Task: AskUbuntu is broken

[pasky]

Somehow, the AskUbuntu (asku) task is broken and the models don't get trained:

RunID: asku-avg--5e692e270bddb64b-00  ({"Ddim": "1", "balance_class": "False", "batch_size": "192", "deep": "0", "e_add_flags": "True", "embdim": "300", "epoch_fract": "0.25", "f_add_kw": "False", "fix_layers": "[]", "inp_e_dropout": "0.333333333333", "inp_w_dropout": "0", "l2reg": "1e-05", "loss": "<function ranknet at 0x995b5f0>", "mlpsum": "sum", "nb_epoch": "16", "nb_runs": "4", "nnact": "relu", "nninit": "glorot_uniform", "opt": "adam", "pact": "tanh", "pdim": "1", "prescoring": "None", "prescoring_input": "None", "prescoring_prune": "None", "project": "True", "ptscorer": "<function mlp_ptscorer at 0x99631b8>", "wact": "linear", "wdim": "1", "wproject": "False"})
Model
Training
Epoch 1/16
323637/323518 [==============================] - 384s - loss: 0.6949                                                          val mrr 0.471191
Epoch 2/16
323543/323518 [==============================] - 373s - loss: 0.6933                                                          val mrr 0.463537
Epoch 3/16
323620/323518 [==============================] - 374s - loss: 0.6932                                                          val mrr 0.455145
Epoch 4/16
323677/323518 [==============================] - 384s - loss: 0.6932                                                          val mrr 0.454692