chihaya 1.13.0
The chihaya package saves DelayedArray objects for efficient, portable and stable reproduction of delayed operations in a new R session or other programming frameworks.
Check out the specification for more details.
Make a DelayedArray object with some operations:
library(DelayedArray)
x <- DelayedArray(matrix(runif(1000), ncol=10))
x <- x[11:15,] / runif(5)
x <- log2(x + 1)
x## <5 x 10> DelayedMatrix object of type "double":
## [,1] [,2] [,3] ... [,9] [,10]
## [1,] 0.60018211 1.00640715 0.96924964 . 1.003599748 1.073355962
## [2,] 0.10298337 1.38283605 1.02227239 . 0.230452499 1.442346031
## [3,] 0.67989460 0.05573421 0.99845825 . 0.695209080 0.569981064
## [4,] 0.68253020 0.99856263 1.18302686 . 0.032468579 0.009043181
## [5,] 3.27576973 2.44491239 0.69858611 . 1.593386031 2.768161129showtree(x)## 5x10 double: DelayedMatrix object
## └─ 5x10 double: Stack of 2 unary iso op(s)
## └─ 5x10 double: Unary iso op with args
## └─ 5x10 double: Subset
## └─ 100x10 double: [seed] matrix objectSave it into a HDF5 file with saveDelayed():
library(chihaya)
tmp <- tempfile(fileext=".h5")
saveDelayed(x, tmp)
rhdf5::h5ls(tmp)## group name otype dclass dim
## 0 / delayed H5I_GROUP
## 1 /delayed base H5I_DATASET FLOAT ( 0 )
## 2 /delayed method H5I_DATASET STRING ( 0 )
## 3 /delayed seed H5I_GROUP
## 4 /delayed/seed method H5I_DATASET STRING ( 0 )
## 5 /delayed/seed seed H5I_GROUP
## 6 /delayed/seed/seed along H5I_DATASET INTEGER ( 0 )
## 7 /delayed/seed/seed method H5I_DATASET STRING ( 0 )
## 8 /delayed/seed/seed seed H5I_GROUP
## 9 /delayed/seed/seed/seed index H5I_GROUP
## 10 /delayed/seed/seed/seed/index 0 H5I_DATASET INTEGER 5
## 11 /delayed/seed/seed/seed seed H5I_GROUP
## 12 /delayed/seed/seed/seed/seed data H5I_DATASET FLOAT 100 x 10
## 13 /delayed/seed/seed/seed/seed native H5I_DATASET INTEGER ( 0 )
## 14 /delayed/seed/seed side H5I_DATASET STRING ( 0 )
## 15 /delayed/seed/seed value H5I_DATASET FLOAT 5
## 16 /delayed/seed side H5I_DATASET STRING ( 0 )
## 17 /delayed/seed value H5I_DATASET FLOAT ( 0 )And then load it back in later:
y <- loadDelayed(tmp)
y## <5 x 10> DelayedMatrix object of type "double":
## [,1] [,2] [,3] ... [,9] [,10]
## [1,] 0.60018211 1.00640715 0.96924964 . 1.003599748 1.073355962
## [2,] 0.10298337 1.38283605 1.02227239 . 0.230452499 1.442346031
## [3,] 0.67989460 0.05573421 0.99845825 . 0.695209080 0.569981064
## [4,] 0.68253020 0.99856263 1.18302686 . 0.032468579 0.009043181
## [5,] 3.27576973 2.44491239 0.69858611 . 1.593386031 2.768161129Of course, this is not a particularly interesting case as we end up saving the original array inside our HDF5 file anyway. The real fun begins when you have some more interesting seeds.
We can use the delayed nature of the operations to avoid breaking sparsity. For example:
library(Matrix)
x <- rsparsematrix(1000, 1000, density=0.01)
x <- DelayedArray(x) + runif(1000)
tmp <- tempfile(fileext=".h5")
saveDelayed(x, tmp)
rhdf5::h5ls(tmp)## group name otype dclass dim
## 0 / delayed H5I_GROUP
## 1 /delayed along H5I_DATASET INTEGER ( 0 )
## 2 /delayed method H5I_DATASET STRING ( 0 )
## 3 /delayed seed H5I_GROUP
## 4 /delayed/seed data H5I_DATASET FLOAT 10000
## 5 /delayed/seed dimnames H5I_GROUP
## 6 /delayed/seed indices H5I_DATASET INTEGER 10000
## 7 /delayed/seed indptr H5I_DATASET INTEGER 1001
## 8 /delayed/seed shape H5I_DATASET INTEGER 2
## 9 /delayed side H5I_DATASET STRING ( 0 )
## 10 /delayed value H5I_DATASET FLOAT 1000file.info(tmp)[["size"]]## [1] 101826# Compared to a dense array.
tmp2 <- tempfile(fileext=".h5")
out <- HDF5Array::writeHDF5Array(x, tmp2, "data")
file.info(tmp2)[["size"]]## [1] 280549# Loading it back in.
