How To Implement Document Classification In Python [8 Machine Learning & Deep Learning Models]

by | Oct 23, 2023 | Data Science, Machine Learning, Natural Language Processing

Basics of Document Classification

Document classification, or document categorization, is a fundamental natural language processing (NLP) task that categorizes text documents into predefined categories or labels. In this section, we will explore document classification’s foundational concepts and significance and provide real-world examples and use cases to illustrate its practical importance.

What is Document Classification?

Document or text categorization assigns a label or category to a text document based on its content. This label is selected from a predefined set of categories, making it easier to organize and manage large volumes of textual data. Each document is associated with the category that best represents its subject matter or content.

Document or text categorization assigns a label or category to a text document based on its content

Document classification automates and streamlines various tasks, including content organization, information retrieval, and filtering. By classifying documents, you can quickly find relevant information, identify patterns, and make informed decisions based on the content’s category.

What Is Document Classification Used For?

Document classification plays a crucial role in numerous real-world applications and has several benefits:

  1. Information Retrieval: Document classification enhances the efficiency of information retrieval systems. It allows users to locate specific documents or articles more efficiently in digital libraries, search engines, or content management systems.
  2. Content Organization: Classification helps in structuring and organizing textual data. For instance, a news website may use document classification to categorize articles into topics such as politics, sports, or technology, making it easier for readers to find content of interest.
  3. Content Filtering: In the age of information overload, document classification is essential for content filtering. It enables the automatic identification of spam emails, inappropriate content on websites, or the categorization of social media posts for moderation.
  4. Recommendation Systems: E-commerce platforms and streaming services use document classification to recommend products or content to users based on their preferences. By classifying user behaviour and content, these systems offer personalized recommendations.

Real-World Examples and Use Cases

To better grasp the significance of document classification, consider these real-world examples:

  1. Spam Email Detection: Email providers use document classification to distinguish between legitimate emails and spam. Users are protected from unwanted and potentially harmful messages by classifying emails into “inbox” or “spam” categories.
  2. News Article Categorization: News websites employ document classification to organize articles into sections like politics, business, and entertainment. This helps users quickly find pieces that match their interests.
  3. Legal Document Categorization: In the legal field, document classification is used for categorizing and organizing legal documents, making e-discovery processes more efficient.
  4. Content Recommendation: Streaming platforms like Netflix use document classification to suggest movies and TV shows based on a user’s viewing history and preferences.
  5. Language Identification: Document classification is crucial for identifying the language of a text document, which is essential for multilingual content platforms and translation services.

Document classification simplifies managing and understanding large volumes of textual data by assigning documents to specific categories. This process underlies many practical applications, from enhancing search engines to improving content recommendations, and it continues to play a vital role in the digital age.

Getting Started With Data Preparation

Adequate data preparation is a critical first phase in the document classification process. This section will explore the key steps and considerations for preparing data before training a document classification model. Proper data preparation ensures the model can learn and generalize from the text documents effectively.

Collecting a Labeled Dataset

The foundation of document classification is a labelled dataset. This dataset consists of text documents associated with a predefined category or label. The process of collecting such a dataset involves the following:

  1. Data Sourcing: Identify and gather text documents covering the topics or categories you want to classify. This might involve web scraping, data extraction from databases, or using existing datasets.
  2. Labelling: Manually or automatically assign labels to the documents. For instance, if you have a spam email dataset, you would mark each email as “spam” or “not spam.”
  3. Balancing: Ensure that the dataset is balanced, meaning that each category has a sufficient number of documents for training. Imbalanced datasets can lead to biased models.

