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model.py
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model.py
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# Import the required libraries
import torch
import torch.nn as nn
import torch.optim as optim
import pytorch_lightning as pl
from criterion import TripletLoss, ContrastiveLoss
class Model(nn.Module):
def __init__(self):
super(Model, self).__init__()
def initialize(self, m):
if isinstance(m, (nn.Conv1d)):
nn.init.kaiming_uniform_(m.weight, mode="fan_in", nonlinearity="relu")
class SampleCNN(Model):
def __init__(self, strides, supervised, out_dim, device=None):
super(SampleCNN, self).__init__()
self.strides = strides
self.supervised = supervised
self.device = (
device
if device
else torch.device("cuda" if torch.cuda.is_available() else "cpu")
)
self.sequential = [
nn.Sequential(
nn.Conv1d(
in_channels=1, out_channels=128, kernel_size=3, stride=3, padding=0
),
nn.BatchNorm1d(128),
nn.ReLU(),
)
]
self.hidden = [
[128, 128],
[128, 128],
[128, 256],
[256, 256],
[256, 256],
[256, 256],
[256, 256],
[256, 256],
[256, 512],
]
assert len(self.hidden) == len(
self.strides
), "Number of hidden layers and strides are not equal"
for stride, (h_in, h_out) in zip(self.strides, self.hidden):
self.sequential.append(
nn.Sequential(
nn.Conv1d(
in_channels=h_in,
out_channels=h_out,
kernel_size=stride,
stride=1,
padding=1,
),
nn.BatchNorm1d(h_out),
nn.ReLU(),
nn.MaxPool1d(stride, stride=stride),
)
)
# 1 x 512
self.sequential.append(
nn.Sequential(
nn.Conv1d(
in_channels=512,
out_channels=512,
kernel_size=3,
stride=1,
padding=1,
),
nn.BatchNorm1d(512),
nn.ReLU(),
)
)
self.sequential = nn.Sequential(*self.sequential)
if self.supervised:
self.dropout = nn.Dropout(0.5)
self.fc = nn.Linear(512, out_dim)
def forward(self, x):
out = self.sequential(x)
if self.supervised:
out = self.dropout(out)
out = torch.mean(out, dim=2)
logit = self.fc(out)
return logit
class TripletNet(pl.LightningModule):
def __init__(
self, strides, supervised, out_dim, loss_type="triplet", *args, **kwargs
):
super().__init__()
# log hyperparameters
self.save_hyperparameters(ignore=["encoder"])
self.encoder = SampleCNN(strides, supervised, out_dim)
self.strides = self.encoder.strides
self.loss_type = loss_type
def forward(self, x):
return self.encoder(x)
def training_step(self, batch, batch_idx):
if self.loss_type == "triplet":
anchor, positive, negative = batch
anchor_embedding = self.encoder(anchor)
positive_embedding = self.encoder(positive)
negative_embedding = self.encoder(negative)
loss_function = self.get_loss_function()
train_loss = loss_function(
anchor_embedding, positive_embedding, negative_embedding
)
else: # self.loss_type == "contrastive":
sample1, sample2, label = batch
sample1_embedding = self.encoder(sample1)
sample2_embedding = self.encoder(sample2)
loss_function = self.get_loss_function()
train_loss = loss_function(sample1_embedding, sample2_embedding, label)
# Return the loss value for logging
self.log("train_loss", train_loss, sync_dist=True, rank_zero_only=True)
return train_loss
def validation_step(self, batch, batch_idx):
if self.loss_type == "triplet":
anchor, positive, negative = batch
anchor_embedding = self.encoder(anchor)
positive_embedding = self.encoder(positive)
negative_embedding = self.encoder(negative)
loss_function = self.get_loss_function()
val_loss = loss_function(
anchor_embedding, positive_embedding, negative_embedding
)
else: # self.loss_type == "contrastive":
sample1, sample2, label = batch
sample1_embedding = self.encoder(sample1)
sample2_embedding = self.encoder(sample2)
loss_function = self.get_loss_function()
val_loss = loss_function(sample1_embedding, sample2_embedding, label)
self.log("val_loss", val_loss, sync_dist=True, rank_zero_only=True)
return val_loss
def test_step(self, batch, batch_idx):
if self.loss_type == "triplet":
anchor, positive, negative = batch
anchor_embedding = self.encoder(anchor)
positive_embedding = self.encoder(positive)
negative_embedding = self.encoder(negative)
loss_function = self.get_loss_function()
test_loss = loss_function(
anchor_embedding, positive_embedding, negative_embedding
)
else: # self.loss_type == "contrastive":
sample1, sample2, label = batch
sample1_embedding = self.encoder(sample1)
sample2_embedding = self.encoder(sample2)
loss_function = self.get_loss_function()
test_loss = loss_function(sample1_embedding, sample2_embedding, label)
self.log("test_loss", test_loss, sync_dist=True, rank_zero_only=True)
return test_loss
def get_loss_function(self):
if self.loss_type == "triplet":
return TripletLoss()
elif self.loss_type == "contrastive":
return ContrastiveLoss()
else:
raise ValueError(f"Invalid loss type: {self.loss_type}")
def configure_optimizers(self):
optimizer = optim.AdamW(self.parameters(), lr=0.0003)
return optimizer