Created by: suytingwan

update fluid.layers.one_hot to fluid.one_hot

origin input shape : [20, 1] -> output shape : [20, 11318]

now input shape : [20, 1] -> output shape: [20, 1, 11318]

so, add a squeeze op to remove the axes 1, change [20, 1, 11318] to [20, 11318]

update pyreader, datafeeder to dataloader