Predicting New MCIA scores
Compiled: January 20, 2026
Predicting MCIA global (factor) scores for new test samples
It may be of interest to use the embedding that is calculated on a training sample set to predict scores on a test set (or, equivalently, on new data).
After loading the nipalsMCIA library, we randomly split the NCI60 cancer cell
line data into training and test sets.
Installation
# devel version
# install.packages("devtools")
devtools::install_github("Muunraker/nipalsMCIA", ref = "devel",
force = TRUE, build_vignettes = TRUE) # devel version# release version
if (!require("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install("nipalsMCIA")library(ggplot2)
library(MultiAssayExperiment)
library(nipalsMCIA)Split the data
data(NCI60)
set.seed(8)
num_samples <- dim(data_blocks[[1]])[1]
num_train <- round(num_samples * 0.7, 0)
train_samples <- sample.int(num_samples, num_train)
data_blocks_train <- data_blocks
data_blocks_test <- data_blocks
for (i in seq_along(data_blocks)) {
data_blocks_train[[i]] <- data_blocks_train[[i]][train_samples, ]
data_blocks_test[[i]] <- data_blocks_test[[i]][-train_samples, ]
}
# Split corresponding metadata
metadata_train <- data.frame(metadata_NCI60[train_samples, ],
row.names = rownames(data_blocks_train$mrna))
colnames(metadata_train) <- c("cancerType")
metadata_test <- data.frame(metadata_NCI60[-train_samples, ],
row.names = rownames(data_blocks_test$mrna))
colnames(metadata_test) <- c("cancerType")
# Create train and test mae objects
data_blocks_train_mae <- simple_mae(data_blocks_train, row_format = "sample",
colData = metadata_train)
data_blocks_test_mae <- simple_mae(data_blocks_test, row_format = "sample",
colData = metadata_test)Run nipalsMCIA on training data
MCIA_train <- nipals_multiblock(data_blocks = data_blocks_train_mae,
col_preproc_method = "colprofile", num_PCs = 10,
plots = "none", tol = 1e-9)Visualize model on training data using metadata on cancer type
The get_metadata_colors() function returns an assignment of a color for the
metadata columns. The nmb_get_gs() function returns the global scores from the
input NipalsResult object.
meta_colors <- get_metadata_colors(mcia_results = MCIA_train, color_col = 1,
color_pal_params = list(option = "E"))
global_scores <- nmb_get_gs(MCIA_train)
MCIA_out <- data.frame(global_scores[, 1:2])
MCIA_out$cancerType <- nmb_get_metadata(MCIA_train)$cancerType
colnames(MCIA_out) <- c("Factor.1", "Factor.2", "cancerType")
# plot the results
ggplot(data = MCIA_out, aes(x = Factor.1, y = Factor.2, color = cancerType)) +
geom_point(size = 3) +
labs(title = "MCIA for NCI60 training data") +
scale_color_manual(values = meta_colors) +
theme_bw()
Generate factor scores for test data using the MCIA_train model
We use the function to generate new factor scores on the test
data set using the MCIA_train model. The new dataset in the form of an MAE object
is input using the parameter test_data.
