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import numpy as np
def prepare_vertices(vertices, canonicalize=True):
data = vertices
# Swap axis (gravity=Z instead of Y)
# data = data[..., [2, 0, 1]]
# Make left/right correct
# data[..., [1]] = -data[..., [1]]
# Center the first root to the first frame
data -= data[[0], [0], :]
# Remove the floor
data[..., 2] -= np.min(data[..., 2])
return data
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