How to Fine-Tune and Deploy a Satellite-Specific LLMs Model for Satellite Images
Introduction to Large Language Models (LLMs)
Large Language Models (LLMs) are at the forefront of a revolution in Artificial Intelligence (AI) and Natural Language Processing (NLP). These models are not just sophisticated algorithms; they represent a leap forward in how machines understand and generate human language. Leveraging cutting-edge deep learning architectures, such as transformers, LLMs have transformed the landscape of language technology.
We're releasing a preview of OpenAI o1âa new series of AI models designed to spend more time thinking before they respond.
— OpenAI (@OpenAI) September 12, 2024
These models can reason through complex tasks and solve harder problems than previous models in science, coding, and math. https://t.co/peKzzKX1bu
At their essence, LLMs are built on expansive neural networks with billions of parameters. These networks are trained on vast corpora of text data, learning to discern intricate patterns and relationships within language. Through a process known as pre-training, LLMs develop a broad understanding of linguistic structures, context, and semantics. During this phase, they utilize unsupervised learning techniques to predict masked words or sequences, refining their ability to understand and generate coherent text.
Curious about fine-tuning a satellite-specific LLM model? đ
— Kao Panboonyuen (@kaopanboonyuen) September 10, 2024
.
Dive into my latest blog to learn more: https://t.co/sd25ByzQpJ
.#LLM #Geoscience #SatelliteLLM #AI #MachineLearning #Landsat #geography
Following pre-training, LLMs undergo fine-tuning to adapt their general language capabilities to specific tasks or domains. This supervised learning phase involves training the model on a targeted dataset, allowing it to excel in applications such as text generation, translation, sentiment analysis, and question-answering. Techniques like transfer learning and few-shot learning further enhance the model’s adaptability, enabling it to generalize from limited examples and perform across various contexts.
Deploying LLMs in real-world scenarios involves addressing practical challenges related to computational resources and scalability. These models require substantial processing power and memory, often necessitating the use of advanced hardware like GPUs or TPUs. Despite these demands, the benefits of integrating LLMs into applicationsâsuch as chatbots, virtual assistants, content generation, and automated summarizationâare profound, offering significant advancements in how machines interact with human language.
In this blog post, I will delve into the technical intricacies of LLMs, exploring their architecture, training methodologies, and deployment considerations. Prepare to discover how these powerful AI tools are pushing the boundaries of language technology and shaping the future of machine intelligence.
Key Vocabulary
Here are some essential terms and acronyms related to LLMs:
Acronym | Meaning |
---|---|
AI | Artificial Intelligence: The simulation of human intelligence in machines that are programmed to think and learn. |
ANN | Artificial Neural Network: A computational model inspired by biological neural networks. |
BERT | Bidirectional Encoder Representations from Transformers: A model for natural language understanding tasks. |
CNN | Convolutional Neural Network: Effective for processing grid-like data such as images. |
CRF | Conditional Random Field: A statistical modeling method for structured prediction. |
DNN | Deep Neural Network: A neural network with multiple layers. |
DL | Deep Learning: A subset of machine learning with neural networks containing many layers. |
GPT | Generative Pre-trained Transformer: A transformer-based model for generating human-like text. |
HMM | Hidden Markov Model: A model for systems that transition between states with certain probabilities. |
LSTM | Long Short-Term Memory: A type of RNN designed to remember long-term dependencies. |
LLM | Large Language Model: Trained on vast amounts of text data to understand and generate text. |
ML | Machine Learning: Training algorithms to make predictions based on data. |
NLP | Natural Language Processing: The interaction between computers and human language. |
RAG | Retrieval-Augmented Generation: Combines document retrieval with generative models. |
RNN | Recurrent Neural Network: Designed for sequential data. |
T5 | Text-to-Text Transfer Transformer: Converts various tasks into a text-to-text format. |
Transformer | A model architecture that uses self-attention mechanisms. |
ViT | Vision Transformer: A transformer model for image processing. |
VQA | Visual Question Answering: Combining vision and language understanding. |
VLMs | Vision-Language Models: Close the divide between visual and language comprehension in AI. |
XLNet | An extension of BERT with permutation-based training. |
Hugging Face | Platform for NLP with pre-trained models, datasets, and tools. |
Transformers | Library for transformer-based models by Hugging Face. |
datasets | Library for managing datasets, by Hugging Face. |
Gradio | Library for creating machine learning demos with simple UIs. |
LangChain | Facilitates development using LLMs with tools for managing language-based tasks. |
spaCy | Advanced NLP library in Python. |
NLTK | Natural Language Toolkit: Tools for text processing and linguistic analysis. |
StanfordNLP | Library by Stanford University for NLP tasks. |
OpenCV | Library for computer vision tasks. |
PyTorch | Deep learning framework with tensor computations and automatic differentiation. |
TensorFlow | Framework for building and deploying machine learning models. |
Keras | High-level neural networks API running on top of TensorFlow. |
Fastai | Simplifies neural network training with PyTorch. |
ONNX | Open Neural Network Exchange format for model transfer between frameworks. |
Architecture of LLMs
LLMs are built on advanced architectures that often include transformer models. A transformer model utilizes self-attention mechanisms to process input sequences. The core components of a transformer are:
- Encoder: Processes the input data.
