mnist_draw_4.py

import os

import torch
import torch.nn as nn
import torch.nn.functional as F
import torch.optim as optim
import torchbearer
import torchvision
from torchbearer import Trial, callbacks
from torchvision import transforms

import visualise
from memory import Memory
import tb_modules as tm


MU = torchbearer.state_key('mu')
LOGVAR = torchbearer.state_key('logvar')
STAGES = torchbearer.state_key('stages')


class Block(nn.Module):
    def __init__(self, in_planes, out_planes, stride=1, padding=0):
        super(Block, self).__init__()
        self.conv = nn.Conv2d(in_planes, out_planes, kernel_size=3, padding=padding, stride=stride, bias=False)
        self.bn = nn.BatchNorm2d(out_planes)
        torch.nn.init.xavier_uniform_(self.conv.weight)

    def forward(self, x):
        out = F.relu(self.bn(self.conv(x)))
        return out


class InverseBlock(nn.Module):
    def __init__(self, in_planes, out_planes, stride=1, last=False, output_padding=0):
        super(InverseBlock, self).__init__()
        self.last = last

        self.conv = nn.ConvTranspose2d(in_planes, out_planes, kernel_size=3, output_padding=output_padding, stride=stride, bias=False)
        self.bn = nn.BatchNorm2d(out_planes)

        torch.nn.init.xavier_uniform_(self.conv.weight)

    def forward(self, x):
        if not self.last:
            out = F.relu(self.bn(self.conv(x)))
        else:
            out = self.bn(self.conv(x))
        return out


class ContextNet(nn.Module):
    def __init__(self):
        super(ContextNet, self).__init__()
        self.conv1 = Block(1, 64, stride=2)
        self.conv2 = Block(64, 128, stride=2)
        self.conv3 = Block(128, 256, stride=2)

    def forward(self, x):
        x = self.conv1(x)
        x = self.conv2(x)
        x = self.conv3(x)
        x = x.view(x.size(0), -1)
        return x


class GlimpseNet(nn.Module):
    def __init__(self):
        super(GlimpseNet, self).__init__()
        self.conv1 = Block(1, 128)

    def forward(self, x):
        x = self.conv1(x)
        x = x.view(x.size(0), -1)
        return x


class GlimpseDecoder(nn.Module):
    def __init__(self, h, w):
        super(GlimpseDecoder, self).__init__()
        self.h = h
        self.w = w

        self.conv1 = InverseBlock(128, 1, last=True)

    def forward(self, x):
        x = x.view(x.size(0), 128, self.h, self.w)
        x = self.conv1(x)
        return x


class MnistDraw(nn.Module):
    def __init__(self, count, memory_size, output_stages=False):
        super(MnistDraw, self).__init__()

        self.output_stages = output_stages

        self.memory = Memory(
            output_inverse=True,
            hidden_size=512,
            memory_size=memory_size,
            glimpse_size=4,
            g_down=512,
            c_down=1024,
            context_net=ContextNet(),
            glimpse_net=GlimpseNet()
        )

        self.decoder = GlimpseDecoder(2, 2)

        self.count = count
        self.qdown = nn.Linear(1024, memory_size)
        self.soft = nn.LogSoftmax(dim=1)

        self.drop = nn.Dropout(0.3)

        self.mu = nn.Linear(memory_size, 4)
        self.var = nn.Linear(memory_size, 4)

        self.sup = nn.Linear(4, 512)

        self.onehots = nn.Parameter(torch.eye(count), requires_grad=False)

        if output_stages:
            self.square = visualise.red_square(4, width=1).unsqueeze(0).cuda()

    def sample(self, mu, logvar):
        std = logvar.div(2).exp_()
        eps = std.data.new(std.size()).normal_()
        return mu + std * eps

    def forward(self, x, state=None):
        image = x
        canvas = torch.zeros_like(x.data) - 6.0

        x, context = self.memory.init(image)

        c_data = context.data
        query = F.relu6(self.qdown(c_data))

        mu = []
        var = []
        stages = []

        for i in range(self.count):
            x, inverse = self.memory.glimpse(x, image)
            out = self.memory(query)
            o_mu = self.mu(out)
            o_var = self.var(out)
            mu.append(o_mu)
            var.append(o_var)
            out = self.sample(o_mu, o_var)
            out = F.relu(self.sup(out))
            out = self.decoder(out)

            inverse = inverse.view(out.size(0), 2, 3)

            grid = F.affine_grid(inverse, torch.Size((out.size(0), out.size(1), image.size(2), image.size(3))))
            out = F.grid_sample(out, grid)

