3 Search Results for "Chen, Fei"

Document
Artifact
DOI: 10.4230/DARTS.8.2.14
Ferrite: A Judgmental Embedding of Session Types in Rust (Artifact)

Authors: Ruo Fei Chen, Stephanie Balzer, and Bernardo Toninho

Published in: DARTS, Volume 8, Issue 2, Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
This artifact provides a VirtualBox image containing the snapshots of source code for Ferrite and Servo at the time the main paper was published.
Cite as

Ruo Fei Chen, Stephanie Balzer, and Bernardo Toninho. Ferrite: A Judgmental Embedding of Session Types in Rust (Artifact). In Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022). Dagstuhl Artifacts Series (DARTS), Volume 8, Issue 2, pp. 14:1-14:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@Article{chen_et_al:DARTS.8.2.14,
  author =	{Chen, Ruo Fei and Balzer, Stephanie and Toninho, Bernardo},
  title =	{{Ferrite: A Judgmental Embedding of Session Types in Rust (Artifact)}},
  pages =	{14:1--14:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2022},
  volume =	{8},
  number =	{2},
  editor =	{Chen, Ruo Fei and Balzer, Stephanie and Toninho, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DARTS.8.2.14},
  URN =		{urn:nbn:de:0030-drops-162125},
  doi =		{10.4230/DARTS.8.2.14},
  annote =	{Keywords: Session Types, Rust, DSL}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2022.22
Ferrite: A Judgmental Embedding of Session Types in Rust

Authors: Ruo Fei Chen, Stephanie Balzer, and Bernardo Toninho

Published in: LIPIcs, Volume 222, 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
Session types have proved viable in expressing and verifying the protocols of message-passing systems. While message passing is a dominant concurrency paradigm in practice, real world software is written without session types. A limitation of existing session type libraries in mainstream languages is their restriction to linear session types, precluding application scenarios that demand sharing and thus aliasing of channel references. This paper introduces Ferrite, a shallow embedding of session types in Rust that supports both linear and shared sessions. The formal foundation of Ferrite constitutes the shared session type calculus SILL_𝖲, which Ferrite encodes via a novel judgmental embedding technique. The fulcrum of the embedding is the notion of a typing judgment that allows reasoning about shared and linear resources to type a session. Typing rules are then encoded as functions over judgments, with a valid typing derivation manifesting as a well-typed Rust program. This Rust program generated by Ferrite serves as a certificate, ensuring that the application will proceed according to the protocol defined by the session type. The paper details the features and implementation of Ferrite and includes a case study on implementing Servo’s canvas component in Ferrite.
Cite as

Ruo Fei Chen, Stephanie Balzer, and Bernardo Toninho. Ferrite: A Judgmental Embedding of Session Types in Rust. In 36th European Conference on Object-Oriented Programming (ECOOP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 222, pp. 22:1-22:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{chen_et_al:LIPIcs.ECOOP.2022.22,
  author =	{Chen, Ruo Fei and Balzer, Stephanie and Toninho, Bernardo},
  title =	{{Ferrite: A Judgmental Embedding of Session Types in Rust}},
  booktitle =	{36th European Conference on Object-Oriented Programming (ECOOP 2022)},
  pages =	{22:1--22:28},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-225-9},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{222},
  editor =	{Ali, Karim and Vitek, Jan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2022.22},
  URN =		{urn:nbn:de:0030-drops-162501},
  doi =		{10.4230/LIPIcs.ECOOP.2022.22},
  annote =	{Keywords: Session Types, Rust, DSL}
}
Document
DOI: 10.4230/LIPIcs.ESA.2016.3
Beating Ratio 0.5 for Weighted Oblivious Matching Problems

Authors: Melika Abolhassani, T.-H. Hubert Chan, Fei Chen, Hossein Esfandiari, MohammadTaghi Hajiaghayi, Mahini Hamid, and Xiaowei Wu

Published in: LIPIcs, Volume 57, 24th Annual European Symposium on Algorithms (ESA 2016)

Abstract
We prove the first non-trivial performance ratios strictly above 0.5 for weighted versions of the oblivious matching problem. Even for the unweighted version, since Aronson, Dyer, Frieze, and Suen first proved a non-trivial ratio above 0.5 in the mid-1990s, during the next twenty years several attempts have been made to improve this ratio, until Chan, Chen, Wu and Zhao successfully achieved a significant ratio of 0.523 very recently (SODA 2014). To the best of our knowledge, our work is the first in the literature that considers the node-weighted and edge-weighted versions of the problem in arbitrary graphs (as opposed to bipartite graphs). (1) For arbitrary node weights, we prove that a weighted version of the Ranking algorithm has ratio strictly above 0.5. We have discovered a new structural property of the ranking algorithm: if a node has two unmatched neighbors at the end of algorithm, then it will still be matched even when its rank is demoted to the bottom. This property allows us to form LP constraints for both the node-weighted and the unweighted oblivious matching problems. As a result, we prove that the ratio for the node-weighted case is at least 0.501512. Interestingly via the structural property, we can also improve slightly the ratio for the unweighted case to 0.526823 (from the previous best 0.523166 in SODA 2014). (2) For a bounded number of distinct edge weights, we show that ratio strictly above 0.5 can be achieved by partitioning edges carefully according to the weights, and running the (unweighted) Ranking algorithm on each part. Our analysis is based on a new primal-dual framework known as \emph{matching coverage}, in which dual feasibility is bypassed. Instead, only dual constraints corresponding to edges in an optimal matching are satisfied. Using this framework we also design and analyze an algorithm for the edge-weighted online bipartite matching problem with free disposal. We prove that for the case of bounded online degrees, the ratio is strictly above 0.5.
Cite as

Melika Abolhassani, T.-H. Hubert Chan, Fei Chen, Hossein Esfandiari, MohammadTaghi Hajiaghayi, Mahini Hamid, and Xiaowei Wu. Beating Ratio 0.5 for Weighted Oblivious Matching Problems. In 24th Annual European Symposium on Algorithms (ESA 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 57, pp. 3:1-3:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{abolhassani_et_al:LIPIcs.ESA.2016.3,
  author =	{Abolhassani, Melika and Chan, T.-H. Hubert and Chen, Fei and Esfandiari, Hossein and Hajiaghayi, MohammadTaghi and Hamid, Mahini and Wu, Xiaowei},
  title =	{{Beating Ratio 0.5 for Weighted Oblivious Matching Problems}},
  booktitle =	{24th Annual European Symposium on Algorithms (ESA 2016)},
  pages =	{3:1--3:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-015-6},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{57},
  editor =	{Sankowski, Piotr and Zaroliagis, Christos},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2016.3},
  URN =		{urn:nbn:de:0030-drops-63443},
  doi =		{10.4230/LIPIcs.ESA.2016.3},
  annote =	{Keywords: Weighted matching, oblivious algorithms, Ranking, linear programming}
}
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