How to Fine-Tune and Deploy a Satellite-Specific LLMs Model for Satellite Images

ArXiv: Good at captioning, bad at counting: Benchmarking gpt-4v on earth observation data. arXiv:2401.17600.
You can view the presentation slides for the talk 🌎 here.

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.

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.

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 applications—such as chatbots, virtual assistants, content generation, and automated summarization—are 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:

  1. Data Preparation: Collect and preprocess large text corpora.
  2. Model Initialization: Start with a pre-trained model or initialize from scratch.
  3. 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, “Good at Captioning, Bad at Counting: Benchmarking GPT-4V on Earth Observation Data” (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.

The paper highlights several challenges and areas for future work. One major challenge is detecting data contamination, which is crucial for maintaining the fairness and effectiveness of benchmarks as VLMs evolve. Additionally, a more detailed analysis of model failures—such as knowledge gaps, reasoning errors, perceptual mistakes, and text misunderstandings—could provide deeper insights into current VLM capabilities. Zhang and Wang also note the static nature of benchmarks as a limitation, suggesting that dynamic updates may be necessary to keep benchmarks relevant and challenging as VLMs advance.

These findings offer valuable insights into GPT-4V’s capabilities and limitations, especially in the context of earth observation data.

Earth observation data

Fig. 1. Here are examples of inputs and outputs from various benchmark tasks and how five different VLMs stack up. They’ve 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, it’s 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 features—such as differentiating between natural landmarks, infrastructure, and potential environmental changes—can have far-reaching applications in fields like agriculture, urban planning, and disaster response.

VLM Comparison for Benchmark Tasks

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 tasks—offering detailed and sometimes creative descriptions—they 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 I’ve 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 and 2: Landmark Recognition Accuracy and Refusal Rate

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, there’s 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, I’ve 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-4V’s 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.

Architectural Landmark Identification

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.

Misidentification of Nebraska State Capitol

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.

Correct Identification but Weak Reasoning

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.

Airport Caption Generation

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.

Object Localization in DIOR-RSVG Dataset

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-4V’s performance is promising, but it still leaves room for improvement, especially in recognizing more subtle changes or those happening over time.

Change Detection in xView2 Dataset

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:

  1. Data Preparation
  2. Model Selection
  3. Fine-Tuning Paradigm
  4. Model Validation and Evaluation
  5. 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:

  1. Collect Satellite Images: Obtain satellite images from sources such as commercial providers or public datasets (e.g., Sentinel, Landsat).

  2. Annotate Images: Label images with relevant information (e.g., land cover types, objects of interest).

  3. Preprocess Images: Resize and normalize images to match the input requirements of the Vision Transformer (ViT) model.

  4. 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:

  1. Combine Models: Integrate ViT for image feature extraction and GPT for text generation.

  2. Define Loss Functions: Use suitable loss functions for image and text components.

  3. 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:

  1. Validation Set: Use a separate dataset to validate the model’s performance during training.

  2. 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:

  1. Export the Model: Save the fine-tuned model and tokenizer.

  2. Upload to Hugging Face: Use the transformers library to push the model to the Hugging Face Hub.

  3. 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:

  1. Input: Satellite Image + Textual Description
  2. Image Processing: ViT processes image into feature vectors.
  3. Text Generation: GPT-2 generates textual descriptions from image features.
  4. 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

  1. Load a pre-trained model.
  2. Freeze initial layers and fine-tune top layers.
  3. 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

  1. 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.

  2. F1 Score:

    • F1 Score is the harmonic mean of precision and recall, providing a single metric that balances both.

    Key Equation

    $[ \text{F1} = 2 \cdot \frac{\text{Precision} \cdot \text{Recall}}{\text{Precision} + \text{Recall}} ]$

  3. 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.

  4. 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

  1. Attention Visualization: Shows which parts of the input data are focused on by the model.
  2. Grad-CAM: Generates heatmaps highlighting important regions in the satellite images.
  3. 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/"}
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References

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Teerapong Panboonyuen
Teerapong Panboonyuen

My research focuses on leveraging advanced machine intelligence techniques, specifically computer vision, to enhance semantic understanding, learning representations, visual recognition, and geospatial data interpretation.