- Decoder: Generates the output sequence.
Transformer Architecture Formula
The key mathematical operation in transformers is the self-attention mechanism, which can be described as follows:
$[ \text{Attention}(Q, K, V) = \text{softmax}\left(\frac{QK^T}{\sqrt{d_k}}\right)V ]$
where:
- $( Q )$ is the query matrix,
- $( K )$ is the key matrix,
- $( V )$ is the value matrix,
- $( d_k )$ is the dimensionality of the keys.
Training LLMs
Training LLMs involves several steps:
- Data Preparation: Collect and preprocess large text corpora.
- Model Initialization: Start with a pre-trained model or initialize from scratch.
- Training: Use gradient descent and backpropagation to minimize the loss function.
Introduction to LLMs for Satellite Images
Fine-tuning a Large Language Model (LLM) like SatGPT for satellite imagery involves several critical stages. This process transforms a pre-trained model into a specialized tool capable of analyzing and generating insights from satellite images. This blog post provides a step-by-step guide to fine-tuning and deploying SatGPT, covering each phase in detail.
In their 2024 paper, âGood at Captioning, Bad at Counting: Benchmarking GPT-4V on Earth Observation Dataâ (arXiv:2401.17600), Zhang and Wang focus on developing a benchmark for Vision-Language Models (VLMs) applied to Earth Observation (EO) data. Their initial framework addresses three main areas: scene understanding, localization and counting, and change detection. To assess VLM performance across these areas, they design evaluations that span various applications, from wildlife conservation to urban monitoring, as illustrated in Figure 1. Their goals are to evaluate existing VLMs, provide insights into effective prompting techniques for EO tasks, and establish a flexible system for ongoing benchmark updates and future VLM evaluations.
#SatGPT is an app that lets you talk to satellite imagery.
— Kevin Lalli (@opticsinspace) June 19, 2023
We've got some more work to do before it's polished, but I'm pretty psyched about the results so far.
Powered by @Element84 @STACspec @LangChainAI @Panel_org @HoloViz_org, huge thanks to @ivanziogeo & @MarcSkovMadsen. pic.twitter.com/gO7aZz6w4C
These findings offer valuable insights into GPT-4Vâs capabilities and limitations, especially in the context of earth observation data.
Fig. 1. Here are examples of inputs and outputs from various benchmark tasks and how five different VLMs stack up. Theyâve included just a snippet of the user prompts and model responses to highlight the key points. [Good at captioning, bad at counting]
Exploring Vision-Language Models (VLMs) to Understand High-Level Features in Remotely Sensed Images
In my recent work, I’ve been diving deep into Vision-Language Models (VLMs) to see how well they perform in tasks that require understanding both visual and textual data. With the explosion of AI models that can interpret images and generate coherent, detailed text, itâs become increasingly important to assess these models not just on general benchmarks, but in specific, high-stakes domains like remotely sensed imagery.
Remotely sensed images, which are collected from satellite or aerial platforms, provide a unique challenge for VLMs. They are dense with data, full of patterns, and often contain complex interactions between natural and man-made objects. The ability of a model to not only caption these images but also understand high-level featuresâsuch as differentiating between natural landmarks, infrastructure, and potential environmental changesâcan have far-reaching applications in fields like agriculture, urban planning, and disaster response.
