I am using code from this link. Run the program with Python 3.6.5 on Windows 7. My scikit-image version 0.13.1
>>> image = data.astronaut()
>>> rows, cols, dim = image.shape
>>> print (rows, cols, dim)
512 512 3
>>> pyramid = tuple(pyramid_gaussian(image, downscale=2, multichannel=True))
TypeError: pyramid_gaussian() got an unexpected keyword argument 'multichannel'
The link you are referring to shows an example in the documentation of scikit-image 0.14dev (documentation). However, you are using version 0.13.1 and in this version, the parameter multichannel is not available (documentation).