MIT Operations Research Center Cambridge, Massachusetts

Nicolás Acevedo Villena Optimization for consequential decisions.

Nicolás Acevedo Villena, photographed outdoors on a ridge.
PhD student in Operations Research

I develop optimization and data-driven methods for fair and reliable prediction, infrastructure modeling and planning, and scalable computation.

Research directions

Property assessment, the resource footprint of data centers, and first-order solvers on GPUs look unrelated from outside. Each is a computation that a decision rests on, and in each the useful work is being precise about what that computation can and cannot support.

  1. Fair & reliable predictive modeling

    Predictive systems whose errors carry distributional or institutional consequences — where accuracy alone is not the right objective.

  2. Infrastructure modeling & planning

    Energy, water, and environmental systems reconstructed from imperfect public records, with an explicit boundary between reported and modeled quantities.

  3. Scalable optimization & computation

    Decomposition, sparsity, and first-order methods on modern hardware, with numerical reliability that survives scale.

The three directions I am working on now, each with a public repository.

01 Fair & reliable predictive modeling

Fair and equitable predictive modeling for property assessment

How can mass-appraisal models improve predictive performance without worsening systematic vertical inequity across properties?

A mass-appraisal model can be made more accurate and still leave some owners systematically over-assessed; the two goals have to be optimized together.

Status
Ongoing research
Period
2024 — present
Read the case study: Fair and equitable predictive modeling for property assessment
Schematic. Attainable models sit above a frontier along which lower predictive error can only be bought with higher systematic inequity. No data is shown.
02 Infrastructure modeling & planning

Data-center infrastructure and externalities

How can public data support transparent, reproducible modeling of the infrastructure and resource externalities associated with large data centers when detailed operational telemetry is unavailable?

What a large data center draws from the grid, the water system and the aquifer around it can be partially reconstructed from public records — provided the reconstruction is explicit about which quantities are reported and which are modeled.

Status
Ongoing public-data modeling
Period
2026 — present
Read the case study: Data-center infrastructure and externalities
Schematic of the accounting boundary. Solid paths are supplied quantities, dashed paths leave the reported boundary. No data is shown.
03 Scalable optimization & computation

Reliable and scalable first-order optimization on GPUs

How can first-order optimization methods remain reliable when large-scale solvers are implemented on GPU hardware?

A first-order solver that runs fast on a GPU is only useful if its termination criteria still mean what they meant on a CPU.

Status
Ongoing research
Period
2024 — present
Read the case study: Reliable and scalable first-order optimization on GPUs
Schematic. Residuals fall until they reach a floor set by arithmetic rather than by the algorithm. No data is shown.

All research, including earlier work

Research in practice

July 2026

Cook County Assessor's Office

Merged support for the covariance-penalized LightGBM objective developed with the MIT research team into its open-source residential assessment model.

The objective is selectable in the model configuration as mse_cov. This records a change to a public codebase, not a measured effect on assessments or policy.

Selected outputs

  1. 2026

    Research repository

    Data-center systems (opens in a new tab)

    github.com/nicacevedo/data-center-externalities-modeling

  2. 2024

    Research code

    Property assessment (opens in a new tab)

    github.com/nicacevedo/soft-vertical-equity-constrained-mass-appraissal

  3. 2024

    Research software

    First-order methods on GPUs (opens in a new tab)

    github.com/nicacevedo/cuPDLP.jl

  4. 2023

    Master's thesis

    Column generation-based decomposition for large-scale feature selection problems

    N. Acevedo Villena · Universidad de Chile · Santiago, Chile

  5. 2022

    Conference presentation (unpublished)

    On the outlier detection for standardized tests

    N. Acevedo Villena, C. Thraves and M. Varas · XIV Chilean Conference on Operations Research (OPTIMA 2021) · Universidad Católica del Maule · Talca, Chile

All publications and research outputs

Background

PhD student at the MIT Operations Research Center, since September 2024.

I came to MIT from the Universidad de Chile, where I completed a master's in operations management and a bachelor's in industrial engineering. My master's thesis — a column-generation decomposition for large-scale feature selection — is where the interest in scalable convex optimization started. Between degrees I worked as a research engineer at Nezasa AG in Zurich on time-dependent routing, and with the Web Intelligence Centre and ACHS on demand forecasting and capacity planning for a hospital in Santiago.

I am advised by Saurabh Amin and Deep Deka. Earlier in the PhD I also received research guidance from Haihao Lu. Before MIT I worked with Fernando Ordóñez and Renaud Chicoisne on decomposition methods for feature selection, and with Charles Thraves and Ricardo Montoya at the Complex Engineering Systems Institute.

Outside research: music, climbing and time outdoors.

Full curriculum vitae

  1. 2024 — present Research PhD in Operations Research Massachusetts Institute of Technology
  2. 2023 — 2024 Research Researcher Web Intelligence Centre (WIC) / ACHS
  3. 2022 — 2023 Industry Research Engineer Nezasa AG / TripYeah
  4. 2022 — 2023 Education Master in Operations Management Universidad de Chile
  5. 2017 — 2021 Education Bachelor of Engineering Science, Industrial Engineering Universidad de Chile

Updates

  1. Public-data data-center modeling repository released

    Published a public-data modeling repository for data-center infrastructure and resource systems, beginning with a transparent Prineville case study.

  2. Covariance-penalized objective merged by the Cook County Assessor's Office

    The Cook County Assessor’s Office merged support for the covariance-penalized LightGBM objective developed with our MIT property-assessment research into its open-source residential assessment model, as pull request #475.

  3. Thesis distinction from the Universidad de Chile

    My master’s thesis received a thesis distinction from the Universidad de Chile’s School of Graduate Studies.

All updates