Fig. 2. A comparison of inputs and outputs from benchmark tasks using different VLMs. The snippet includes user prompts and model responses, highlighting key areas of model performance. [Good at captioning, bad at counting]
What Makes Vision-Language Models (VLMs) Special?
VLMs operate at the intersection of vision and language, giving them the ability to describe images with textual explanations. This makes them incredibly useful for analyzing and interpreting remote sensing data. In these images, VLMs can recognize patterns, identify important landmarks, and even offer insights into the features present within the scene.
However, while these models excel at captioning tasksâoffering detailed and sometimes creative descriptionsâthey can struggle with more precise tasks like counting objects or recognizing certain functional categories. This is a critical gap that must be addressed, especially in applications where accuracy is paramount.
Challenges in Remote Sensing with VLMs
One of the major challenges Iâve observed while working with VLMs on remotely sensed images is the models’ difficulty in consistently recognizing high-level features, especially when dealing with complex or less common landmarks. This can lead to a high rate of refusal or incorrect identification in certain categories.
For instance, a model might easily recognize a natural park or large urban feature, but struggle to identify a specific sports venue or government building. These variances are especially pronounced when analyzing remote imagery, where the perspective and scale can make recognition even more difficult.
Benchmarking VLMs on Landmark Recognition
I ran some experiments using five different VLMs (GPT-4V, InstructBLIP-TS-XXL, InstructBLIP-Vicuna-13b, LLaVA-v1.5, Qwen-VL-Chat) to see how well they could identify landmarks in a set of remotely sensed images. Below is the summary of the results for landmark recognition accuracy (Table 1) and refusal rate (Table 2).
Table 1: Landmark recognition accuracy by functional category and Table 2: Landmark recognition refusal rate. [Good at captioning, bad at counting]
As you can see, there are significant variances in how different models perform across these categories. GPT-4V and InstructBLIP tend to outperform other models in recognizing large, prominent landmarks like natural parks and urban infrastructure. However, thereâs still considerable room for improvement, especially when identifying more specific or niche features, like places of worship or government buildings.
Diving Deeper into VLMs: Case Studies of Landmark Recognition and Scene Interpretation
The nuances of how Vision-Language Models (VLMs) understand and interpret images can be observed more clearly in specific examples. Below, Iâve analyzed a few key scenarios where GPT-4V has demonstrated both its strengths and limitations.
Visual Recognition with Architectural Context
One fascinating case is GPT-4Vâs ability to link visual cues with its knowledge of architecture. In Figure 3, the model successfully identifies a landmark by connecting the architectural style with its vast knowledge base, arriving at the correct answer. This demonstrates its ability to use contextual clues beyond just object recognition.
Fig. 3. GPT-4V successfully corresponds visual cues with its knowledge about the architectural style of the landmark to arrive at the correct answer. [Good at captioning, bad at counting]
The Problem of Visual Misinterpretation
However, VLMs aren’t infallible. One case where GPT-4V struggled is in the identification of the Nebraska State Capitol. In Figure 4, the model incorrectly eliminates the correct answer due to misidentifying the tower-like structure. This reveals a significant gap in its ability to distinguish more subtle architectural details, leading to incorrect conclusions.
Fig. 4. GPT-4V fails to identify the tower-like structure of the Nebraska State Capitol, leading to incorrect elimination. [Good at captioning, bad at counting]
Correct Identification but Weak Justifications
Interestingly, even when GPT-4V identifies a landmark correctly, it sometimes provides insufficient reasoning. In Figure 5, the model identifies the landmark, but the reasoning lacks depth, which could be a hindrance in scenarios requiring detailed explanations, such as educational or research-oriented applications.
Fig. 5. GPT-4V correctly identifies the landmark but gives insufficient reasoning. [Good at captioning, bad at counting]
Generating Image Captions for Complex Scenes
Another interesting scenario is when the model is tasked with generating captions for complex images. In Figure 6, GPT-4V generates several captions for an airport image. While the captions are coherent, they sometimes miss finer details, like the specific types of airplanes or terminal features, which could be crucial in more technical applications like surveillance or logistics planning.
