Size-based tournaments for node selection. - Thomas Helmuth; Lee Spector; Brian Martin (GECCO (Companion), 2011)

Fecundity and selectivity in evolutionary computation. - Lee Spector; Thomas Helmuth; Kyle Ira Harrington (GECCO (Companion), 2011)

Tag-based modules in genetic programming. - Lee Spector; Brian Martin; Kyle Ira Harrington; Thomas Helmuth (GECCO, 2011)

Empirical investigation of size-based tournaments for node selection in genetic programming. - Thomas Helmuth; Lee Spector (GECCO (Companion), 2012)

Tag-based modularity in tree-based genetic programming. - Lee Spector; Kyle Ira Harrington; Thomas Helmuth (GECCO, 2012)

Evolving a digital multiplier with the pushgp genetic programming system. - Thomas Helmuth; Lee Spector (GECCO (Companion), 2013)

Uniform Linear Transformation with Repair and Alternation in Genetic Programming. - Lee Spector; Thomas Helmuth (GPTP, 2013)

Word count as a traditional programming benchmark problem for genetic programming. - Thomas Helmuth; Lee Spector (GECCO, 2014)

Effective simplification of evolved push programs using a simple, stochastic hill-climber. - Lee Spector; Thomas Helmuth (GECCO (Companion), 2014)

Analyzing a Decade of Human-Competitive ("HUMIE") Winners: What Can We Learn? - Karthik Kannappan; Lee Spector; Moshe Sipper; Thomas Helmuth; William G. La Cava; Jake Wisdom; Omri Bernstein (GPTP, 2014)

Genetic Programming with Epigenetic Local Search. - William G. La Cava; Thomas Helmuth; Lee Spector; Kourosh Danai (GECCO, 2015)

General Program Synthesis Benchmark Suite. - Thomas Helmuth; Lee Spector (GECCO, 2015)

Comparison of Semantic-aware Selection Methods in Genetic Programming. - Pawel Liskowski; Krzysztof Krawiec; Thomas Helmuth; Lee Spector (GECCO (Companion), 2015)

Lexicase Selection for Program Synthesis: A Diversity Analysis. - Thomas Helmuth; Nicholas Freitag McPhee; Lee Spector (GPTP, 2015)

Using Graph Databases to Explore the Dynamics of Genetic Programming Runs. - Nicholas Freitag McPhee; David Donatucci; Thomas Helmuth (GPTP, 2015)

Solving Uncompromising Problems With Lexicase Selection. - Thomas Helmuth; Lee Spector; James Matheson (IEEE Trans. Evol. Comput., 2015)

The Impact of Hyperselection on Lexicase Selection. - Thomas Helmuth; Nicholas Freitag McPhee; Lee Spector (GECCO, 2016)

Effects of Lexicase and Tournament Selection on Diversity Recovery and Maintenance. - Thomas Helmuth; Nicholas Freitag McPhee; Lee Spector (GECCO (Companion), 2016)

Visualizing Genetic Programming Ancestries. - Nicholas Freitag McPhee; Maggie M. Casale; Mitchell Finzel; Thomas Helmuth; Lee Spector (GECCO (Companion), 2016)

Evolution Evolves with Autoconstruction. - Lee Spector; Nicholas Freitag McPhee; Thomas Helmuth; Maggie M. Casale; Julian Oks (GECCO (Companion), 2016)

Linear Genomes for Structured Programs. - Thomas Helmuth; Lee Spector; Nicholas Freitag McPhee; Saul Shanabrook (GPTP, 2016)

A Detailed Analysis of a PushGP Run. - Nicholas Freitag McPhee; Mitchell D. Finzel; Maggie M. Casale; Thomas Helmuth; Lee Spector (GPTP, 2016)

Improving generalization of evolved programs through automatic simplification. - Thomas Helmuth; Nicholas Freitag McPhee; Edward R. Pantridge; Lee Spector (GECCO, 2017)

Visualizing genetic programming ancestries using graph databases. - Nicholas Freitag McPhee; Maggie M. Casale; Mitchell Finzel; Thomas Helmuth; Lee Spector (GECCO (Companion), 2017)

Using algorithm configuration tools to optimize genetic programming parameters: a case study. - Nicholas Freitag McPhee; Thomas Helmuth; Lee Spector (GECCO (Companion), 2017)

On the difficulty of benchmarking inductive program synthesis methods. - Edward R. Pantridge; Thomas Helmuth; Nicholas Freitag McPhee; Lee Spector (GECCO (Companion), 2017)

Relaxations of Lexicase Parent Selection. - Lee Spector; William G. La Cava; Saul Shanabrook; Thomas Helmuth; Edward R. Pantridge (GPTP, 2017)

Lexicase Selection with Weighted Shuffle. - Sarah Anne Troise; Thomas Helmuth (GPTP, 2017)

$ε$-Lexicase selection: a probabilistic and multi-objective analysis of lexicase selection in continuous domains. - William G. La Cava; Thomas Helmuth; Lee Spector; Jason H. Moore (CoRR, 2017)

A comparison of semantic-based initialization methods for genetic programming. - Hammad Ahmad; Thomas Helmuth (GECCO (Companion), 2018)

Program synthesis using uniform mutation by addition and deletion. - Thomas Helmuth; Nicholas Freitag McPhee; Lee Spector (GECCO, 2018)

Specialization and elitism in lexicase and tournament selection. - Edward R. Pantridge; Thomas Helmuth; Nicholas Freitag McPhee; Lee Spector (GECCO (Companion), 2018)

