I am currently getting around 80% train and validation accuracy for my model. Just want to get some tips to modify the code and achieve higher accuracy.
import torch
import time
from torchvision import transforms, datasets, models
from torch.utils.data import DataLoader
import torch.nn as nn
import torch.optim as optim
image_transforms = {
'train': transforms.Compose([
transforms.RandomResizedCrop(size=256, scale=(0.8, 1.0)),
transforms.RandomRotation(degrees=15),
transforms.RandomHorizontalFlip(),
transforms.CenterCrop(size=224),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406],
[0.229, 0.224, 0.225])
]),
'valid': transforms.Compose([
transforms.Resize(size=256),
transforms.CenterCrop(size=224),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406],
[0.229, 0.224, 0.225])
]),
'test': transforms.Compose([
transforms.Resize(size=256),
transforms.CenterCrop(size=224),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406],
[0.229, 0.224, 0.225])
])
}
# Load the Data
# Set train and valid directory paths
train_directory = 'train'
valid_directory = 'valid'
test_directory = 'test'
# Batch size
bs = 16
# Number of classes
num_classes = 5
# Load Data from folders
data = {
'train': datasets.ImageFolder(root=train_directory, transform=image_transforms['train']),
'valid': datasets.ImageFolder(root=valid_directory, transform=image_transforms['valid']),
'test': datasets.ImageFolder(root=test_directory, transform=image_transforms['test'])
}
# Size of Data, to be used for calculating Average Loss and Accuracy
train_data_size = len(data['train'])
valid_data_size = len(data['valid'])
test_data_size = len(data['test'])
# Create iterators for the Data loaded using DataLoader module
train_data = DataLoader(data['train'], batch_size=bs, shuffle=True)
valid_data = DataLoader(data['valid'], batch_size=bs, shuffle=True)
test_data = DataLoader(data['test'], batch_size=bs, shuffle=True)
# Print the train, validation and test set data sizes
train_data_size, valid_data_size, test_data_size
# Load pretrained ResNet50 Model
resnet50 = models.resnet50(pretrained=True)
# Freeze model parameters
for param in resnet50.parameters():
param.requires_grad = False
# Change the final layer of ResNet50 Model for Transfer Learning
fc_inputs = resnet50.fc.in_features
resnet50.fc = nn.Sequential(
nn.Linear(fc_inputs, 256),
nn.ReLU(),
nn.Dropout(0.4),
nn.Linear(256, 5),
nn.LogSoftmax(dim=1) # For using NLLLoss()
)
loss_func = nn.NLLLoss()
optimizer = optim.Adam(resnet50.parameters())
if torch.cuda.is_available():
device = torch.device("cuda")
else:
device = torch.device("cpu")
for epoch in range(10):
epoch_start = time.time()
print("Epoch: {}/{}".format(epoch+1, 10))
# Set to training mode
resnet50.train()
# Loss and Accuracy within the epoch
train_loss = 0.0
train_acc = 0.0
valid_loss = 0.0
valid_acc = 0.0
for i, (inputs, labels) in enumerate(train_data):
inputs = inputs.to(device)
labels = labels.to(device)
# Clean existing gradients
optimizer.zero_grad()
# Forward pass - compute outputs on input data using the model
outputs = resnet50(inputs)
# Compute loss
loss = loss_func(outputs, labels)
# Backpropagate the gradients
loss.backward()
# Update the parameters
optimizer.step()
# Compute the total loss for the batch and add it to train_loss
train_loss += loss.item() * inputs.size(0)
# Compute the accuracy
ret, predictions = torch.max(outputs.data, 1)
correct_counts = predictions.eq(labels.data.view_as(predictions))
# Convert correct_counts to float and then compute the mean
acc = torch.mean(correct_counts.type(torch.FloatTensor))
# Compute total accuracy in the whole batch and add to train_acc
train_acc += acc.item() * inputs.size(0)
print("Batch number: {:03d}, Training: Loss: {:.4f}, Accuracy: {:.4f}".format(i, loss.item(), acc.item()))
# Validation - No gradient tracking needed
with torch.no_grad():
# Set to evaluation mode
resnet50.eval()
# Validation loop
for j, (inputs, labels) in enumerate(valid_data):
inputs = inputs.to(device)
labels = labels.to(device)
# Forward pass - compute outputs on input data using the model
outputs = resnet50(inputs)
# Compute loss
loss = loss_func(outputs, labels)
# Compute the total loss for the batch and add it to valid_loss
valid_loss += loss.item() * inputs.size(0)
# Calculate validation accuracy
ret, predictions = torch.max(outputs.data, 1)
correct_counts = predictions.eq(labels.data.view_as(predictions))
# Convert correct_counts to float and then compute the mean
acc = torch.mean(correct_counts.type(torch.FloatTensor))
# Compute total accuracy in the whole batch and add to valid_acc
valid_acc += acc.item() * inputs.size(0)
print("Validation Batch number: {:03d}, Validation: Loss: {:.4f}, Accuracy: {:.4f}".format(j, loss.item(), acc.item()))
# Find average training loss and training accuracy
avg_train_loss = train_loss/train_data_size
avg_train_acc = train_acc/float(train_data_size)
# Find average training loss and training accuracy
avg_valid_loss = valid_loss/valid_data_size
avg_valid_acc = valid_acc/float(valid_data_size)
#history.append([avg_train_loss, avg_valid_loss, avg_train_acc, avg_valid_acc])
epoch_end = time.time()
print("Epoch : {:03d}, Training: Loss: {:.4f}, Accuracy: {:.4f}%, \n\t\tValidation : Loss : {:.4f}, Accuracy: {:.4f}%, Time: {:.4f}s".format(epoch, avg_train_loss, avg_train_acc*100, avg_valid_loss, avg_valid_acc*100, epoch_end-epoch_start))
torch.save(resnet50, 'model/pretrained(ezy)(new)16bs.pth', _use_new_zipfile_serialization=False)
print('model saved')