ML Quiz 6

In pandas, Index values must be?

• unique

• hashable

• both

• none

Which of the following is correct Features of DataFrame?

• Potentially columns are of different types

• Can Perform Arithmetic operations on rows and columns

• Labeled axes (rows and columns)

• All of the above

Which of the following is true?

• If data is an ndarray, index must be the same length as data.

• Series is a one-dimensional labeled array capable of holding any data type

• Both A and B

• None of the above

Which of the following statement is false?

• ndarray is also known as the axis array.

• ndarray.dataitemSize is the buffer containing the actual elements of the array.

• NumPy main object is the homogeneous multidimensional array

• In Numpy, dimensions are called axes

This function in the library of Pandas allows you to manipulate data and create new variables:

• read_csv function

• pivot_table function

• apply function

• merge function

Which of the following takes a dict of dicts or a dict of array-like sequences and returns a DataFrame?

• DataFrame.from_items

• DataFrame.from_records

• DataFrame.from_dict

• All of the Mentioned

For a neural network, which one of these structural assumptions is the one that most affects the trade-off between underfitting (i.e. a high bias model) and overfitting (i.e. a high variance model):

• The number of hidden nodes

• The learning rate

• The initial choice of weights

• The use of a constant-term unit input

Which of the following sentence is FALSE regarding regression?

• It relates inputs to outputs.

• It is used for prediction.

• It may be used for interpretation.

• It discovers causal relationships.

Generalization error measures how well an algorithm perform on unseen data. The test error obtained using cross-validation is an estimate of the generalization error. Is this estimate unbiased?

• Yes

• No

Adding more basis functions in a linear model... (pick the most probably option)

• Decreases model bias

• Decreases estimation bias

• Decreases variance 4

• Doesn’t affect bias and variance