Data Cleaning and Preprocessing

Before feeding the data into a classification model, cleaning and preprocessing it is essential. Data cleaning and preprocessing steps typically include the following:

  1. Text Cleaning: Remove any noise from the text data, such as HTML tags, special characters, or non-textual elements.
  2. Lowercasing: Convert all text to lowercase to ensure consistency in text representations. This prevents the model from treating “cat” and “Cat” as different words.
  3. Tokenization: Split the text into words or subword units. Tokenization is crucial for representing text as numerical features.
  4. Stop Word Removal: Eliminate common words like “and,” “the,” and “in” that carry little meaning for document classification tasks.
  5. Stemming or Lemmatization: Reduce words to their root form to ensure that different inflexions of a word are treated as the same word (e.g., “running” and “ran” to “run”).

How Can You Handle Imbalanced Datasets?

Imbalanced datasets are standard in document classification, where some categories may have many more examples than others. To address this, consider techniques such as:

  1. Oversampling: Create additional copies of minority class samples to balance the dataset.
  2. Undersampling: Reduce the number of majority class samples to balance the dataset.
  3. Synthetic Data Generation: Use techniques like SMOTE (Synthetic Minority Over-sampling Technique) to generate synthetic examples for minority classes.
  4. Evaluation Metrics: Use appropriate metrics like F1-score, precision-recall, or ROC-AUC, which are more robust for imbalanced datasets than accuracy.

Text Feature Extraction Techniques

After data preprocessing, you need to convert the text data into numerical features that machine learning models can use. Standard text feature extraction techniques include:

  1. Bag of Words (BoW): Represent each document as a vector of word frequencies. Each word is a feature, and its frequency in the document is its value.
  2. Term Frequency-Inverse Document Frequency (TF-IDF): Weigh words based on their importance in a document relative to their significance in a corpus. It helps identify words that are discriminative for a category.
  3. Word Embeddings: This method utilizes pre-trained word vectors (e.g., Word2Vec, GloVe, fastText) to represent words and documents in a continuous vector space.

Data preparation sets the stage for effective document classification. By ensuring your data is clean, well-labelled, and properly transformed into numerical features, you lay the foundation for building robust classification models. In the following sections, we will explore the choice of machine learning and deep learning models and document classification’s training and evaluation phases.

Machine Learning Models for Document Classification

This section will explore using machine learning models in document classification. Machine learning provides a robust framework for automating assigning categories to text documents. We’ll cover the basics, standard algorithms, and considerations when choosing the suitable model for your document classification task.

Introduction to Machine Learning Models

Machine learning models are designed to learn patterns and relationships within data, making them well-suited for document classification. Here are the key concepts to understand:

  • Supervised Learning: Document classification is primarily a supervised learning task. It means the model learns from labelled examples where the text document and its associated category are provided during training.
  • Feature Vectors: Text data must be transformed into numerical feature vectors for input for machine learning models. This is typically achieved through techniques like Bag of Words (BoW), Term Frequency-Inverse Document Frequency (TF-IDF), or word embeddings.
  • Classification Algorithms: Machine learning models predict the category of a document by mapping its feature vector to one of the predefined categories. Common classification algorithms include Naive Bayes, Support Vector Machines (SVM), and Random Forest.

Top 4 Algorithms for Document Classification

Let’s explore some of the common machine learning algorithms used in document classification:

1. Naive Bayes:

  • Pros: Simple, efficient, and effective for text classification. Works well even with small datasets.
  • Cons: Assumes independence between features (words), which may not always hold in text data.

2. Support Vector Machines (SVM):

  • Pros: Effective for both linear and non-linear classification. Good at handling high-dimensional data like text.
  • Cons: It can be computationally expensive for large datasets.

3. Random Forest:

  • Pros: Ensemble of decision trees, providing good performance and the ability to capture complex patterns.
  • Cons: May overfit on small datasets if not carefully tuned.

4. Logistic Regression:

  • Pros: Simple and interpretable. Works well when the relationship between features and labels is approximately linear.
  • Cons: It may not capture complex, non-linear patterns as effectively as other models.

