Feature extraction from text and images

ByAdmin July 10, 2021

Week – 1 Feature extraction from text and images >>> How to Win a Data Science Competition: Learn from Top Kagglers

N-grams always help increase significance of important words

N-grams can help utilize local context around each word

Levenshteining should always be applied before computing n-grams

N-grams features are typically sparse

Bag of words usually produces longer vectors than Word2vec

You do not need bag of words features in a competition if you have word2vec features.

Semantically similar words usually have similar word2vec embeddings.

Meaning of each value in BOW matrix is unknown.

We consider to use two networks: ResNet-50 with imagenet accuracy of X and VGG-16 with imageNet accuracy of Y (X < Y). Select true statements.

2 points

With one pretrained CNN model you can get only one vector of descriptors for an image

Descriptors from ResNet 50 will always be better than the ones from VGG-16 in our pipeline.

It is not clear what descriptors are better on our dataset. We should evaluate both.

For any image descriptors from the last hidden layer of ResNet-50 are the same as the descriptors from the last hidden layer of VGG-16.

Descriptors from ResNet-50 and from VGG-16 are always very similar in cosine distance.

True, False

False, True

True, True

False, False

How to Win a Data Science Competition

Ensembling

ByAdmin July 11, 2021July 11, 2021

Week- 4 Ensembling >>> How to Win a Data Science Competition: Learn from Top Kagglers Programming Assignment: Ensembling implementation Click Here For Assignment 1. Suppose we are given…

How to Win a Data Science Competition

Graded Soft/Hard Quiz of How to Win a Data Science Competition

ByAdmin July 10, 2021

Week – 1 Graded Soft/Hard Quiz of How to Win a Data Science Competition Learn from Top Kagglers 1. Which library provides the most convenient way to perform matrix multiplication?…

How to Win a Data Science Competition

Mean encodings

ByAdmin July 11, 2021July 11, 2021

Week – 3 Mean encodings >>> How to Win a Data Science Competition: Learn from Top Kagglers 1. What can be an indicator of usefulness of mean encodings? 1 point…

How to Win a Data Science Competition

Metrics

ByAdmin July 11, 2021

week – 3 Metrics >>> How to Win a Data Science Competition Learn from Top Kagglers 1. Suppose we solve a binary classification task and our solution is scores with…

How to Win a Data Science Competition

Graded Advanced Features II Quiz

ByAdmin July 11, 2021

Week – 4 Graded Advanced Features II Quiz >>> How to Win a Data Science Competition Learn from Top Kagglers 1. Imagine that we apply X = PCA(n_components=5).fit_transform(data) and data…

How to Win a Data Science Competition

Validation

ByAdmin July 10, 2021

Week – 2 Validation >>> How to Win a Data Science Competition: Learn from Top Kagglers 1. Select true statements 1 point Performance increase on a fixed cross-validation split guaranties…

Week – 1 Feature extraction from text and images >>> How to Win a Data Science Competition: Learn from Top Kagglers

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