Weakly-supervised text classification aims to induce text classifiers from only a few user-provided seed words. The vast majority of previous work assumes high-quality seed words are given. However, the expert-annotated seed words are sometimes non-t
rivial to come up with. Furthermore, in the weakly-supervised learning setting, we do not have any labeled document to measure the seed words' efficacy, making the seed word selection process a walk in the dark''. In this work, we remove the need for expert-curated seed words by first mining (noisy) candidate seed words associated with the category names. We then train interim models with individual candidate seed words. Lastly, we estimate the interim models' error rate in an unsupervised manner. The seed words that yield the lowest estimated error rates are added to the final seed word set. A comprehensive evaluation of six binary classification tasks on four popular datasets demonstrates that the proposed method outperforms a baseline using only category name seed words and obtained comparable performance as a counterpart using expert-annotated seed words.
This paper focuses on the estimation schemes of a viable position for timing belt
drives where the position of the carriage (load) is to be determined via reference models
receiving input from a position sensor attached to the actuator of the timin
g belt. A detailed
analysis of the transmission error sources is presented, and a number of relevant
mathematical models is developed using a priori knowledge of the process. This paper
demonstrates that such schemes are very effective when the drive system is not subjected
to external loads
and operating conditions do not change considerably i.e. ambient temperature, and
belt tension.