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I present a first determination of a set of collinear fragmentation functionsof charged pions using the NNPDF methodology. The analysis is based on a wideset of single-inclusive electron-positron annihilation data, including recentmeasurements from $B$-factory experiments, and is performed up tonext-to-next-to-leading order accuracy in perturbative quantum chromodynamics.I discuss the results of the fits, highlighting their quality in thedescription of the data, their stability upon the inclusion of higher-ordercorrections, and their comparison to other sets of fragmentation functions.

Towards a Neural Network Determination of Charged Pion Fragmentation Functions