            canvas += out

            if self.output_stages:
                square = self.square.clone().repeat(out.size(0), 1, 1, 1)
                square = F.grid_sample(square, grid)

                stage_image = canvas.data.clone().sigmoid().repeat(1, 3, 1, 1)
                stage_image = stage_image + square
                stage_image = stage_image.clamp(0, 1)
                stages.append(stage_image.unsqueeze(1))

        if state is not None:
            state[torchbearer.Y_TRUE] = image
            state[MU] = torch.cat(mu, dim=1)
            state[LOGVAR] = torch.cat(var, dim=1)
            if self.output_stages:
                stages.append(image.clone().repeat(1, 3, 1, 1).unsqueeze(1))
                state[STAGES] = torch.cat(stages, dim=1)

        return F.sigmoid(canvas)


def draw(count, memory_size, file, device='cuda'):
    testtransform = transforms.Compose([transforms.ToTensor()])
    testset = torchvision.datasets.MNIST(root='./data/mnist', train=False,
                                         download=True, transform=testtransform)
    testloader = torch.utils.data.DataLoader(testset, pin_memory=True, batch_size=128,
                                             shuffle=True, num_workers=10)

    base_dir = os.path.join('mnist_' + str(memory_size), "4")

    model = MnistDraw(count, memory_size, output_stages=True)

    optimizer = optim.SGD(filter(lambda p: p.requires_grad, model.parameters()), lr=0)

    from datetime import datetime
    current_time = datetime.now().strftime('%b%d_%H-%M-%S')

    from visualise import StagesGrid

    trial = Trial(model, optimizer, nn.MSELoss(reduction='sum'), ['loss'], pass_state=True, callbacks=[
        callbacks.TensorBoardImages(comment=current_time, nrow=10, num_images=20, name='Prediction', write_each_epoch=True,
                                    key=torchbearer.Y_PRED, pad_value=1),
        callbacks.TensorBoardImages(comment=current_time + '_mnist', nrow=10, num_images=20, name='Target', write_each_epoch=False,
                                    key=torchbearer.Y_TRUE, pad_value=1),
        StagesGrid('mnist_stages.png', STAGES, 20)
    ]).load_state_dict(torch.load(os.path.join(base_dir, file)), resume=False).with_generators(train_generator=testloader, val_generator=testloader).for_train_steps(1).for_val_steps(1).to(device)

    trial.run()  # Evaluate doesn't work with tensorboard in torchbearer, seems to have been fixed in most recent version


def run(count, memory_size, iteration, device='cuda'):
    traintransform = transforms.Compose([transforms.RandomRotation(20), transforms.ToTensor()])
    trainset = torchvision.datasets.MNIST(root='./data/mnist', train=True,
                                          download=True, transform=traintransform)
    trainloader = torch.utils.data.DataLoader(trainset, pin_memory=True, batch_size=128,
                                              shuffle=True, num_workers=10)

    testtransform = transforms.Compose([transforms.ToTensor()])
    testset = torchvision.datasets.MNIST(root='./data/mnist', train=False,
                                         download=True, transform=testtransform)
    testloader = torch.utils.data.DataLoader(testset, pin_memory=True, batch_size=128,
                                             shuffle=True, num_workers=10)

    base_dir = os.path.join('mnist_' + str(memory_size), "4")

    model = MnistDraw(count, memory_size)

    optimizer = optim.Adam(filter(lambda p: p.requires_grad, model.parameters()), lr=1e-3)

    from datetime import datetime
    current_time = datetime.now().strftime('%b%d_%H-%M-%S')

    trial = Trial(model, optimizer, nn.MSELoss(reduction='sum'), ['loss'], pass_state=True, callbacks=[
        tm.kl_divergence(MU, LOGVAR),
        callbacks.MostRecent(os.path.join(base_dir, 'iter_' + str(iteration) + '.{epoch:02d}.pt')),
        callbacks.GradientClipping(5),
        callbacks.ExponentialLR(0.99),
        callbacks.TensorBoardImages(comment=current_time, name='Prediction', write_each_epoch=True,
                                    key=torchbearer.Y_PRED),
        callbacks.TensorBoardImages(comment=current_time + '_mnist', name='Target', write_each_epoch=True,
                                    key=torchbearer.Y_TRUE)
    ]).with_generators(train_generator=trainloader, val_generator=testloader).to(device)

    trial.run(100)


if __name__ == "__main__":
    run(12, 256, 0)
    draw(12, 256, 'iter_0.99.pt')