Abstract: Methods and systems for generating a prediction for an event are disclosed. Method performed by a server system includes accessing a feature set corresponding to each data sample in an input dataset. Method further includes generating, by a set of decision trees associated with the server system, an intermediate prediction for the event based on applying the feature set on the set of decision trees. Method includes identifying an activated leaf node from each decision tree based on the intermediate prediction. Method includes generating a tree-based encoding indicating an encoded representation of the set of decision trees for each data sample based on an encoding type and the activated leaf node from each decision tree. Method includes generating the prediction. Herein, the prediction is calibrated by a calibration model associated with the server system based on the tree-based encoding for each data sample.

Abstract: Methods and systems for determining a representation of a node associated with a graph are disclosed. The method performed by the server system includes accessing a multi-partite sub-graph, including a central node connected with leaf nodes through paths. The method includes extracting a central node feature set associated with the central node and a leaf node feature set associated with each leaf node of the leaf nodes. The method includes determining, by a ML model, a first node representation for the central node based on a distinct relation type, the central node feature set, and the leaf node feature set. The method includes determining a second node representation for the central node based on concatenating individual path feature vectors of each path. The method includes determining a final node representation for the central node based, at least in part, on the first node representation and the second node representation.

Abstract: Methods and server systems for computing fraud risk scores for various merchants associated with an acquirer described herein. The method performed by a server system includes accessing merchant-related transaction data including merchant-related transaction indicators associated with a merchant from a transaction database. Method includes generating a merchant-related transaction features based on the merchant-related indicators. Method includes generating via risk prediction models, for a payment transaction with the merchant, merchant health and compliance risk scores, merchant terminal risk scores, merchant chargeback risk scores, and merchant activity risk scores based on the merchant-related transaction features. Method includes facilitating transmission of a notification message to an acquirer server associated with the merchant.

Abstract: Methods, systems, and computer-readable media for dynamic bucketization based on real-time access patterns are disclosed. Item identifiers corresponding to items in a data store are distributed among of buckets based at least in part on one or more bucket parameters. The item identifiers are divided into access windows within the buckets. Items corresponding to item identifiers in one or more access windows are loaded from the data store. Based at least in part on one or more access requests from a client with respect to the loaded items, one or more item identifiers are moved between access windows. The updated access windows with different sets of items are stored back to the data store.

Abstract: Methods and server systems for computing fraud risk scores for various merchants associated with an acquirer described herein. The method performed by a server system includes accessing merchant-related transaction data including merchant-related transaction indicators associated with a merchant from a transaction database. Method includes generating a merchant-related transaction features based on the merchant-related indicators. Method includes generating via risk prediction models, for a payment transaction with the merchant, merchant health and compliance risk scores, merchant terminal risk scores, merchant chargeback risk scores, and merchant activity risk scores based on the merchant-related transaction features. Method includes facilitating transmission of a notification message to an acquirer server associated with the merchant.

Abstract: A method of heating liquid fuel upstream of a combustor in a system where compressor discharge air is cooled before being supplied to fuel nozzles in the combustor includes the steps of passing the compressor discharge air through a heat exchanger in heat exchange relationship with the liquid fuel to heat the liquid fuel and cool the compressor discharge air; supplying the heated liquid fuel and the cooled compressor discharge air to the combustor.

Abstract: A method of heating liquid fuel upstream of a combustor in a system where compressor discharge air is cooled before being supplied to fuel nozzles in the combustor includes the steps of passing the compressor discharge air through a heat exchanger in heat exchange relationship with the liquid fuel to heat the liquid fuel and cool the compressor discharge air; supplying the heated liquid fuel and the cooled compressor discharge air to the combustor.