📚 Data Science Riddle
Which Metric is best for imbalanced classification?
Which Metric is best for imbalanced classification?
Anonymous Quiz
20%
Accuracy
17%
Precision
19%
Recall
43%
F1-Score
📚 Data Science Riddle
A dataset has 20% missing values in a critical column. What's the most practical choice?
A dataset has 20% missing values in a critical column. What's the most practical choice?
Anonymous Quiz
5%
Drop all rows
49%
Fill with mean/median
42%
Use model-based imputation
5%
Ignore missing data
❤2
ML models don’t all think alike 🤖
❇️ Naive Bayes = probability
❇️ KNN = proximity
❇️ Discriminant Analysis = decision boundaries
Different paths, same goal: accurate classification.
Which one do you reach for first?
❇️ Naive Bayes = probability
❇️ KNN = proximity
❇️ Discriminant Analysis = decision boundaries
Different paths, same goal: accurate classification.
Which one do you reach for first?
❤4
📚 Data Science Riddle
In a medical diagnosis project, what's more important?
In a medical diagnosis project, what's more important?
Anonymous Quiz
33%
High precision
14%
High recall
40%
High accuracy
13%
High F1-score
Important LLM Terms
🔹 Transformer Architecture
🔹 Attention Mechanism
🔹 Pre-training
🔹 Fine-tuning
🔹 Parameters
🔹 Self-Attention
🔹 Embeddings
🔹 Context Window
🔹 Masked Language Modeling (MLM)
🔹 Causal Language Modeling (CLM)
🔹 Multi-Head Attention
🔹 Tokenization
🔹 Zero-Shot Learning
🔹 Few-Shot Learning
🔹 Transfer Learning
🔹 Overfitting
🔹 Inference
🔹 Language Model Decoding
🔹 Hallucination
🔹 Latency
🔹 Transformer Architecture
🔹 Attention Mechanism
🔹 Pre-training
🔹 Fine-tuning
🔹 Parameters
🔹 Self-Attention
🔹 Embeddings
🔹 Context Window
🔹 Masked Language Modeling (MLM)
🔹 Causal Language Modeling (CLM)
🔹 Multi-Head Attention
🔹 Tokenization
🔹 Zero-Shot Learning
🔹 Few-Shot Learning
🔹 Transfer Learning
🔹 Overfitting
🔹 Inference
🔹 Language Model Decoding
🔹 Hallucination
🔹 Latency
❤9
Why is Kafka Called Kafka❔
Here’s a fun fact that surprises a lot of people.
The “Kafka” you use for real-time data pipelines is… named after the novelist Franz Kafka.
Why? Jay Kreps (the creator) once explained it simply:
- He liked the name.
- It sounded mysterious.
- And Kafka (the author) wrote a lot.
That last part is key.
Because Apache Kafka is all about writing: streams of events, logs, and data in motion.
So the name stuck.
Today, Millions of engineers across the globe talk about “Kafka” every single day… and most don’t realize they’re also invoking a 20th-century novelist.
It's funny how small choices like naming your project can shape how the world remembers it.
Here’s a fun fact that surprises a lot of people.
The “Kafka” you use for real-time data pipelines is… named after the novelist Franz Kafka.
Why? Jay Kreps (the creator) once explained it simply:
- He liked the name.
- It sounded mysterious.
- And Kafka (the author) wrote a lot.
That last part is key.
Because Apache Kafka is all about writing: streams of events, logs, and data in motion.
So the name stuck.
Today, Millions of engineers across the globe talk about “Kafka” every single day… and most don’t realize they’re also invoking a 20th-century novelist.
It's funny how small choices like naming your project can shape how the world remembers it.
❤4👍1😁1
📚 Data Science Riddle
Why do CNNs use pooling layers?
Why do CNNs use pooling layers?
