# 26

Questions d'entretien pour Machine Learning Research Scientist partagées par les candidats

## Principales questions d'entretien

Trier: Pertinence|Populaires|Date
On a demandé à un Research Scientist/Machine Learning...27 novembre 2014

### More on machine learning algorithms. Easy coding question

1 réponses

Can you provide more details on the questions please?

1 réponses

Gave example

### You have a linked list of numbers, how would you return the median ? Follow up, what is the worst case performance?

1 réponses

Basic data structures. Sorting algorithm. Calculate indices used to return or compute the median. Use indices in loop. Moins

### After you have decided which features to use, describe the process of constructing feature-vectors

1 réponses

It was almost all about tf-idf vectorizer

### You have a singly linked list, how would you find the median?

1 réponses

Sort it (choose an algorithm), calculate index for median, loop over next based on index. They will want to actually discuss implementation (i.e. use a for loop, traverse next ptr, etc.). You should also know algorithmic complexity (big-O notation). Moins

### Describe a project where there were multiple alternatives from which to choose in implementing it.

1 réponses

Gave examples from work history.

### '''Question 1: Given a sorted but rotated array, and a target, find the location of the target in the array. If the target is not in the array, returns -1 1) INPUT: [3,6,7,1,2], target = 1 OUTPUT: 3 2) INPUT: [3,6,7,1,2], target = 9 OUTPUT: -1 '''

1 réponses

def search(A, target): if target == None: return -1 #if not target: # return -1 #riht I needed to address this! try: target = int(target) except ValueError: return -1 l=0 n = len(A) r = n-1 while l&lt;=r: middle=l+((r-l)/2) if A[middle] == target: return middle if A[l] &lt;= A[middle]: if ((A[l]&lt;= target) and (target Moins

### If you were designing a robot lawnmower, where would you start?

1 réponses

They will ask you about how specifically you implement the perception algorithms, what sensors you will use, and where you put the sensors. They were more interested in computer vision. Moins

### How do you implement feature selection in text classification?

1 réponses

Mutual information / chi-squared criteria

### If you were designing a robot lawn mower, where would you start? Various follow ups including sensors, limited to cameras, where mounted? How would you recognize people? Describe skeletal model?

1 réponses

This was basically describe the technical solution and they wanted also to know specifically how I would implement them. Moins

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