super slow (10+ hours) shape inference

[nunoplopes]

[3456/3464] shape fused_moving_avg_obs_fake_quant
[3457/3464] shape rnn_tanh_cell
[3458/3464] shape rnn_relu_cell
[3459/3464] shape _embedding_bag_sparse_backward
bash: line 1: 130795 Terminated              ./infer_shapes _embedding_bag_sparse_backward > shapes/_embedding_bag_sparse_backward.txt 2> /dev/null
[3460/3464] shape _embedding_bag_dense_backward
bash: line 1:  1622 Terminated              ./infer_shapes _embedding_bag_dense_backward > shapes/_embedding_bag_dense_backward.txt 2> /dev/null
[3461/3464] shape cudnn_convolution_add_relu
bash: line 1: 130682 Terminated              ./infer_shapes cudnn_convolution_add_relu > shapes/cudnn_convolution_add_relu.txt 2> /dev/null
[3462/3464] shape batch_norm_backward_elemt
bash: line 1:  6466 Terminated              ./infer_shapes batch_norm_backward_elemt > shapes/batch_norm_backward_elemt.txt 2> /dev/null
[3463/3464] shape _embedding_bag_backward
bash: line 1: 130733 Terminated              ./infer_shapes _embedding_bag_backward > shapes/_embedding_bag_backward.txt 2> /dev/null

(killed after 10 hours)