makepipe 
The goal of makepipe is to allow for the construction of make-like
pipelines in R with very minimal overheads. In contrast to targets
(and its predecessor drake) which offers an opinionated pipeline
framework that demands highly functionalised code, makepipe is
easy-going, being adaptable to a wide range of data science workflows.
A minimal example can be found here: https://github.com/kinto-b/makepipe_example
Installation
You can install the released version of makepipe from
CRAN with:
install.packages("makepipe")And the development version from GitHub with:
# install.packages("devtools")
devtools::install_github("kinto-b/makepipe")Building a pipeline
To construct a pipeline, one simply needs to chain together a number of
make_with_*() statements. When the pipeline is run through, each
make_with_*() block is evaluated if and only if the targets are
out-of-date with respect to the dependencies (and source file). But,
whether or not the block is evaluated, a segment will be added to the
Pipeline object behind the scenes. At the end of the script, once the
entire pipeline has been run through, one can display the accumulated
Pipeline object to produce a flow-chart visualisation of the pipeline.
For example:
make_with_source(
note = "Clean raw survey data and do derivations",
source = "one.R",
targets = "data/1 data.Rds",
dependencies = c("data/raw.Rds", "lookup/concordance.csv")
)
make_with_recipe(
label = "Merge it!",
note = "Merge demographic variables from population data into survey data",
recipe = {
dat <- readRDS("data/1 data.Rds")
pop <- readRDS("data/pop.Rds")
merged_dat <- merge(dat, pop, by = "id")
saveRDS(merged_dat, "data/2_data.Rds")
},
targets = c("data/2 data.Rds"),
dependencies = c("data/1 data.Rds", "data/pop.Rds")
)
make_with_source(
note = "Convert data from 'wide' to 'long' format",
source = "three.R",
targets = "data/3 data.Rds",
dependencies = "data/2 data.Rds"
)
show_pipeline()
We can also get an interactive visNetwork widget:
show_pipeline(as = "visnetwork")
Or a text summary (which can be saved to a .md file),
show_pipeline(as = "text")
#> # Pipeline
#>
#> ## one.R
#>
#> Clean raw survey data and do derivations
#>
#> * Source: 'one.R'
#> * Targets: 'data/1 data.Rds'
#> * File dependencies: 'data/raw.Rds', 'lookup/concordance.csv'
#> * Executed: FALSE
#> * Environment: 0x0000015399acfeb8
#>
#> ## Merge it!
#>
#> Merge demographic variables from population data into survey data
#>
#> * Recipe:
#>
#> {
#> dat <- readRDS("data/1 data.Rds")
#> pop <- readRDS("data/pop.Rds")
#> saveRDS(dat, "data/2_data.Rds")
#> }
#>
#> * Targets: 'data/2 data.Rds'
#> * File dependencies: 'data/1 data.Rds', 'data/pop.Rds'
#> * Executed: TRUE
#> * Execution time: 0.00103879 secs
#> * Result: 0 object(s)
#> * Environment: 0x0000015390c6c568
#>
#> ## three.R
#>
#> Convert data from 'wide' to 'long' format
#>
#> * Source: 'three.R'
#> * Targets: 'data/3 data.Rds'
#> * File dependencies: 'data/2 data.Rds'
#> * Executed: FALSE
#> * Environment: 0x00000153928570f8Once you’ve constructed a pipeline, you can ‘clean’ it (i.e. delete all registered targets):
p <- get_pipeline()
p$clean()Then, when you look again at the visualisation, the target nodes will be red not green since they’re out-of-date:
show_pipeline()
And then you can ‘rebuild’ to re-execute the entire pipeline and re-create the cleaned targets:
p <- get_pipeline()
p$build()Another way to build a pipeline is to add a roxygen header into your .R
scripts containing a special @makepipe tag along with the @targets,
@dependencies, and so on. For example, at the top of script one.R
you might have
#'@title Load
#'@description Clean raw survey data and do derivations
#'@dependencies "data/raw.Rds", "lookup/concordance.csv"
#'@targets "data/1 data.Rds"
#'@makepipe
NULLYou can then call make_with_dir(), which will construct a pipeline
using all the scripts it finds in the provided directory containing the
@makepipe tag.