mnist_svhn_classifiers

Classifiers for MNIST and SVHN. Snippet of code on how to load them after downloading the files in data_path.

import os

import torch
import torch.nn.functional as F
from torch import nn, optim
from torch.utils.data import DataLoader
from torchvision.datasets import MNIST, SVHN
from torchvision.transforms import ToTensor


class SVHN_Classifier(nn.Module):
    def __init__(self):
        super(SVHN_Classifier, self).__init__()
        self.conv1 = nn.Conv2d(3, 10, kernel_size=5)
        self.conv2 = nn.Conv2d(10, 20, kernel_size=5)
        self.conv2_drop = nn.Dropout2d()
        self.fc1 = nn.Linear(500, 50)
        self.fc2 = nn.Linear(50, 10)

    def forward(self, x):
        x = F.relu(F.max_pool2d(self.conv1(x), 2))
        x = F.relu(F.max_pool2d(self.conv2_drop(self.conv2(x)), 2))
        x = x.view(-1, 500)
        x = F.relu(self.fc1(x))
        x = F.dropout(x, training=self.training)
        x = self.fc2(x)
        return F.log_softmax(x, dim=-1)


class MNIST_Classifier(nn.Module):
    def __init__(self):
        super(MNIST_Classifier, self).__init__()
        self.conv1 = nn.Conv2d(1, 10, kernel_size=5)
        self.conv2 = nn.Conv2d(10, 20, kernel_size=5)
        self.conv2_drop = nn.Dropout2d()
        self.fc1 = nn.Linear(320, 50)
        self.fc2 = nn.Linear(50, 10)

    def forward(self, x):
        x = F.relu(F.max_pool2d(self.conv1(x), 2))
        x = F.relu(F.max_pool2d(self.conv2_drop(self.conv2(x)), 2))
        x = x.view(-1, 320)
        x = F.relu(self.fc1(x))
        x = F.dropout(x, training=self.training)
        x = self.fc2(x)
        return F.log_softmax(x, dim=-1)


def load_mnist_svhn_classifiers(data_path, device="cuda"):
    c1 = MNIST_Classifier()
    c1.load_state_dict(torch.load(f"{data_path}/mnist.pt", map_location=device))
    c2 = SVHN_Classifier()
    c2.load_state_dict(torch.load(f"{data_path}/svhn.pt", map_location=device))
    return {"mnist": c1.to(device).eval(), "svhn": c2.to(device).eval()}