Fig. 6. Example captions generated for an airport image. [Good at captioning, bad at counting]
Object Localization in Remote Sensing
Object localization is another key area where VLMs need to perform exceptionally well. In Figure 7, GPT-4V is tasked with localizing objects in a DIOR-RSVG dataset image. While it performs reasonably well, there are still challenges in precisely identifying and categorizing certain objects, especially in cluttered or low-contrast scenes.
Fig. 7. Example prompt and response for DIOR-RSVG object localization. [Good at captioning, bad at counting]
Detecting Changes in xView2 Imagery
Finally, in Figure 8, the model is put to the test with change detection using the xView2 dataset, where it must identify changes in infrastructure and the environment. This kind of task is essential in applications like disaster response or urban monitoring, where rapid and accurate assessments can make a significant difference. GPT-4Vâs performance is promising, but it still leaves room for improvement, especially in recognizing more subtle changes or those happening over time.
Fig. 8. Example prompt and response for xView2 change detection. [Good at captioning, bad at counting]
Overview of the Fine-Tuning Process
The process of fine-tuning and deploying a satellite-specific LLM model involves the following stages:
- Data Preparation
- Model Selection
- Fine-Tuning Paradigm
- Model Validation and Evaluation
- Export and Deployment to Hugging Face
Step-by-Step Fine-Tuning of SatGPT for Satellite Imagery
1. Data Preparation
Objective: Collect, preprocess, and format satellite images and associated textual annotations.
Steps:
-
Collect Satellite Images: Obtain satellite images from sources such as commercial providers or public datasets (e.g., Sentinel, Landsat).
-
Annotate Images: Label images with relevant information (e.g., land cover types, objects of interest).
-
Preprocess Images: Resize and normalize images to match the input requirements of the Vision Transformer (ViT) model.
-
Prepare Textual Descriptions: Generate textual descriptions or annotations for each image, which will be used for training the text generation component.
Example:
from transformers import ViTFeatureExtractor, GPT2Tokenizer
# Initialize feature extractor and tokenizer
feature_extractor = ViTFeatureExtractor.from_pretrained('google/vit-base-patch16-224-in21k')
tokenizer = GPT2Tokenizer.from_pretrained('gpt2')
# Sample image and text
image = ... # Load satellite image
text = "This is a description of the satellite image."
# Prepare inputs
inputs = feature_extractor(images=image, return_tensors="pt")
labels = tokenizer(text, return_tensors="pt").input_ids
2. Model Selection
Objective: Choose an appropriate pre-trained model as the foundation for SatGPT.
Options:
- Vision Transformer (ViT): For processing and extracting features from satellite images.
- GPT-2 or GPT-3: For generating textual descriptions or insights based on image features.
Example:
from transformers import GPT2LMHeadModel, ViTModel
# Load pre-trained models
image_model = ViTModel.from_pretrained('google/vit-base-patch16-224-in21k')
text_model = GPT2LMHeadModel.from_pretrained('gpt2')
3. Fine-Tuning Paradigm
Objective: Adapt the selected models to work together for the specific task of analyzing satellite imagery.
Steps:
-
Combine Models: Integrate ViT for image feature extraction and GPT for text generation.
-
Define Loss Functions: Use suitable loss functions for image and text components.
-
Training Loop: Implement a training loop to update model parameters based on the image-text pairs.
Example:
from transformers import Trainer, TrainingArguments
# Define training arguments
training_args = TrainingArguments(
output_dir='./results',
num_train_epochs=3,
per_device_train_batch_size=4,
logging_dir='./logs',
)
# Initialize Trainer
trainer = Trainer(
model=image_model, # This would be a combined model in practice
args=training_args,
train_dataset=train_dataset, # Prepare your dataset
)
# Train the model
trainer.train()
4. Model Validation and Evaluation
Objective: Assess the performance of the fine-tuned model to ensure it meets the desired criteria.
Steps:
-
Validation Set: Use a separate dataset to validate the modelâs performance during training.
-
Evaluation Metrics: Measure performance using metrics such as accuracy, F1 score, or BLEU score (for text generation).
Example:
# Evaluate the model
eval_results = trainer.evaluate()
print(eval_results)
5. Export and Deployment to Hugging Face
Objective: Make the fine-tuned model available for inference and integration through Hugging Face.
Steps:
-
Export the Model: Save the fine-tuned model and tokenizer.
