optimization
gamma: numeric; determines, together with alpha, the learning rate of layout optimization
negative_sample_rate: integer; determines how many non-neighbor points are used per point and per iteration during layout optimization
a: numeric; contributes to gradient calculations during layout optimization. When left at NA, a suitable value will be estimated automatically.
b: numeric; contributes to gradient calculations during layout optimization.
spread: numeric; used during automatic estimation of a/b parameters.
random_state: integer; seed for random number generation used during umap()
transform_state: integer; seed for random number generation used during predict()
knn.repeat: number of times to restart knn search
verbose: logical or integer; determines whether to show progress messages
umap_learn_args: vector of arguments to python package umap-learn
# NOT RUN {
# display all default settings
umap.defaults
# create a new settings object with n_neighbors set to 5
custom.settings = umap.defaults
custom.settings$n_neighbors = 5
custom.settings
# }
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