keras (version 2.9.0)

zip_lists: zip lists

Description

This is conceptually similar to zip() in Python, or R functions purrr::transpose() and data.table::transpose() (albeit, accepting elements in ... instead of a single list), with one crucial difference: if the provided objects are named, then matching is done by names, not positions.

Usage

zip_lists(...)

Value

A inverted list

Arguments

...

R lists or atomic vectors, optionally named.

Details

All arguments supplied must be of the same length. If positional matching is required, then all arguments provided must be unnamed. If matching by names, then all arguments must have the same set of names, but they can be in different orders.

Examples

gradients <- list("grad_for_wt_1", "grad_for_wt_2", "grad_for_wt_3")
weights <- list("weight_1", "weight_2", "weight_3")
str(zip_lists(gradients, weights))
str(zip_lists(gradient = gradients, weight = weights))

names(gradients) <- names(weights) <- paste0("layer_", 1:3)
str(zip_lists(gradients, weights[c(3, 1, 2)]))

names(gradients) <- paste0("gradient_", 1:3)
try(zip_lists(gradients, weights)) # error, names don't match
# call unname directly for positional matching
zip_lists(unname(gradients), unname(weights))