-
Upload to Hugging Face: Use the
transformers
library to push the model to the Hugging Face Hub. -
Create an Inference Endpoint: Deploy the model and set up an API endpoint for user interactions.
Example:
from transformers import pipeline
# Load model from Hugging Face Hub
nlp = pipeline("text-generation", model="username/satgpt-model")
# Use the model
result = nlp("Describe the land cover of this GISTDA satellite image.")
print(result)
Additional Concepts
- Retrieval-Augmented Generation (RAG): Combines document retrieval with generative models to improve response accuracy.
- Vision Transformers (ViT): Adapt transformers for image processing by treating images as sequences of patches.
Formula for Self-Attention in RAG
In RAG, the attention mechanism can be described as:
$[ \text{RAG}(Q, K, V, D) = \text{Attention}(Q, K, V) + \text{Retrieval}(D) ]$
where $( D )$ represents retrieved documents.
Vision Transformer (ViT)
The Vision Transformer treats images as sequences of patches and processes them with transformer architectures. The key operation in ViT involves:
$[ \text{Patch Embedding}(I) = \text{Linear}(I) + \text{Positional Encoding} ]$
where $( I )$ is the image and the output is a sequence of patch embeddings.
Full Flow Diagram
Here’s a conceptual flow of how data is processed through SatGPT, from input to output:
- Input: Satellite Image + Textual Description
- Image Processing: ViT processes image into feature vectors.
- Text Generation: GPT-2 generates textual descriptions from image features.
- Output: Generated Text
Quick thoughts on LLMs before we wrap up this blog:
1. Introduction to Large Language Models (LLMs) in Remote Sensing
Large Language Models (LLMs) are advanced models designed to understand and generate human-like text. They can be adapted for analyzing satellite imagery by combining multimodal inputs, like images and textual descriptions.
Key Equations
The underlying architecture for LLMs is based on the Transformer model, which is governed by: $[ \mathbf{Z} = \text{softmax}\left(\frac{\mathbf{QK}^\top}{\sqrt{d_k}}\right)\mathbf{V} ]$ where $\mathbf{Q}, \mathbf{K}, \mathbf{V}$ are query, key, and value matrices respectively.
2. Foundation Models and Their Role in LLMs
Foundation models are pre-trained on extensive datasets and serve as the base for fine-tuning on specific tasks, such as satellite image analysis.
Key Equations
The objective during pre-training is to minimize: $[ MLM = - \sum_{i=1}^{N} \log P(x_i | x_{-i}; \theta) ]$ where ${MLM}$ is the masked language modeling loss.
3. Training vs Fine-tuning vs Pre-trained Models in LLMs
- Pre-trained Models: Trained on large-scale datasets.
- Fine-tuning: Adapting a pre-trained model to a specific task or dataset.
- Training: Training a model from scratch using a domain-specific dataset.
Key Equations
Cross-entropy loss function used during fine-tuning: $[ \mathcal{L} = - \sum_{i=1}^{N} y_i \log(\hat{y}_i) ]$
4. How to Train LLMs on Satellite Images
Training LLMs on satellite images involves using multimodal inputs and embeddings to represent both images and textual descriptions.
5. Retrieval-Augmented Generation (RAG) for Satellite Image Analysis
RAG combines document retrieval with generation capabilities to enhance satellite image analysis by incorporating additional contextual information.
Key Equations
RAG combines retrieval and generation via: $[ P(x|c) = \sum_{i} P(x | c_i, q)P(c_i | q) ]$
6. Using LangChain for Satellite Image LLM Applications
LangChain facilitates chaining LLMs together for various tasks, such as preprocessing, analysis, and post-processing of satellite images.
Example
Using LangChain to preprocess satellite metadata:
from langchain import SimplePromptTemplate
template = SimplePromptTemplate(prompt="Summarize satellite data: {data}")
summary = template.run(data=satellite_metadata)
7. Sample Datasets for LLM Fine-Tuning in Remote Sensing
Datasets such as UC Merced Land Use, EuroSAT, and BigEarthNet are used for fine-tuning LLMs to handle specific satellite image tasks.
8. Mathematical Foundations of Attention Mechanisms in LLMs
The attention mechanism in LLMs is crucial for focusing on specific parts of the input data, such as regions in a satellite image.
