Abstract
Neural networks are trained to judge whether or not an exotic state is a hadronic molecule of a given channel according its line-shapes. This method performs well in both trainings and validation tests. As applications, it is applied to study X(3872), X(4260) and Z_c(3900). The results show that Z_c(3900) should be regarded as a {bar{D}}^* D molecular state but X(3872) not. As for X(4260), it can not be a molecular state of chi _{c0}omega . Some discussions on X_1(2900) are also provided.
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