Search Results for author: Jianfei Zhang

Found 8 papers, 2 papers with code

Deep Calibration of Market Simulations using Neural Density Estimators and Embedding Networks

no code implementations20 Nov 2023 Namid R. Stillman, Rory Baggott, Justin Lyon, Jianfei Zhang, Dingqiu Zhu, Tao Chen, Perukrishnen Vytelingum

The ability to construct a realistic simulator of financial exchanges, including reproducing the dynamics of the limit order book, can give insight into many counterfactual scenarios, such as a flash crash, a margin call, or changes in macroeconomic outlook.

counterfactual

Towards systematic intraday news screening: a liquidity-focused approach

no code implementations11 Apr 2023 Jianfei Zhang, Mathieu Rosenbaum

Given the huge amount of news articles published each day, most of which are neutral, we present a systematic news screening method to identify the ``true'' impactful ones, aiming for more effective development of news sentiment learning methods.

Sentiment Analysis Sentiment Classification

Multi-asset market making under the quadratic rough Heston

no code implementations20 Dec 2022 Mathieu Rosenbaum, Jianfei Zhang

Given the promising results on joint modeling of SPX/VIX smiles of the recently introduced quadratic rough Heston model, we consider a multi-asset market making problem on SPX and its derivatives, e. g. VIX futures, SPX and VIX options.

Improving Variational Autoencoders with Density Gap-based Regularization

1 code implementation1 Nov 2022 Jianfei Zhang, Jun Bai, Chenghua Lin, Yanmeng Wang, Wenge Rong

There are effective ways proposed to prevent posterior collapse in VAEs, but we observe that they in essence make trade-offs between posterior collapse and hole problem, i. e., mismatch between the aggregated posterior distribution and the prior distribution.

Language Modelling Representation Learning

On the universality of the volatility formation process: when machine learning and rough volatility agree

no code implementations28 Jun 2022 Mathieu Rosenbaum, Jianfei Zhang

We train an LSTM network based on a pooled dataset made of hundreds of liquid stocks aiming to forecast the next daily realized volatility for all stocks.

Enhancing Dual-Encoders with Question and Answer Cross-Embeddings for Answer Retrieval

no code implementations Findings (EMNLP) 2021 Yanmeng Wang, Jun Bai, Ye Wang, Jianfei Zhang, Wenge Rong, Zongcheng Ji, Shaojun Wang, Jing Xiao

To keep independent encoding of questions and answers during inference stage, variational auto-encoder is further introduced to reconstruct answers (questions) from question (answer) embeddings as an auxiliary task to enhance QA interaction in representation learning in training stage.

Question Answering Representation Learning +2

Deep calibration of the quadratic rough Heston model

no code implementations4 Jul 2021 Mathieu Rosenbaum, Jianfei Zhang

The quadratic rough Heston model provides a natural way to encode Zumbach effect in the rough volatility paradigm.

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