Choosing the Right Model

Selecting the appropriate machine learning model for your document classification task depends on several factors:

  • Nature of the Data: Consider whether the relationship between features and labels is linear or non-linear. For complex patterns, ensemble models like Random Forest might be more suitable.
  • Size of the Dataset: Small datasets can benefit from simpler models like Naive Bayes, while larger datasets can handle more complex models like SVM or deep learning.
  • Computational Resources: Deep learning models can achieve state-of-the-art results but may require substantial computational resources and large amounts of data.
  • Interpretability: Depending on the application, the interpretability of the model may be a consideration. Naive Bayes and logistic regression models are more interpretable than deep learning models.
  • Experimentation: It’s often beneficial to experiment with multiple models and assess their performance using appropriate evaluation metrics. Cross-validation can help identify the best-performing model for your specific task.
  • Ensemble Methods: Combining multiple models, such as using an ensemble of classifiers or stacking, can improve classification accuracy.

Model Evaluation and Tuning

After selecting a model, the following steps involve training, evaluation, and potential hyperparameter tuning:

  • Training the Model: Train the selected machine learning model on the labelled dataset. Ensure you have a separate validation set for tuning hyperparameters.
  • Evaluation Metrics: Use appropriate evaluation metrics for document classification, such as accuracy, precision, recall, F1-score, and confusion matrices. Be cautious about overfitting to the evaluation metric.
  • Hyperparameter Tuning: Experiment with different settings to find the best model configuration. Techniques like grid search or random search can help with this process.
  • Cross-Validation: Implement cross-validation to ensure the model’s performance is consistent and to mitigate the risk of overfitting.

Machine learning models are a powerful tool for document classification. Understanding the nature of your data, choosing the suitable algorithm, and diligently evaluating and fine-tuning your model will help you create an effective document classification system. However, as document classification tasks become more complex, deep learning models and techniques also play a significant role, which we will explore in the following section.

Deep Learning for Document Classification

This section delves into the world of deep learning for document classification. Deep learning models have revolutionized natural language processing tasks, including document classification. We’ll explore the basics of deep learning, various architectures, and their applications in classifying text documents.

Top 4 Neural Network Architectures for Text Classification

Several neural network architectures are commonly used for document classification:

1. Convolutional Neural Networks (CNNs):

  • Architecture: CNNs are traditionally used for image analysis but have been adapted for text classification. They use convolutional layers to extract local features from the text.
  • Applications: CNNs are suitable for tasks where local word arrangements or n-grams are essential, such as sentiment analysis and spam detection.

2. Recurrent Neural Networks (RNNs):

3. Long Short-Term Memory (LSTM) and Gated Recurrent Unit (GRU):

  • Variants of RNNs: LSTMs and GRUs are designed to address the vanishing gradient problem in traditional RNNs. They are well-suited for modelling longer-range dependencies in text data.

4. Transformer-Based Models:

  • Architecture: Transformers, like BERT and GPT, have become dominant in NLP. They use self-attention mechanisms to capture contextual information and relationships between words.
  • Applications: Transformers are state-of-the-art models for various NLP tasks, including document classification, question-answering, and language translation.

Transfer Learning with Pre-Trained Models

One of the significant advantages of deep learning models is the concept of transfer learning. In this approach, pre-trained models, trained on massive text corpora, are fine-tuned for specific document classification tasks. This technique offers several advantages:

  • Efficiency: Pre-trained models contain valuable knowledge about language and can be adapted to new tasks with less data and training time.
  • State-of-the-Art Performance: Pre-trained models, such as BERT and GPT, have achieved state-of-the-art performance on various NLP tasks, including document classification.
  • Contextual Understanding: These models capture rich contextual information, allowing them to understand nuances in text data.

Pros and Cons of Deep Learning in Document Classification

Pros:

  • State-of-the-Art Performance: Deep learning models, especially transformer-based models, have performed remarkably on document classification tasks.
  • Automatic Feature Learning: Deep learning models automatically learn features from data, reducing the need for manual feature engineering.
  • Handling Complex Relationships: Deep learning models can capture complex relationships in text, making them suitable for diverse document classification tasks.

