Mahdi Molavi | Senior Backend Engineer & Tensor Researcher https://mahdimolavi.ir/ en Mahdi Molavi | Senior Backend Engineer & Tensor Researcher DataLife Engine Backend Notes 5: From Tensor Research to Backend Engineering https://mahdimolavi.ir/backend-notes/31-backend-notes-5-from-tensor-research-to-backend-engineering.html https://mahdimolavi.ir/backend-notes/31-backend-notes-5-from-tensor-research-to-backend-engineering.html Backend Notes 5: From Tensor Research to Backend Engineering

A personal note on what carried over from a master's thesis on tensor decompositions to more than ten years of .NET backend work: the shape of data, updating instead of recomputing, honest measurement and the math behind tools.

]]> admin Mon, 02 Nov 2026 10:00:00 +0330 Tensor Notes 5: From Brain Scans to Streaming Data https://mahdimolavi.ir/tensor-decompose/21-tensor-notes-5-brain-scans-streaming-data.html https://mahdimolavi.ir/tensor-decompose/21-tensor-notes-5-brain-scans-streaming-data.html Tensor Notes 5: From Brain Scans to Streaming Data

Detecting early mild cognitive impairment against healthy controls in resting-state fMRI with tc-SVD, and updating a tensor decomposition as new data streams in instead of recomputing it.

]]> admin Thu, 29 Oct 2026 10:00:00 +0330 IRT Calibration Notes 6: Equal Sample Sizes Are Not Equating https://mahdimolavi.ir/backend-notes/81-irt-calibration-notes-6-equal-sample-sizes-are-not-equating.html https://mahdimolavi.ir/backend-notes/81-irt-calibration-notes-6-equal-sample-sizes-are-not-equating.html IRT Calibration Notes 6: Equal Sample Sizes Are Not Equating

Equal N per track made year-to-year IRT comparisons more controlled, once a subtopic-key bug that hid 13 of 30 questions was fixed. Bar charts, boxplots, item information ranks and the scale-linking problem show why equal sample sizes are still not equating.

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