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Shivani Thakur

Publications and source records attributed to Shivani Thakur.

2 recordsLinked to original sources

Enhancing Hate Speech Detection on Social Media: A Comparative Analysis of Machine Learning Models and Text Transformation Approaches

The proliferation of hate speech on social media platforms has necessitated the development of effective detection and moderation tools. This study evaluates the efficacy of various machine learning models in identifying hate speech and offensive language and investigates the potential of text transformation techniques to neutralize such content. We compare traditional models like CNNs and LSTMs with advanced neural network models such as BERT and its derivatives, alongside exploring hybrid models that combine different architectural features. Our results indicate that while advanced models like BERT show superior accuracy due to their deep contextual understanding, hybrid models exhibit improved capabilities in certain scenarios. Furthermore, we introduce innovative text transformation approaches that convert negative expressions into neutral ones, thereby potentially mitigating the impact of harmful content. The implications of these findings are discussed, highlighting the strengths and limitations of current technologies and proposing future directions for more robust hate speech detection systems.

cs.CL

A large anomalous Hall effect and Weyl nodes in bulk FeNi$_3$: a density functional theory study

In this work, we report the study of electronic structure, magnetism, and the existence of Weyl nodes in a pristine bulk FeNi$_{3}$, a member of Fe-Ni inver alloy compounds, known as good metal catalysts with high activity and stability for water splitting for a very long time. Our observation of Weyl points in the bulk FeNi$_{3}$ may lead to a new technology to design highly efficient topological catalysts. While the previous literature \cite{PhysRev.97.304} mainly focused on the thermal and catalytic properties of FeNi$_{3}$ we report the interplay of Fe $d$-Ni $d$ hybridization and spin-orbit coupling give rise to the ferromagnetic Weyl nodes in the bulk FeNi$_{3}$. Our study shows that the ground state of the bulk FeNi$_{3}$ is a Weyl metal with a large number of Weyl nodes at the Fermi energy away from high-symmetry $k$-points. Furthermore, we predict a large intrinsic anomalous Hall conductivity of about $10000~S/m$ at the ground state. In addition, we show the existence of Weyl nodes along the high symmetry $k$-points $~0.2eV$ above and $~0.05eV$ below self-consistent Fermi level that may be achieved either by the electron or hole doping, or by external perturbation. In this article, FeNi$_{3}$ has been studied to explore this scenario using first-principles density functional theory and subsequent Wannier90-based tight-binding method. Furthermore, we report the existence of two types of Weyl cones, type-I and type-II, $~0.2eV$ above the Fermi level. Our report provides a realistic material to further explore the intrinsic properties related to Weyl cones, and the spintronic applications.

cond-mat.mtrl-sci