Cons:

  • Data and Computation: Deep learning models often require large datasets and significant computational resources for training.
  • Interpretability: Some deep learning models, particularly those with many parameters, can be challenging to interpret.
  • Fine-Tuning Complexity: Fine-tuning pre-trained models for specific tasks can be intricate and may require expertise.

Deep learning has brought about significant advancements in document classification. By leveraging architectures like CNNs, RNNs, and transformer-based models, document classification systems can achieve state-of-the-art accuracy and handle complex textual data. Transfer learning with pre-trained models has become essential for efficiently applying deep learning to document classification tasks.

Step-by-step Guide To The Document Classification Process

In this section, we will outline the document classification process, which involves the steps from data preparation to model deployment. Understanding this process is crucial for successfully implementing document classification solutions.

1. Data Preparation

Data preparation is the initial step in the document classification process:

  • Data Collection: Gather a labelled dataset of text documents, ensuring each document is associated with a predefined category.
  • Data Cleaning and Preprocessing: Clean the text data by removing noise, lowercasing, tokenizing, removing stop words, and applying stemming or lemmatization.
  • Feature Extraction: Convert the text data into numerical feature vectors using techniques like Bag of Words (BoW), Term Frequency-Inverse Document Frequency (TF-IDF), or word embeddings.
  • Handling Imbalanced Data: Address any imbalances in the dataset through techniques like oversampling, undersampling, or using specialized evaluation metrics.

2. Model Selection

Choose the appropriate machine or deep learning model for your document classification task. Common choices include Naive Bayes, Support Vector Machines (SVM), convolutional neural networks (CNNs), recurrent neural networks (RNNs), and transformer-based models.

3. Training the Model

The training phase involves the following steps:

  • Data Split: Split the dataset into a training set and a testing/validation set to train and evaluate the model’s performance. Consider using techniques like k-fold cross-validation.
  • Model Training: Train the selected model on the training data. Fine-tune hyperparameters to optimize the model’s performance.

4. Model Evaluation

Assess the model’s performance using appropriate evaluation metrics. Common evaluation metrics for document classification include accuracy, precision, recall, F1-score, and confusion matrices. Consider the following steps:

  • Testing Set Evaluation: Evaluate the model on the testing or validation set to understand how well it generalizes to unseen data.
  • Hyperparameter Tuning: Fine-tune model hyperparameters based on evaluation results to achieve the best performance.
  • Bias and Fairness Evaluation: Check for potential biases or fairness issues in the model’s predictions, especially in sensitive data applications.

5. Model Deployment

Once you have a trained and validated model, it’s time to deploy it for practical use. Deployment can involve:

  • Integration: Integrate the model into an application, website, or system where it will be used for document classification.
  • Scalability: Ensure the deployed model can handle the expected volume of incoming documents.
  • Monitoring: Implement monitoring mechanisms to track the model’s performance over time, identify drift, and retrain it as needed.
  • User Feedback: Gather user feedback to continually improve the model and address any issues that arise in real-world usage.

6. Continuous Improvement

Document classification models benefit from continuous improvement:

  • Data Updates: Regularly update the model with new data to ensure it remains accurate and relevant.
  • Reevaluation: Periodically reassess the model’s performance and retrain it as needed to adapt to changing patterns in the data.
  • Active Learning: Implement active learning strategies to select the most informative documents for human labelling, reducing the need for manual labelling of large datasets.
  • Feedback Loop: Establish a feedback loop to incorporate user feedback and adapt the model to evolving user needs.

7. Handling Multiclass and Multilabel Classification

Consider the specific nature of your document classification task:

  • Multiclass vs. Binary Classification: Determine whether you perform binary classification (e.g., spam vs. not spam) or multiclass classification (categorizing into multiple categories or labels).
  • Multilabel Classification: If a document can belong to multiple categories simultaneously, it’s multilabel classification. Ensure your model is capable of handling this complexity.

The document classification process is iterative, and successful implementation often involves refining the model and its deployment based on real-world feedback and changing data patterns. Staying attuned to emerging techniques and continuously improving the model is essential for long-term success.