y <- loadDelayed(tmp)
showtree(y)## 1000x1000 double: DelayedMatrix object
## └─ 1000x1000 double: Unary iso op with args
## └─ 1000x1000 double, sparse: [seed] dgCMatrix objectWe can also store references to external files, thus avoiding data duplication:
library(HDF5Array)
test <- HDF5Array(tmp2, "data")
stuff <- log2(test + 1)
stuff## <1000 x 1000> DelayedMatrix object of type "double":
## [,1] [,2] [,3] ... [,999] [,1000]
## [1,] 0.3003196 0.3003196 0.3003196 . 0.3003196 0.3003196
## [2,] 0.8974169 0.8974169 0.8974169 . 0.8974169 0.8974169
## [3,] 0.4315282 0.4315282 -4.3610784 . 0.4315282 0.4315282
## [4,] 0.2221985 0.2221985 0.2221985 . 0.2221985 0.2221985
## [5,] 0.7942106 0.7942106 0.7942106 . 0.7942106 0.7942106
## ... . . . . . .
## [996,] 0.14024181 0.14024181 0.14024181 . 0.14024181 0.14024181
## [997,] 0.63317790 0.63317790 0.63317790 . 0.63317790 0.63317790
## [998,] 0.01926272 0.01926272 0.01926272 . 0.01926272 0.01926272
## [999,] 0.93050826 0.93050826 0.93050826 . 0.93050826 0.93050826
## [1000,] 0.11214274 0.11214274 0.11214274 . 0.11214274 0.11214274tmp <- tempfile(fileext=".h5")
saveDelayed(stuff, tmp)
rhdf5::h5ls(tmp)## group name otype dclass dim
## 0 / delayed H5I_GROUP
## 1 /delayed base H5I_DATASET FLOAT ( 0 )
## 2 /delayed method H5I_DATASET STRING ( 0 )
## 3 /delayed seed H5I_GROUP
## 4 /delayed/seed method H5I_DATASET STRING ( 0 )
## 5 /delayed/seed seed H5I_GROUP
## 6 /delayed/seed/seed dimensions H5I_DATASET INTEGER 2
## 7 /delayed/seed/seed file H5I_DATASET STRING ( 0 )
## 8 /delayed/seed/seed name H5I_DATASET STRING ( 0 )
## 9 /delayed/seed/seed sparse H5I_DATASET INTEGER ( 0 )
## 10 /delayed/seed/seed type H5I_DATASET STRING ( 0 )
## 11 /delayed/seed side H5I_DATASET STRING ( 0 )
## 12 /delayed/seed value H5I_DATASET FLOAT ( 0 )file.info(tmp)[["size"]] # size of the delayed operations + pointer to the actual file## [1] 49642y <- loadDelayed(tmp)
y## <1000 x 1000> DelayedMatrix object of type "double":
## [,1] [,2] [,3] ... [,999] [,1000]
## [1,] 0.3003196 0.3003196 0.3003196 . 0.3003196 0.3003196
## [2,] 0.8974169 0.8974169 0.8974169 . 0.8974169 0.8974169
## [3,] 0.4315282 0.4315282 -4.3610784 . 0.4315282 0.4315282
## [4,] 0.2221985 0.2221985 0.2221985 . 0.2221985 0.2221985
## [5,] 0.7942106 0.7942106 0.7942106 . 0.7942106 0.7942106
## ... . . . . . .
## [996,] 0.14024181 0.14024181 0.14024181 . 0.14024181 0.14024181
## [997,] 0.63317790 0.63317790 0.63317790 . 0.63317790 0.63317790
## [998,] 0.01926272 0.01926272 0.01926272 . 0.01926272 0.01926272
## [999,] 0.93050826 0.93050826 0.93050826 . 0.93050826 0.93050826
## [1000,] 0.11214274 0.11214274 0.11214274 . 0.11214274 0.11214274sessionInfo()## R version 4.6.0 Patched (2026-05-01 r89994)
## Platform: aarch64-apple-darwin23
## Running under: macOS Tahoe 26.3.1
##
## Matrix products: default
## BLAS: /Library/Frameworks/R.framework/Versions/4.6/Resources/lib/libRblas.0.dylib
## LAPACK: /Library/Frameworks/R.framework/Versions/4.6/Resources/lib/libRlapack.dylib; LAPACK version 3.12.1
##
## locale:
## [1] C/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
##
## time zone: America/New_York
## tzcode source: internal
##
## attached base packages:
## [1] stats4 stats graphics grDevices utils datasets methods
## [8] base
##
## other attached packages:
## [1] HDF5Array_1.41.0 h5mread_1.5.0 rhdf5_2.57.0
## [4] chihaya_1.13.0 DelayedArray_0.39.2 SparseArray_1.13.2
## [7] S4Arrays_1.13.0 abind_1.4-8 IRanges_2.47.1
## [10] S4Vectors_0.51.2 MatrixGenerics_1.25.0 matrixStats_1.5.0
## [13] BiocGenerics_0.59.2 generics_0.1.4 Matrix_1.7-5
## [16] BiocStyle_2.41.0
##
## loaded via a namespace (and not attached):
## [1] jsonlite_2.0.0 compiler_4.6.0 BiocManager_1.30.27
## [4] Rcpp_1.1.1-1.1 rhdf5filters_1.25.0 jquerylib_0.1.4
## [7] yaml_2.3.12 fastmap_1.2.0 lattice_0.22-9
## [10] R6_2.6.1 XVector_0.53.0 knitr_1.51
## [13] bookdown_0.46 bslib_0.11.0 rlang_1.2.0
## [16] cachem_1.1.0 xfun_0.57 sass_0.4.10
## [19] otel_0.2.0 cli_3.6.6 Rhdf5lib_2.1.0
## [22] digest_0.6.39 grid_4.6.0 lifecycle_1.0.5
## [25] evaluate_1.0.5 rmarkdown_2.31 tools_4.6.0
## [28] htmltools_0.5.9