Lexicase selection of specialists. - Thomas Helmuth; Edward R. Pantridge; Lee Spector (GECCO, 2019)

Comparing and combining lexicase selection and novelty search. - Lia Jundt; Thomas Helmuth (GECCO, 2019)

Comparison of Linear Genome Representations for Software Synthesis. - Edward R. Pantridge; Thomas Helmuth; Lee Spector (GPTP, 2019)

A Probabilistic and Multi-Objective Analysis of Lexicase Selection and ε-Lexicase Selection. - William G. La Cava; Thomas Helmuth; Lee Spector; Jason H. Moore (Evol. Comput., 2019)

Benchmarking parent selection for program synthesis by genetic programming. - Thomas Helmuth; Amr M. Abdelhady (GECCO Companion, 2020)

Transfer Learning of Genetic Programming Instruction Sets. - Thomas Helmuth; Edward R. Pantridge; Grace Woolson; Lee Spector (GECCO Companion, 2020)

Counterexample-driven genetic programming without formal specifications. - Thomas Helmuth; Lee Spector; Edward R. Pantridge (GECCO Companion, 2020)

Genetic Source Sensitivity and Transfer Learning in Genetic Programming. - Thomas Helmuth; Edward R. Pantridge; Grace Woolson; Lee Spector (ALIFE, 2020)

Explaining and Exploiting the Advantages of Down-sampled Lexicase Selection. - Thomas Helmuth; Lee Spector (ALIFE, 2020)

On the importance of specialists for lexicase selection. - Thomas Helmuth; Edward R. Pantridge; Lee Spector (Genet. Program. Evolvable Mach., 2020)

Lexicase Selection. - Thomas Helmuth; William G. La Cava (GECCO Companion, 2021)

PSB2: the second program synthesis benchmark suite. - Thomas Helmuth; Peter Kelly (GECCO, 2021)

Going faster and hence further with lexicase selection. - Li Ding 010; Ryan Boldi; Thomas Helmuth; Lee Spector (GECCO Companion, 2022)

Lexicase selection at scale. - Li Ding 010; Ryan Boldi; Thomas Helmuth; Lee Spector (GECCO Companion, 2022)

Functional code building genetic programming. - Edward R. Pantridge; Thomas Helmuth; Lee Spector (GECCO, 2022)

Environments with local scopes for modules in genetic programming. - Anil Kumar Saini; Lee Spector; Thomas Helmuth (GECCO Companion, 2022)

Population Diversity Leads to Short Running Times of Lexicase Selection. - Thomas Helmuth; Johannes Lengler; William G. La Cava (PPSN (2), 2022)

The Environmental Discontinuity Hypothesis for Down-Sampled Lexicase Selection. - Ryan Boldi; Thomas Helmuth; Lee Spector (CoRR, 2022)

Applying genetic programming to PSB2: the next generation program synthesis benchmark suite. - Thomas Helmuth; Peter Kelly (Genet. Program. Evolvable Mach., 2022)

Problem-Solving Benefits of Down-Sampled Lexicase Selection. - Thomas Helmuth; Lee Spector (Artif. Life, 2022)

The Problem Solving Benefits of Down-sampling Vary by Selection Scheme. - Ryan Boldi; Ashley Bao; Martin Briesch; Thomas Helmuth; Dominik Sobania; Lee Spector; Alexander Lalejini (GECCO Companion, 2023)

A Static Analysis of Informed Down-Samples. - Ryan Boldi; Alexander Lalejini; Thomas Helmuth; Lee Spector (GECCO Companion, 2023)

Human-Driven Genetic Programming for Program Synthesis: A Prototype. - Thomas Helmuth; James Gunder Frazier; Yuhan Shi; Ahmed Farghali Abdelrehim (GECCO Companion, 2023)

Solving Novel Program Synthesis Problems with Genetic Programming using Parametric Polymorphism. - Edward R. Pantridge; Thomas Helmuth (GECCO, 2023)

Analyzing the Interaction Between Down-Sampling and Selection. - Ryan Boldi; Ashley Bao; Martin Briesch; Thomas Helmuth; Dominik Sobania; Lee Spector; Alexander Lalejini (CoRR, 2023)

Generational Computation Reduction in Informal Counterexample-Driven Genetic Programming. - Thomas Helmuth; Edward R. Pantridge; James Gunder Frazier; Lee Spector (EuroGP, 2024)

A Comprehensive Analysis of Down-sampling for Genetic Programming-based Program Synthesis. - Ryan Boldi; Ashley Bao; Martin Briesch; Thomas Helmuth; Dominik Sobania; Lee Spector; Alexander Lalejini (GECCO Companion, 2024)

Improving Lexicase Selection with Informed Down-Sampling. - Martin Briesch; Ryan Boldi; Dominik Sobania; Alexander Lalejini; Thomas Helmuth; Franz Rothlauf; Charles Ofria; Lee Spector (GECCO Companion, 2024)

Explaining Automatically Designed Software Defined Perimeters with a Two Phase Evolutionary Computation System. - James Gunder Frazier; Thomas Helmuth (GECCO Companion, 2024)

Facilitating Function Application in Code Building Genetic Programming. - Thomas Helmuth; Jayden Fedoroff; Edward R. Pantridge; Lee Spector (GECCO, 2024)

Informed Down-Sampled Lexicase Selection: Identifying Productive Training Cases for Efficient Problem Solving. - Ryan Boldi; Martin Briesch; Dominik Sobania; Alexander Lalejini; Thomas Helmuth; Franz Rothlauf; Charles Ofria; Lee Spector (Evol. Comput., 2024)