An Ensemble Learning Approach for Fast Disaster Response using Social Media Analytics

Natural disaster happens, as a result of natural hazards that cause financial, environmental or human losses. Natural disasters strike unexpectedly, affecting the lives of tens of thousands of people. During the flood, social media sites were also heavily used to disseminate information about flooded areas, rescue agencies, food and relief centres. This work proposes an ensemble learning strategy for combining and analysing social media data in order to close the gap and progress in catastrophic situation. To enable scalability and broad accessibility of the dynamic streaming of multimodal data namely text, image, audio and video, this work is designed around social media data. A fusion technique was employed at the decision level, based on a database of 15 characteristics for more than 300 disasters around the world (Trained with MNIST dataset 60000 training images and 10000 testing images).  This work allows the collected multimodal social media data to share a common semantic space, making individual variable prediction easier. Each  merged numerical vector(tensors) of text and audio  is sent into the K-CNN algorithm, which is an  unsupervised learning algorithm (K-CNN), and the  image and video data is given to a deep learning  based Progressive Neural Artificial Search (PNAS).  The trained data acts as a predictor for future  incidents, allowing for the estimation of total  deaths, total individuals impacted, and total  damage, as well as specific suggestions for food,  shelter and housing inspections. To make such a prediction, the trained model is presented a satellite image from before the accident as well as the geographic and demographic conditions, which is expected to result in a prediction accuracy of more than 85%

Ensemble of feature selection methods for text classification: An analytical study

In this paper, alternative models for ensembling of feature selection methods for text classification have been studied. An analytical study on three different models with various rank aggregation techniques has been made. The three models proposed for ensembling of feature selection are homogeneous ensemble, heterogeneous ensemble and hybrid ensemble. In homogeneous ensemble, the training feature matrix is randomly partitioned into multiple equal sized training matrices. A common feature evaluation function (FEF) is applied on all the smaller training matrices so as to obtain multiple ranks for each feature. Then a final score for each feature is computed by applying a suitable rank aggregation method. In heterogeneous ensemble, instead of partitioning the training matrix, multiple FEFs are applied onto the same training matrix to obtain multiple rankings for every feature. Then a final score for each feature is computed by applying a suitable rank aggregation method. Hybrid ensembling combines the ranks obtained by multiple homogeneous ensembling through multiple FEFs. It has been experimentally proven on two benchmarking text collections that, in most of the cases the proposed ensembling methods achieve better performance than that of any one of the feature selection methods when applied individually