Comments (6)
π Hello @zuzell, thank you for your interest in YOLOv5 π! Please visit our βοΈ Tutorials to get started, where you can find quickstart guides for simple tasks like Custom Data Training all the way to advanced concepts like Hyperparameter Evolution.
If this is a π Bug Report, please provide a minimum reproducible example to help us debug it.
If this is a custom training β Question, please provide as much information as possible, including dataset image examples and training logs, and verify you are following our Tips for Best Training Results.
Requirements
Python>=3.8.0 with all requirements.txt installed including PyTorch>=1.8. To get started:
git clone https://github.com/ultralytics/yolov5 # clone
cd yolov5
pip install -r requirements.txt # install
Environments
YOLOv5 may be run in any of the following up-to-date verified environments (with all dependencies including CUDA/CUDNN, Python and PyTorch preinstalled):
- Notebooks with free GPU:
- Google Cloud Deep Learning VM. See GCP Quickstart Guide
- Amazon Deep Learning AMI. See AWS Quickstart Guide
- Docker Image. See Docker Quickstart Guide
Status
If this badge is green, all YOLOv5 GitHub Actions Continuous Integration (CI) tests are currently passing. CI tests verify correct operation of YOLOv5 training, validation, inference, export and benchmarks on macOS, Windows, and Ubuntu every 24 hours and on every commit.
Introducing YOLOv8 π
We're excited to announce the launch of our latest state-of-the-art (SOTA) object detection model for 2023 - YOLOv8 π!
Designed to be fast, accurate, and easy to use, YOLOv8 is an ideal choice for a wide range of object detection, image segmentation and image classification tasks. With YOLOv8, you'll be able to quickly and accurately detect objects in real-time, streamline your workflows, and achieve new levels of accuracy in your projects.
Check out our YOLOv8 Docs for details and get started with:
pip install ultralytics
from yolov5.
Hi there! π
It looks like you're on the right track with your approach to calculating gradients for explainability purposes. For the error you're encountering, it might be due to how you're accessing model components. Here's a simplified example to guide you through the process without assuming specifics of your environment:
# Assuming you've initialized your model and inputs correctly
model.eval() # Set the model to evaluation mode
inputs.requires_grad = True # Enable gradient calculation w.r.t. inputs
# Forward pass
preds = model(inputs)
# Your target definition might vary
loss_function = torch.nn.CrossEntropyLoss() # Example loss function
loss = loss_function(preds, target) # Compute loss
# Backward pass
loss.backward() # Computes the gradient of loss w.r.t. inputs
gradients = inputs.grad # Access the gradients
A few pointers:
- Ensure your
inputs
andtarget
are correctly defined and on the same device as your model. DetectMultiBackend
andComputeLoss
usage seems correct. Make sure any custom modifications do not interfere with the grad calculation.- The step
scaler.unscale_(optimizer)
is related to gradient scaling for mixed precision training. It's necessary if you're using an optimizer and want to modify gradients or apply gradient clipping before optimizer step. If you're just calculating gradients for XAI and not updating the model, it can be omitted.
Keep in mind, every AI explainability method may require slight adjustments to this basic process. If you have more specific errors or require further customization, please share additional details!
Happy coding! π
from yolov5.
Thank you very much for your answer! I managed to calculate the gradients on the loss class with some adjustments:
from utils.loss import ComputeLoss
from utils.dataloaders import create_dataloader
from models.common import DetectMultiBackend
model = DetectMultiBackend(weights=weights, device=device, dnn=dnn, data=data, fp16=half).float()
val_loader = create_dataloader(
data['val'],
imgsz,
batch_size,
gs,
shuffle=True,
prefix=colorstr("val: ")
)[0]
input, targets, paths, shapes = next(iter(val_loader))
if isinstance(hyp, str):
with open(hyp, errors="ignore") as f:
hyp = yaml.safe_load(f) # load hyps dict
model.hyp = hyp # attach hyperparameters to model
model.eval()
input = input.float()
input /= 255
input.requires_grad = True
pred= model(input) # Forward pass
compute_loss = ComputeLoss(model.model) # init loss class
loss, loss_items = compute_loss(pred[1], targets.to(device))
loss.backward() # Backward
gradients = input.grad.data # Get the gradients of the input with respect to the loss
I am using the ultralitics compute_loss class for loss computation here and it works. I just want to ask if it is possible to calculate a gradient with regards to a specific loss item using this class? Is it possible to calculate a gradient with regards to bounding box loss or objectness loss?
from yolov5.
