In the context of neural networks, what does the term "backpropagation" refer to?
- Training a model using historical data
- Forward pass computation
- Adjusting the learning rate
- Updating model weights
"Backpropagation" in neural networks refers to the process of updating the model's weights based on the computed errors during the forward pass. It's a key step in training neural networks and involves minimizing the loss function.
In time series analysis, what is a sequence of data points measured at successive points in time called?
- Time steps
- Data snapshots
- Data vectors
- Time series data
In time series analysis, a sequence of data points measured at successive points in time is called "time series data." This data structure is used to analyze and forecast trends, patterns, and dependencies over time. It's fundamental in fields like finance, economics, and climate science.
To prevent overfitting in neural networks, the _______ technique can be used, which involves dropping out random neurons during training.
- Normalization
- L1 Regularization
- Dropout
- Batch Normalization
The technique used to prevent overfitting in neural networks is called "Dropout." During training, dropout randomly removes a fraction of neurons, helping to prevent overreliance on specific neurons and improving generalization.
When you want to visualize geographical data with customizable layers and styles, which tool is commonly used?
- Python's Matplotlib
- Excel
- Tableau
- QGIS (Quantum GIS)
QGIS, also known as Quantum GIS, is commonly used for visualizing geographical data with customizable layers and styles. It's an open-source Geographic Information System (GIS) software that allows users to create and display maps, making it a valuable tool for geospatial data analysis and visualization.
The metric _______ is particularly useful when the cost of false positives is higher than false negatives.
- Precision
- Recall
- F1 Score
- Specificity
The metric "Precision" is particularly useful when the cost of false positives is higher than false negatives. Precision focuses on the accuracy of positive predictions, making it relevant in scenarios where minimizing false positives is critical, such as medical diagnosis or fraud detection.
In a traditional relational database, the data stored in a tabular format is often referred to as _______ data.
- Structured Data
- Unstructured Data
- Semi-Structured Data
- Raw Data
In a traditional relational database, the data is structured and organized in tables with a predefined schema. It's commonly referred to as "Structured Data" because it adheres to a strict structure and schema.
You're working on a real estate dataset where the price of the house is significantly influenced by its age and square footage. To capture this combined effect, what type of new feature could you create?
- Interaction feature
- Categorical feature with age groups
- Time-series feature
- Ordinal feature
To capture the combined effect of age and square footage on house price, you can create an interaction feature. This feature multiplies or combines the two variables to represent their interaction, allowing the model to consider how they jointly affect the target variable. An interaction feature is valuable in regression models.
Which of the following tools is typically used to manage and query relational databases in Data Science?
- Excel
- Hadoop
- SQL (Structured Query Language)
- Tableau
SQL (Structured Query Language) is a standard tool used for managing and querying relational databases. Data scientists frequently use SQL to extract, manipulate, and analyze data from these databases, making it an essential skill for working with structured data.
In deep learning, the technique used to skip one or more layers by connecting non-adjacent layers is called _______.
- Dropout
- Batch Normalization
- Skip Connections
- Pooling
In deep learning, the technique used to skip one or more layers by connecting non-adjacent layers is called "Skip Connections." Skip connections allow the model to bypass one or more layers and facilitate the flow of information from one layer to another, helping in the training of deep neural networks.
The _______ typically works closely with business stakeholders to understand their requirements and translate them into data-driven insights.
- Data Scientist
- Data Analyst
- Data Engineer
- Business Analyst
Data Scientists often work closely with business stakeholders to understand their requirements and translate them into data-driven insights. They use statistical and analytical techniques to derive insights that support decision-making.
The method where data values are shifted and rescaled to range between 0 and 1 is called _______.
- Data Normalization
- Data Imputation
- Data Resampling
- Data Transformation
The method of shifting and rescaling data values to range between 0 and 1 is known as "data normalization." This is commonly used in machine learning to ensure that all features have the same scale, preventing certain features from dominating others.
In the realm of Data Science, the library _______ in Python is widely used for data manipulation and cleaning.
- TensorFlow
- Pandas
- Matplotlib
- Scikit-learn
Pandas is a popular Python library for data manipulation and cleaning. It provides data structures and functions for working with structured data, making it a valuable tool in data science, which makes option B the correct answer.