<｜begin▁of▁sentence｜>### Instruction:
Given a graph visualization task where you need to color each node with a unique color from the RainbowPalette, after completing the operation, how do you clear the cache of the RainbowPalette instance to ensure it can be reused without any old state affecting future operations?
### Response:
from igraph.drawing.colors import RainbowPalette

# Create a RainbowPalette instance
palette = RainbowPalette()

# Use the palette for some operation (e.g., coloring nodes)

# ... your code for using the palette ...

# Clear the palette's cache when needed
clear_cache()
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