Anonymous Quiz
50%
Reduce dimensionality
16%
Increase non-linearity
14%
Normalize activations
20%
Improve learning rate
❤4
Data Analyst 🆚 Data Engineer: Key Differences
Confused about the roles of a Data Analyst and Data Engineer? 🤔 Here's a breakdown:
👨💻 Data Analyst:
🎯 Role: Analyzes, interprets, & visualizes data to extract insights for business decisions.
👍 Best For: Those who enjoy finding patterns, trends, & actionable insights.
🔑 Responsibilities:
🧹 Cleaning & organizing data.
📊 Using tools like Excel, Power BI, Tableau & SQL.
📝 Creating reports & dashboards.
🤝 Collaborating with business teams.
Skills: Analytical skills, SQL, Excel, reporting tools, statistical analysis, business intelligence.
✅ Outcome: Guides decision-making in business, marketing, finance, etc.
⚙️ Data Engineer:
🏗️ Role: Designs, builds, & maintains data infrastructure.
👍 Best For: Those who enjoy technical data management & architecture for large-scale analysis.
🔑 Responsibilities:
🗄️ Managing databases & data pipelines.
🔄 Developing ETL processes.
🔒 Ensuring data quality & security.
☁️ Working with big data technologies like Hadoop, Spark, AWS, Azure & Google Cloud.
Skills: Python, Java, Scala, database management, big data tools, data architecture, cloud technologies.
✅ Outcome: Creates infrastructure & pipelines for efficient data flow for analysis.
In short: Data Analysts extract insights, while Data Engineers build the systems for data storage, processing, & analysis. Data Analysts focus on business outcomes, while Data Engineers focus on the technical foundation.
Confused about the roles of a Data Analyst and Data Engineer? 🤔 Here's a breakdown:
👨💻 Data Analyst:
🎯 Role: Analyzes, interprets, & visualizes data to extract insights for business decisions.
👍 Best For: Those who enjoy finding patterns, trends, & actionable insights.
🔑 Responsibilities:
🧹 Cleaning & organizing data.
📊 Using tools like Excel, Power BI, Tableau & SQL.
📝 Creating reports & dashboards.
🤝 Collaborating with business teams.
Skills: Analytical skills, SQL, Excel, reporting tools, statistical analysis, business intelligence.
✅ Outcome: Guides decision-making in business, marketing, finance, etc.
⚙️ Data Engineer:
🏗️ Role: Designs, builds, & maintains data infrastructure.
👍 Best For: Those who enjoy technical data management & architecture for large-scale analysis.
🔑 Responsibilities:
🗄️ Managing databases & data pipelines.
🔄 Developing ETL processes.
🔒 Ensuring data quality & security.
☁️ Working with big data technologies like Hadoop, Spark, AWS, Azure & Google Cloud.
Skills: Python, Java, Scala, database management, big data tools, data architecture, cloud technologies.
✅ Outcome: Creates infrastructure & pipelines for efficient data flow for analysis.
In short: Data Analysts extract insights, while Data Engineers build the systems for data storage, processing, & analysis. Data Analysts focus on business outcomes, while Data Engineers focus on the technical foundation.
❤5
Softmax vs Sigmoid Functions
Two of the most common activation functions… and two of the most misunderstood.
Sigmoid: squashes input into a range between 0 and 1. Perfect for binary classification (yes/no problems). Example: spam or not spam.
Softmax: takes a vector of numbers and turns them into probabilities that sum to 1. Perfect for multi-class classification (cat vs dog vs horse).
👉 Rule of thumb:
Binary task → use Sigmoid.
Multi-class task → use Softmax.
Simple, but if you get this wrong, your model will never make sense.
Two of the most common activation functions… and two of the most misunderstood.
Sigmoid: squashes input into a range between 0 and 1. Perfect for binary classification (yes/no problems). Example: spam or not spam.
Softmax: takes a vector of numbers and turns them into probabilities that sum to 1. Perfect for multi-class classification (cat vs dog vs horse).
👉 Rule of thumb:
Binary task → use Sigmoid.
Multi-class task → use Softmax.
Simple, but if you get this wrong, your model will never make sense.
❤2