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It's in the name of the model - "Vicuna-13B" implies there are 13 billion parameters.

the way these LLMs work, there is a weight for each parameter? 13 billion weights? what is an example of a parameter?

A parameter is a variable for which a weight (a floating point value) is the concrete value.

a weight is an example of a parameter

so is a bias, and presumably the biases are also in the same file with the weights