How To Implement Document Classification In Python

Implementing document classification in Python involves several steps, from data preparation to model training and evaluation. Here’s a step-by-step guide on how to implement document classification:

1. Data Collection and Preprocessing:

  • Gather a labelled dataset of text documents. You can use libraries like pandas to load and manipulate the data.
  • Preprocess the text data by removing noise, special characters, and unnecessary elements.
  • Tokenize the text into words or subword units.
  • Optionally, perform stemming or lemmatization to reduce words to their base forms.
import pandas as pd
from sklearn.model_selection import train_test_split
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.preprocessing import LabelEncoder

# Load data
data = pd.read_csv('your_dataset.csv')

# Data preprocessing
data['text'] = data['text'].apply(preprocess_text)

# Split data into training and testing sets
X = data['text']
y = data['category']
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)

# Vectorize the text data using TF-IDF
vectorizer = TfidfVectorizer(max_features=5000)
X_train = vectorizer.fit_transform(X_train)
X_test = vectorizer.transform(X_test)

# Encode labels
label_encoder = LabelEncoder()
y_train = label_encoder.fit_transform(y_train)
y_test = label_encoder.transform(y_test)

2. Model Selection:

  • Choose a machine learning or deep learning model for document classification. Depending on your task, you can use models like Naive Bayes, SVM, or deep learning models like CNNs, RNNs, or transformers.

3. Model Training:

  • Train your selected model using the training data.
from sklearn.naive_bayes import MultinomialNB

# Example with Naive Bayes
model = MultinomialNB()
model.fit(X_train, y_train)

4. Model Evaluation:

  • Evaluate the model’s performance on the testing data using appropriate evaluation metrics like accuracy, precision, recall, and F1-score.
from sklearn.metrics import accuracy_score, classification_report

# Make predictions
y_pred = model.predict(X_test)

# Evaluate the model
accuracy = accuracy_score(y_test, y_pred)
classification_rep = classification_report(y_test, y_pred)

print(f"Accuracy: {accuracy}")
print(f"Classification Report:\n{classification_rep}")

5. Model Deployment:

  • Deploy the trained model in your application or system where document classification is needed.

6. Continuous Improvement:

  • Periodically retrain the model with new data to maintain accuracy and up-to-date.
  • Collect user feedback and integrate it into the model’s improvement process.

This is a simplified example of implementing document classification in Python. Depending on your specific requirements and the complexity of your classification task, you may need to explore more advanced techniques, hyperparameter tuning, and deep learning models. Libraries like scikit-learn, TensorFlow, and PyTorch provide extensive tools and resources for implementing document classification.

Challenges and Considerations

Document classification, while a powerful tool for organizing and extracting value from textual data, comes with challenges and considerations. This section will explore these challenges and essential factors when implementing document classification solutions.

1. Dealing with Noisy Data

One of the primary challenges in document classification is dealing with noisy data. Text data often contains errors, misspellings, abbreviations, and special characters, affecting the model’s performance. Consider:

  • Text Cleaning: Robust data preprocessing techniques are essential to remove or correct noisy elements in the text data.
  • Spell Checkers: Implement spell checkers or typo correction mechanisms to handle spelling errors.
  • Handling Abbreviations: Decide how to take abbreviations and acronyms, whether to expand them or leave them as they are.

2. Domain-Specific Challenges

Document classification tasks can vary widely based on the domain or industry. Understanding and addressing domain-specific challenges is crucial. Consider:

  • Domain Knowledge: Familiarize yourself with the specific domain and its terminology, as domain-specific terms and concepts may not be readily understood by a generic model.
  • Custom Features: Create custom features or embeddings tailored to the domain if necessary.
  • Fine-Tuning: Fine-tune pre-trained models on domain-specific data to adapt them to your particular use case.