MCIA_test_scores <- predict_gs(mcia_results = MCIA_train,
test_data = data_blocks_test_mae)Visualize new scores with old
We once again plot the top two factor scores for both the training and test datasets
MCIA_out_test <- data.frame(MCIA_test_scores[, 1:2])
MCIA_out_test$cancerType <-
MultiAssayExperiment::colData(data_blocks_test_mae)$cancerType
colnames(MCIA_out_test) <- c("Factor.1", "Factor.2", "cancerType")
MCIA_out_test$set <- "test"
MCIA_out$set <- "train"
MCIA_out_full <- rbind(MCIA_out, MCIA_out_test)
rownames(MCIA_out_full) <- NULL
# plot the results
ggplot(data = MCIA_out_full,
aes(x = Factor.1, y = Factor.2, color = cancerType, shape = set)) +
geom_point(size = 3) +
labs(title = "MCIA for NCI60 training and test data") +
scale_color_manual(values = meta_colors) +
theme_bw()
Session Info
Session Info
sessionInfo()## R Under development (unstable) (2026-01-15 r89304)
## Platform: x86_64-pc-linux-gnu
## Running under: Ubuntu 24.04.3 LTS
##
## Matrix products: default
## BLAS: /home/biocbuild/bbs-3.23-bioc/R/lib/libRblas.so
## LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.12.0 LAPACK version 3.12.0
##
## locale:
## [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
## [3] LC_TIME=en_GB LC_COLLATE=C
## [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
## [7] LC_PAPER=en_US.UTF-8 LC_NAME=C
## [9] LC_ADDRESS=C LC_TELEPHONE=C
## [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
##
## time zone: America/New_York
## tzcode source: system (glibc)
##
## attached base packages:
## [1] stats4 grid stats graphics grDevices utils datasets
## [8] methods base
##
## other attached packages:
## [1] MultiAssayExperiment_1.37.2 SummarizedExperiment_1.41.0
## [3] Biobase_2.71.0 GenomicRanges_1.63.1
## [5] Seqinfo_1.1.0 IRanges_2.45.0
## [7] S4Vectors_0.49.0 BiocGenerics_0.57.0
## [9] generics_0.1.4 MatrixGenerics_1.23.0
## [11] matrixStats_1.5.0 stringr_1.6.0
## [13] nipalsMCIA_1.9.1 ggpubr_0.6.2
## [15] ggplot2_4.0.1 fgsea_1.37.4
## [17] dplyr_1.1.4 ComplexHeatmap_2.27.0
## [19] BiocStyle_2.39.0
##
## loaded via a namespace (and not attached):
## [1] rlang_1.1.7 magrittr_2.0.4 clue_0.3-66
## [4] GetoptLong_1.1.0 otel_0.2.0 compiler_4.6.0
## [7] png_0.1-8 vctrs_0.7.0 pkgconfig_2.0.3
## [10] shape_1.4.6.1 crayon_1.5.3 fastmap_1.2.0
## [13] backports_1.5.0 magick_2.9.0 XVector_0.51.0
## [16] labeling_0.4.3 rmarkdown_2.30 pracma_2.4.6
## [19] tinytex_0.58 purrr_1.2.1 xfun_0.56
## [22] cachem_1.1.0 jsonlite_2.0.0 DelayedArray_0.37.0
## [25] BiocParallel_1.45.0 broom_1.0.11 parallel_4.6.0
## [28] cluster_2.1.8.1 R6_2.6.1 bslib_0.9.0
## [31] stringi_1.8.7 RColorBrewer_1.1-3 car_3.1-3
## [34] jquerylib_0.1.4 Rcpp_1.1.1 bookdown_0.46
## [37] iterators_1.0.14 knitr_1.51 BiocBaseUtils_1.13.0
## [40] Matrix_1.7-4 tidyselect_1.2.1 dichromat_2.0-0.1
## [43] abind_1.4-8 yaml_2.3.12 doParallel_1.0.17
## [46] codetools_0.2-20 lattice_0.22-7 tibble_3.3.1
## [49] withr_3.0.2 S7_0.2.1 evaluate_1.0.5
## [52] circlize_0.4.17 pillar_1.11.1 BiocManager_1.30.27
## [55] carData_3.0-5 foreach_1.5.2 scales_1.4.0
## [58] glue_1.8.0 tools_4.6.0 data.table_1.18.0
## [61] RSpectra_0.16-2 ggsignif_0.6.4 fastmatch_1.1-8
## [64] cowplot_1.2.0 Cairo_1.7-0 tidyr_1.3.2
## [67] colorspace_2.1-2 Formula_1.2-5 cli_3.6.5
## [70] S4Arrays_1.11.1 viridisLite_0.4.2 gtable_0.3.6
## [73] rstatix_0.7.3 sass_0.4.10 digest_0.6.39
## [76] SparseArray_1.11.10 rjson_0.2.23 farver_2.1.2
## [79] htmltools_0.5.9 lifecycle_1.0.5 GlobalOptions_0.1.3