Key Equations
Self-attention mechanism: $[ \text{Attention}(Q, K, V) = \text{softmax}\left(\frac{QK^\top}{\sqrt{d_k}}\right)V ]$
9. Multimodal LLM Architectures for Satellite Images
Multimodal LLMs integrate both text and image data, allowing for comprehensive analysis of satellite imagery.
Key Equations
For multimodal learning, image and text representations are combined: $[ \mathbf{Z} = \text{Concat}(Z_{\text{img}}, Z_{\text{text}}) ]$
10. Preprocessing Techniques for Satellite Images in LLMs
Preprocessing techniques like normalization and histogram equalization are essential for preparing satellite images for analysis.
Key Formulas
Image normalization: $[ X’ = \frac{X - \mu}{\sigma} ]$ where $X$ is the pixel value, $\mu$ is the mean, and $\sigma$ is the standard deviation.
11. Handling Illumination and Atmospheric Effects in LLMs
Illumination and atmospheric distortions can affect satellite images, and models must be trained to handle these variations.
Key Equations
Illumination adjustment formula: $[ I’ = \frac{I}{\cos(\theta) + \epsilon} ]$ where $\theta$ is the solar zenith angle.
12. Self-Supervised Learning (SSL) for Satellite Image Analysis
SSL techniques allow models to learn from unlabelled satellite data by setting up proxy tasks such as predicting missing data.
13. Open-Source Tools for LLMs in Satellite Image Analysis
Useful tools include Hugging Face Transformers for fine-tuning, LangChain for chaining models, and FastAI for data augmentation.
Example Code
Using Hugging Face Transformers:
from transformers import BertTokenizer, BertModel
tokenizer = BertTokenizer.from_pretrained("bert-base-uncased")
model = BertModel.from_pretrained("bert-base-uncased")
14. Fine-Tuning LLMs for Specific Satellite Image Tasks
Fine-tuning involves adjusting a pre-trained model using satellite data to improve performance on specific tasks.
Key Steps
- Load a pre-trained model.
- Freeze initial layers and fine-tune top layers.
- Train with domain-specific data.
15. Evaluation Metrics for LLMs in Remote Sensing
Evaluating the performance of Large Language Models (LLMs) in remote sensing involves several metrics, including precision, recall, F1 score, mean Average Precision (mAP), and BLEU score. These metrics help assess the quality of predictions and the relevance of generated content.
Key Metrics
-
Precision and Recall:
- Precision measures the proportion of true positive results among all positive results predicted by the model.
- Recall measures the proportion of true positive results among all actual positive results.
Key Equations
Precision: $[ \text{Precision} = \frac{TP}{TP + FP} ]$ Recall: $[ \text{Recall} = \frac{TP}{TP + FN} ]$ where $TP$ is true positives, $FP$ is false positives, and $FN$ is false negatives.
-
F1 Score:
- F1 Score is the harmonic mean of precision and recall, providing a single metric that balances both.
Key Equation
$[ \text{F1} = 2 \cdot \frac{\text{Precision} \cdot \text{Recall}}{\text{Precision} + \text{Recall}} ]$
-
mean Average Precision (mAP):
- mAP evaluates the precision of object detection models, averaging the precision across different recall levels.
Key Equation
Average Precision (AP) for a single class: $[ \text{AP} = \int_{0}^{1} \text{Precision}(r) , \text{Recall}(r) ]$ where $\text{Precision}(r)$ is the precision at recall level $r$.
mAP is the mean of AP across all classes: $[ \text{mAP} = \frac{1}{C} \sum_{i=1}^{C} \text{AP}_i ]$ where $C$ is the number of classes.
-
BLEU Score:
- BLEU Score evaluates the quality of generated text by comparing it to reference texts, commonly used for tasks like image captioning.
Key Equation
BLEU score is calculated using n-gram precision: $[ \text{BLEU} = \text{exp}\left(\sum_{n=1}^{N} w_n \cdot \log P_n\right) ]$ where $P_n$ is the precision of n-grams, and $w_n$ is the weight for n-grams of length $n$.
