You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "calculate_factorial", "description": "Calculates the factorial of a non-negative integer.", "parameters": {"n": {"description": "The non-negative integer.", "type": "int"}}}, {"name": "count_vowels", "description": "Counts the number of vowels in a given text.", "parameters": {"text": {"description": "The input text.", "type": "str"}}}]
Calculate the factorial of 4 and count the number of vowels in the string 'Machine Learning'.
user
assistant
[{"name": "calculate_factorial", "arguments": {"n": 4}}, {"name": "count_vowels", "arguments": {"text": "Machine Learning"}}]