Bijwerken en opslaan

Stel dat je een Machine Learning-model traint om zeegezichten te herkennen. Je wilt dat het model snapt dat oceanen niet alleen bij felle zomerkleuren horen, dus je zorgt er ook voor dat er afbeeldingen van oceanen bij slecht weer of in avondlicht bij zitten. Mogelijk moet je sommige afbeeldingen handmatig transformeren om de data in balans te brengen. Jouw taak is om de Monet-zee-scène rgb_array te verduisteren.

Herinner je uit de video dat wit overeenkomt met de maximale RGB-waarde van 255, terwijl donkere kleuren lagere waarden hebben. numpy is geladen als np, en de 3D Monet-rgb_array die je in de vorige oefening hebt geladen is beschikbaar.

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Introductie tot NumPy

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# Reduce every value in rgb_array by 50 percent
darker_rgb_array = ____

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Deze oefening maakt deel uit van de cursus

Introductie tot NumPy

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Meet the incredible NumPy array! Learn how to create and change array shapes to suit your needs. Finally, discover NumPy's many data types and how they contribute to speedy array operations.

Exercise 1: Introducing arrays Exercise 2: Your first NumPy array Exercise 3: Creating arrays from scratch Exercise 4: A range array Exercise 5: Array dimensionality Exercise 6: 3D array creation Exercise 7: The fourth dimension Exercise 8: Flattening and reshaping Exercise 9: NumPy data types Exercise 10: The dtype argument Exercise 11: Anticipating data types Exercise 12: A smaller sudoku game

Sharpen your NumPy data wrangling skills by slicing, filtering, and sorting New York City’s tree census data. Create new arrays by pulling data based on conditional statements, and add and remove data along any dimension to suit your purpose. Along the way, you’ll learn the shape and dimension compatibility principles to prepare for super-fast array math.

Exercise 1: Indexing and slicing arrays Exercise 2: Slicing and indexing trees Exercise 3: Stepping into 2D Exercise 4: Sorting trees Exercise 5: Filtering arrays Exercise 6: Filtering with masks Exercise 7: Fancy indexing vs. np.where()Exercise 8: Creating arrays from conditions Exercise 9: Adding and removing data Exercise 10: Compatible or not?Exercise 11: Adding rows Exercise 12: Adding columns Exercise 13: Deleting with np.delete()

Leverage NumPy’s speedy vectorized operations to gather summary insights on sales data for American liquor stores, restaurants, and department stores. Vectorize Python functions for use in your NumPy code. Finally, use broadcasting logic to perform mathematical operations between arrays of different sizes.

Exercise 1: Summarizing data Exercise 2: Sales totals Exercise 3: Plotting averages Exercise 4: Cumulative sales Exercise 5: Vectorized operations Exercise 6: Tax calculations Exercise 7: Projecting sales Exercise 8: Vectorizing .upper()Exercise 9: Broadcasting Exercise 10: Broadcastable or not?Exercise 11: Broadcasting across columns Exercise 12: Broadcasting across rows

NumPy meets the art world in this final chapter as we use image data from a Monet masterpiece to explore how you can use to augment image data. You’ll use flipping and transposing functionality to quickly transform our masterpiece. Next, you’ll pull the Monet array apart, make changes, and reconstruct it using array stacking to see the results.

Exercise 1: Arrays opslaan en laden Exercise 2: NPY-bestanden laden Exercise 3: Hulp vragen Exercise 4: Bijwerken en opslaan

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Exercise 5: Array-acrobatiek Exercise 6: Monet uitbreiden Exercise 7: Je meesterwerk transponeren Exercise 8: Stappelen en splitsen Exercise 9: 2D splits en stacks Exercise 10: RGB-gegevens splitsen Exercise 11: RGB-gegevens stapelen Exercise 12: Gefeliciteerd!