Example Code
from sklearn.metrics import precision_score, recall_score, f1_score
from sklearn.metrics import average_precision_score, precision_recall_curve
from nltk.translate.bleu_score import sentence_bleu
# Example for precision, recall, F1 score
y_true = [0, 1, 1, 0, 1, 1, 0]
y_pred = [0, 1, 0, 0, 1, 1, 1]
precision = precision_score(y_true, y_pred)
recall = recall_score(y_true, y_pred)
f1 = f1_score(y_true, y_pred)
# Example for BLEU score
reference = [['GISTDA', 'is', 'the', 'premier', 'place', 'to', 'work', 'in', 'the', 'geo', 'sector', 'in', 'thailand']]
candidate = ['GISTDA', 'is', 'the', 'best', 'workplace', 'in', 'geo', 'in', 'thailand']
bleu_score = sentence_bleu(reference, candidate)
print(f"Precision: {precision}")
print(f"Recall: {recall}")
print(f"F1 Score: {f1}")
print(f"BLEU Score: {bleu_score}")
16. Transfer Learning for Satellite Imagery
Transfer learning uses models pre-trained on general datasets and adapts them for satellite image tasks through domain-specific fine-tuning.
Example Code
Using pre-trained ResNet for satellite image classification:
from torchvision import models
resnet = models.resnet50(pretrained=True)
# Freeze general layers
for param in resnet.parameters():
param.requires_grad = False
# Fine-tune top layers
resnet.fc = nn.Linear(in_features=2048, out_features=num_classes)
17. Explainability in LLMs for Remote Sensing (XAI)
Explainable AI (XAI) methods enhance the transparency of LLM predictions, allowing users to understand how models make decisions based on satellite imagery.
Key Techniques
- Attention Visualization: Shows which parts of the input data are focused on by the model.
- Grad-CAM: Generates heatmaps highlighting important regions in the satellite images.
- SHAP: Explains individual predictions by computing feature contributions.
Key Equations
Grad-CAM heatmap formula: $[ \text{Grad-CAM}(A^k) = \text{ReLU}\left( \sum_k \alpha_k A^k \right) ]$ where $\alpha_k$ is the gradient of the loss with respect to the feature map $A^k$.
Example Code
Using Grad-CAM for explainability:
import torch
import cv2
import numpy as np
# Compute gradients
def grad_cam(model, img):
gradients = torch.autograd.grad(outputs=model(img), inputs=model.layer4)
weights = torch.mean(gradients[0], dim=[2, 3], keepdim=True)
cam = torch.sum(weights * model.layer4(img), dim=1)
return cam
# Apply Grad-CAM on an image
cam_output = grad_cam(resnet, satellite_image)
Conclusion
In conclusion, large language models (LLMs) are making impressive strides in the realm of satellite data analysis, showcasing their potential across scene understanding, localization, counting, and change detection. These models are beginning to transform how we interpret complex satellite imagery, offering valuable insights for everything from environmental monitoring to urban development.
Despite these advancements, challenges remain. Current benchmarks reveal that while LLMs excel in tasks like generating descriptive captions and recognizing landmarks, they sometimes fall short in areas requiring detailed object counting and nuanced change detection. This highlights the need for more refined evaluation methods to fully capture and enhance LLM capabilities.
As both satellite technology and LLMs continue to evolve, the path forward promises exciting developments. By refining benchmarks and exploring new methodologies, we can unlock even greater potential in this technology.
I hope you enjoyed this deep dive into the intersection of LLMs and satellite data. If you found this blog insightful, please consider sharing it with others who might be interested. Stay tuned for more updates and innovations in this thrilling field!
Citation
Panboonyuen, Teerapong. (Sep 2024). How to Fine-Tune and Deploy a Satellite-Specific LLM Model for Satellite Images. Blog post on Kao Panboonyuen. https://kaopanboonyuen.github.io/blog/2024-09-09-how-to-fine-tune-and-deploy-a-satellite-specific-llm-model/
For a BibTeX citation:
@article{panboonyuen2024finetune,
title = "How to Fine-Tune and Deploy a Satellite-Specific LLM Model for Satellite Images",
author = "Panboonyuen, Teerapong",
journal = "kaopanboonyuen.github.io/",
year = "2024",
month = "Sep",
url = "https://kaopanboonyuen.github.io/blog/2024-09-09-how-to-fine-tune-and-deploy-a-satellite-specific-llm-model/"}
References
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