3. Handling Large Datasets

Working with large datasets can pose challenges regarding data storage, computational resources, and model training time. Consider:

  • Data Sampling: If your dataset is large, you may need to sample a representative subset for model development and testing.
  • Computational Resources: Ensure you can access sufficient computational resources, including GPUs or TPUs, to train and deploy models efficiently.
  • Scalability: Build models that scale with your dataset size and processing needs.

4. Ethical and Privacy Considerations

Document classification can have ethical and privacy implications, especially when dealing with sensitive or personal data. Consider:

  • Privacy Regulations: Ensure compliance with data protection regulations, such as GDPR, HIPAA, or CCPA, when working with sensitive data.
  • Bias and Fairness: Be vigilant about potential biases in your data and model predictions, and strive for fairness and equity.
  • User Consent: If your document classification involves user-generated content, obtain appropriate user consent for data usage.

5. Handling Imbalanced Data

Imbalanced datasets are common in document classification, where some categories may have significantly fewer examples than others. Addressing class imbalance is crucial to prevent models from being biased toward dominant classes. Consider:

  • Oversampling: Create additional copies of minority class samples to balance the dataset.
  • Undersampling: Reduce the number of majority class samples to balance the dataset.
  • Synthetic Data Generation: Use techniques like SMOTE to generate synthetic examples for minority classes.
  • Evaluation Metrics: Use appropriate evaluation metrics, such as F1-score, precision-recall, or ROC-AUC, which are more robust for imbalanced datasets than accuracy.

6. Model Interpretability

Deep learning models, particularly complex neural networks, can be challenging to interpret. Consider the following for model interpretability:

  • Explainability: Implement techniques for model explainability, such as LIME (Local Interpretable Model-Agnostic Explanations) or SHAP (SHapley Additive exPlanations), to understand how your model makes predictions.
  • Feature Importance: Determine which features or words are most influential in classification.
  • Visualization: Create visualizations that help stakeholders understand how the model works.

7. Model Evaluation Challenges

Model evaluation is crucial for assessing performance, but it can be challenging due to various factors:

  • Ambiguity: Some documents may be inherently ambiguous or belong to multiple categories, making it challenging to assign a single label.
  • Evolving Data: Document classification models can become less accurate if data distribution changes. Regular reevaluation and retraining are necessary.
  • Scalability: As the volume of documents grows, scalability issues can arise regarding model performance, storage, and processing speed.

Document classification is a powerful tool for managing and extracting insights from textual data but it comes with several challenges. Addressing issues related to data quality, domain-specific considerations, privacy, class imbalance, and model interpretability is crucial for the success of document classification projects. Additionally, staying up-to-date with best practices and ethical guidelines is essential in the evolving landscape of NLP.

Conclusion

Document classification is a fundamental and powerful tool in natural language processing that empowers organizations to organize, search, and extract valuable insights from large volumes of textual data. This process, from data preparation to model deployment, profoundly impacts various industries and applications, from information retrieval to content recommendation, spam detection, and beyond.

Through this guide, we’ve explored the basics of document classification, covering techniques for data preprocessing, model selection, and evaluation. We’ve delved into traditional machine learning models and modern deep learning approaches, highlighting the importance of choosing the suitable model for the task. We’ve also discussed challenges such as dealing with noisy data, ethical considerations, and the ever-evolving nature of document classification.

As you embark on your journey to implement document classification in Python or any other language, remember that success depends not only on technical proficiency but also on domain expertise, data quality, and ethical awareness. Continual improvement, user feedback, and a commitment to staying informed about the latest developments in the field are vital in maintaining a successful document classification system.

In the era of big data and information overload, document classification is a valuable ally in making sense of the textual world. With the right strategies, tools, and a thoughtful approach, you can harness the power of document classification to derive meaningful insights and make informed decisions in your organization or projects.

About the Author

Neri Van Otten

Neri Van Otten

Neri Van Otten is the founder of Spot Intelligence, a machine learning engineer with over 12 years of experience specialising in Natural Language Processing (NLP) and deep learning innovation. Dedicated to making your projects succeed.

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