Dataset Information

Turbo-SMT: Accelerating Coupled Sparse Matrix-Tensor Factorizations by 200×.

ABSTRACT: How can we correlate the neural activity in the human brain as it responds to typed words, with properties of these terms (like 'edible', 'fits in hand')? In short, we want to find latent variables, that jointly explain both the brain activity, as well as the behavioral responses. This is one of many settings of the Coupled Matrix-Tensor Factorization (CMTF) problem. Can we accelerate any CMTF solver, so that it runs within a few minutes instead of tens of hours to a day, while maintaining good accuracy? We introduce TURBO-SMT, a meta-method capable of doing exactly that: it boosts the performance of any CMTF algorithm, by up to 200×, along with an up to 65 fold increase in sparsity, with comparable accuracy to the baseline. We apply TURBO-SMT to BRAINQ, a dataset consisting of a (nouns, brain voxels, human subjects) tensor and a (nouns, properties) matrix, with coupling along the nouns dimension. TURBO-SMT is able to find meaningful latent variables, as well as to predict brain activity with competitive accuracy.

SUBMITTER: Papalexakis EE

PROVIDER: S-EPMC4603425 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Publications

Turbo-SMT: Accelerating Coupled Sparse Matrix-Tensor Factorizations by 200×.

Papalexakis Evangelos E EE Faloutsos Christos C Mitchell Tom M TM Talukdar Partha Pratim PP Sidiropoulos Nicholas D ND Murphy Brian B

Proceedings of the ... SIAM International Conference on Data Mining. SIAM International Conference on Data Mining 20140101

How can we correlate the neural activity in the human brain as it responds to typed words, with properties of these terms (like 'edible', 'fits in hand')? In short, we want to find latent variables, that jointly explain both the brain activity, as well as the behavioral responses. This is one of many settings of the <i>Coupled Matrix-Tensor Factorization</i> (CMTF) problem. Can we accelerate <i>any</i> CMTF solver, so that it runs within a few minutes instead of tens of hours to a day, while mai ...[more]

PMID: 26473087

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Project description:Advances in neuronal recording techniques are leading to ever larger numbers of simultaneously monitored neurons. This poses the important analytical challenge of how to capture compactly all sensory information that neural population codes carry in their spatial dimension (differences in stimulus tuning across neurons at different locations), in their temporal dimension (temporal neural response variations), or in their combination (temporally coordinated neural population firing). Here we investigate the utility of tensor factorizations of population spike trains along space and time. These factorizations decompose a dataset of single-trial population spike trains into spatial firing patterns (combinations of neurons firing together), temporal firing patterns (temporal activation of these groups of neurons) and trial-dependent activation coefficients (strength of recruitment of such neural patterns on each trial). We validated various factorization methods on simulated data and on populations of ganglion cells simultaneously recorded in the salamander retina. We found that single-trial tensor space-by-time decompositions provided low-dimensional data-robust representations of spike trains that capture efficiently both their spatial and temporal information about sensory stimuli. Tensor decompositions with orthogonality constraints were the most efficient in extracting sensory information, whereas non-negative tensor decompositions worked well even on non-independent and overlapping spike patterns, and retrieved informative firing patterns expressed by the same population in response to novel stimuli. Our method showed that populations of retinal ganglion cells carried information in their spike timing on the ten-milliseconds-scale about spatial details of natural images. This information could not be recovered from the spike counts of these cells. First-spike latencies carried the majority of information provided by the whole spike train about fine-scale image features, and supplied almost as much information about coarse natural image features as firing rates. Together, these results highlight the importance of spike timing, and particularly of first-spike latencies, in retinal coding.

Dataset Information

Turbo-SMT: Accelerating Coupled Sparse Matrix-Tensor Factorizations by 200×.

Publications

Turbo-SMT: Accelerating Coupled Sparse Matrix-Tensor Factorizations by 200×.

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