Hello! π
Great to hear you've made progress with calculating gradients! To calculate gradients with respect to specific loss components (e.g., bounding box loss or objectness loss) using the ComputeLoss
class from Ultralytics, you can adjust your approach slightly. The ComputeLoss
function returns several individual loss components, which you can use to compute gradients for specific losses. Here's how you could do it:
# Assuming you've already initialized your model and input as shown in your code
# Forward pass
pred = model(input)
# Initialize the ComputeLoss class
compute_loss = ComputeLoss(model.model)
# Compute losses
loss, loss_items = compute_loss(pred[1], targets.to(device))
# loss_items is a tuple containing different loss components
# (box_loss, obj_loss, class_loss, ...)
# For example, to compute gradients for box_loss:
box_loss = loss_items[0]
box_loss.backward() # Backward pass for box loss
# Access gradients with respect to box loss
gradients = input.grad.data
# Make sure to zero the gradients if you're doing multiple backward passes
input.grad = None # Reset gradients for the next computation
This approach lets you focus on a specific component of the loss function and compute gradients with respect to it. Remember to clear the gradients if you plan to calculate gradients for other loss components to avoid accumulating gradients from multiple backward passes.
Happy exploring with YOLOv5! π
from yolov5.
Thank you one more time for a quick response! I tried this approach and unfortunately the Β΄loss_itemsΒ΄ is a tensor without a gradient and I cant run a backward pass on its elements. Do you know if there is any way to get loss_items as a tensor with a gradient?
from yolov5.
Hi there! π
Ah, I see where the confusion lies. Since loss_items
itself doesn't hold gradients, to focus on specific parts of the loss with gradients, you'll have to manually reconstruct these components from the outputs and target, and then perform the backward pass on these components separately.
For example, if you're interested in the gradient with respect to the objectness loss, you would extract the relevant predictions and manually compute the objectness loss part, ensuring it's set up to retain gradients. This requires a deeper dive into how ComputeLoss
computes each component, and then applying the same operations on your side.
As a simplified illustration:
pred = model(input) # Forward pass
# Manually compute objectness loss component
# Note: This is a conceptual example. Replace with actual computation.
obj_loss_component = (pred[..., 4] - targets[..., 4])**2
obj_loss_component.mean().backward()
gradients = input.grad.data
The key here is to ensure the operation you perform is differentiable and mirrors how the loss is computed within ComputeLoss
. Given the complexity, this might require some tweaking and testing on your end.
Keep up the great work! π
from yolov5.
Related Issues (20)
- Training YoloV5n on a custom dataset, best.pt is bigger than yolov5n official size HOT 4
- Data Augmentation HOT 1
- about eval.py HOT 1
- Need advice for training a YOLOv5-obb model HOT 2
- Code doubts about the model in the detection process HOT 2
- predicting from 2D array HOT 2
- Same yolov5s training, but one over-fitting and one training is very good. HOT 2
- Hello, I have some questions about the YOLOv5 code. Could you please help me answer them? HOT 2
- Different results from train.py and val.py HOT 1
- How to change training input image size? HOT 8
- Cannot select specific coda device HOT 2
- Run yolov5 using tensor rt HOT 1
- Is it possible to add ShuffleNetV2 as backbone in the official repo? HOT 2
- Memory Error When Training YOLOv5 Using Git Bash HOT 4
- How to use tensor rt in yolov5 detection HOT 1
- resume_evolve BUG!!! HOT 3
- Classification training model error HOT 2
- How do Yolo target assignments to anchors work? HOT 3
- roc curve HOT 5
- Confusion Matrix wrong output HOT 2
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
π Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. πππ
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google β€οΈ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from yolov5.