EEException: A mapped function's arguments cannot be used in client-side operations

[rheashetty87]

Hi,
I am trying to use Image.collection to obtain different bands values and convert it into numpy array, so that I can use it for further machine learning tasks. But when I do so, I am getting this error EEException: A mapped function's arguments cannot be used in client-side operations. Can you please help me.

Here is the code:

start_date = '2021-01-01'
end_date = '2021-12-31'

region = ee.Geometry.Rectangle([-122.44, 37.74, -122.13, 37.97])

image_collection = ee.ImageCollection('LANDSAT/LC08/C01/T1_TOA') .filterBounds(region) .filterDate(start_date, end_date)

bands_to_extract = ['B1', 'B2', 'B3', 'B4', 'B5', 'B6', 'B7']

def extract_image_values(image):
image_data = image.sample(region, scale=30)
return np.array([image_data.aggregate_array(band).getInfo() for band in bands_to_extract])

bands_data = image_collection.map(extract_image_values)

numpy_array = np.array(bands_data.toList(image_collection.size()).getInfo())

[giswqs]

You can't use .getInfo() within the map function. Check out xee