Recognizing the emotional tone in spoken language is a challenging research problem that requires modeling not only the acoustic and textual modalities separately but also their crossinteractions. In this work, we introduce a hierarchical fusion scheme for sentiment analysis of spoken sentences. Two bidirectional Long-Short-Term-Memory networks (BiLSTM), followed by multiple fully connected layers, are trained in order to extract feature representations for each of the textual and audio modalities. The representations of the unimodal encoders are both fused at each layer and propagated forward, thus achieving fusion at the word, sentence and high/sentiment levels. The proposed approach of deep hierarchical fusion achieves stateof-the-art results for sentiment analysis tasks. Through an ablation study, we show that the proposed fusion method achieves greater performance gains over the unimodal baseline compared to other fusion approaches in the literature.
Modern businesses are obligated to conform to regulations to prevent physical injuries and ill health for anyone present on a site under their responsibility, such as customers, employees and visitors. Safety officers (SOs) are engineers, who perform site audits to businesses, record observations regarding possible safety issues and make appropriate recommendations. In this work, we develop a multimodal machine-learning architecture for the analysis and categorization of safety observations, given textual descriptions and images taken from the location sites. For this, we utilize a new multimodal dataset, Safety4All, which contains 5344 safety-related observations created by 86 SOs in 486 sites. An observation consists of a short issue description, written by the SOs, accompanied with images where the issue is shown, relevant metadata and a priority score. Our proposed architecture is based on the joint fine tuning of large pretrained language and image neural network models. Specifically, we propose the use of a joint task and contrastive loss, which aligns the text and vision representations in a joint multimodal space. The contrastive loss ensures that inter-modality representation distances are maintained, so that vision and language representations for similar samples are close in the shared multimodal space. We evaluate the proposed model on three tasks, namely, priority classification of input observations, observation assessment and observation categorization. Our experiments show that inspection scene images and textual descriptions provide complementary information, signifying the importance of both modalities. Furthermore, the use of the joint contrastive loss produces strong multimodal representations and outperforms a baseline simple model in tasks fusion. In addition, we train and release a large transformer-based language model for the Greek language based on the Electra architecture.
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