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To emulate the plasticity of synaptic structures, memristors with robust multilevel resistive states are fabricated in this work using high\u2010density polycrystalline MAPbCl<jats:sub>3<\/jats:sub> nanowires (NWs) array that vertically integrated using solution method. In particular, the fabricated memristors exhibit both short\u2010 and long\u2010term plasticity and traits akin to biological synapses. A fabricated memristor device is precisely programmed to 18 resistive states and each state exhibits stable data retention of more than 100\u2009000\u2009s. Furthermore, a matrix processing unit using a 4\u2010by\u20104 memristor array is fabricated as the hardware core of an encoder\u2013decoder artificial neural network to demonstrate high accuracy and reliable in\u2010image font conversion. 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