IBM IBM Data and AI C1000-059 Questions & Answers

• Question 51:

  Which is a preferred approach for simplifying the data transformation steps in machine learning model management and maintenance?

  A. Implement data transformation, feature extraction, feature engineering, and imputation algorithms in one single pipeline.

  B. Do not apply any data transformation or feature extraction or feature engineering steps.

  C. Leverage only deep learning algorithms.

  D. Apply a limited number of data transformation steps from a pre-defined catalog of possible operations independent of the machine learning use case.

  Correct Answer: B

• Question 52:

  After importing a Jupyter notebook and CSV data file into IBM Watson Studio in the IBM Public Cloud project, it is discovered that the notebook code can no longer access the CSV file. What is the most likely reason for this problem?

  A. CSV files cannot be used as data sources in Watson Studio.

  B. The CSV file was converted to a binary blob and must be converted in the notebook code.

  C. The CSV file is stored in a Cloud Object Storage.

  D. The CSV file is stored in a Watson Machine Learning instance and is only accessible via REST API.

  Correct Answer: C

  Reference: https://github.com/IBM/watson-stock-market-predictor/blob/master/README.md

• Question 53:

  The formula for recall is given by (True Positives) / (True Positives + False Negatives).

  What is the recall for this example?

  

  A. 0.2

  B. 0.25

  C. 0.5

  D. 0.33

  Correct Answer: B

  Reference: https://machinelearningmastery.com/precision-recall-and-f-measure-for-imbalanced- classification/

• Question 54:

  Given the following matrix multiplication:

  

  What is the value of P?

  A. ?

  B. 17

  C. 12

  D. ?

  Correct Answer: C

  Reference: https://www.mathsisfun.com/algebra/matrix-multiplying.html

• Question 55:

  A neural network is composed of a first affine transformation (affine1) followed by a ReLU non-linearity, followed by a second affine transformation (affine2). Which two explicit functions are implemented by this neural network? (Choose two.)

  A. y = affine1(ReLU(affine2(x)))

  B. y = max(affine1(x), affine2(x))

  C. y = affine2(ReLU(affine1(x)))

  D. y = affine2(max(affine1(x), 0))

  E. y = ReLU(affine1(x), affine2(x))

  Correct Answer: CD

• Question 56:

  Which statement is true in the context of evaluating metrics for machine learning algorithms?

  A. A random classifier has AUC (the area under ROC curve) of 0.5

  B. Using only one evaluation metric is sufficient

  C. The F-score is always equal to precision

  D. Recall of 1 (100%) is always a good result

  Correct Answer: B

• Question 57:

  When should median value be used instead of mean value for imputing missing data?

  A. for skewed data

  B. for real numbers

  C. for normally distributed data

  D. for large data sets

  Correct Answer: D

• Question 58:

  With the help of AI algorithms, which type of analytics can help organizations make decisions based on facts and probability-weighted projections?

  A. prescriptive analytics

  B. cognitive analytics

  C. predictive analytics

  D. descriptive analytics

  Correct Answer: A

  Reference: https://www.investopedia.com/terms/p/prescriptive-analytics.asp

• Question 59:

  What is the technique called for vectorizing text data which matches the words in different sentences to determine if the sentences are similar?

  A. Cup of Vectors

  B. Box of Lexicon

  C. Sack of Sentences

  D. Bag of Words

  Correct Answer: D

  Reference: https://medium.com/@adriensieg/text-similarities-da019229c894

• Question 60:

  What is the goal of the backpropagation algorithm?

  A. to randomize the trajectory of the neural network parameters during training

  B. to smooth the gradient of the loss function in order to avoid getting trapped in small local minimas

  C. to scale the gradient descent step in proportion to the gradient magnitude

  D. to compute the gradient of the loss function with respect to the neural network parameters

  Correct Answer: B

  Reference: https://www.sciencedirect.com/topics/computer-science/backpropagation