A popular open-source machine learning library (by Google) for building and training neural networks. TensorFlow (often via its high-level API Keras) is used by quant developers to create deep learning models (CNNs, RNNs, LSTMs) for trading. For example, one can train a TensorFlow model on historical Forex candles and integrate it into MetaTrader via the ONNX format or Python bridge. TensorFlow’s scalability makes it suitable for large-scale backtesting on high-frequency data.