In this paper we investigate learning visual models for the steps of ordinary
tasks using weak supervision via instructional narrations and an ordered list
of steps instead of strong supervision via temporal annotations. At the heart
of our approach is the observation that weakly supervised learning may be
easier if a model shares components while learning different steps: `pour egg'
should be trained jointly with other tasks involving `pour' and `egg'. We
formalize this in a component model for recognizing steps and a weakly
supervised learning framework that can learn this model under temporal
constraints from narration and the list of steps. Past data does not permit
systematic studying of sharing and so we also gather a new dataset, CrossTask,
aimed at assessing cross-task sharing. Our experiments demonstrate that sharing
across tasks improves performance, especially when done at the component level
and that our component model can parse previously unseen tasks by virtue of its
compositionality.

采用弱监督学习框架，通过使用教学说明和有序步骤列表而非强监督学习形式的时间标注，学习普通任务中步骤的视觉模型，提出了一种组件模型用于识别步骤，实验结果表明，跨任务共享有助于提高组件水平的性能。