no code implementations • 6 Jul 2023 • Kumiko Tanaka-Ishii, Akira Tanaka
The Strahler number was originally proposed to characterize the complexity of river bifurcation and has found various applications.
no code implementations • 14 Sep 2020 • Kumiko Tanaka-Ishii, Shuntaro Takahashi
This article considers the fluctuation analysis methods of Taylor and Ebeling & Neiman.
no code implementations • ACL 2020 • Xin Du, Kumiko Tanaka-Ishii
The stock embedding is acquired with a deep learning framework using both news articles and price history.
no code implementations • 28 Jan 2020 • Daiki Hirano, Kumiko Tanaka-Ishii, Andrew Finch
The extraction of templates such as ``regard X as Y'' from a set of related phrases requires the identification of their internal structures.
no code implementations • CL 2019 • Shuntaro Takahashi, Kumiko Tanaka-Ishii
Statistical mechanical analyses have revealed that natural language text is characterized by scaling properties, which quantify the global structure in the vocabulary population and the long memory of a text.
no code implementations • 9 Jun 2018 • Kumiko Tanaka-Ishii, Hiroshi Terada
Word frequency is assumed to correlate with word familiarity, but the strength of this correlation has not been thoroughly investigated.
no code implementations • 24 Apr 2018 • Shuntaro Takahashi, Kumiko Tanaka-Ishii
Five such tests are considered, with the first two accounting for the vocabulary population and the other three for the long memory of natural language.
1 code implementation • ACL 2018 • Tatsuru Kobayashi, Kumiko Tanaka-Ishii
Taylor's law describes the fluctuation characteristics underlying a system in which the variance of an event within a time span grows by a power law with respect to the mean.
no code implementations • 11 Dec 2017 • Kumiko Tanaka-Ishii
Long-range correlation, a property of time series exhibiting long-term memory, is mainly studied in the statistical physics domain and has been reported to exist in natural language.
no code implementations • 16 Jul 2017 • Shuntaro Takahashi, Kumiko Tanaka-Ishii
Precisely, we demonstrate that a neural language model based on long short-term memory (LSTM) effectively reproduces Zipf's law and Heaps' law, two representative statistical properties underlying natural language.
no code implementations • WS 2016 • Ryosuke Takahira, Kumiko Tanaka-Ishii, {\L}ukasz D{\k{e}}bowski
The article presents results of entropy rate estimation for human languages across six languages by using large, state-of-the-art corpora of up to 7. 8 gigabytes.