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": "split_list", "description": "Splits a list into chunks of a specified size.", "parameters": {"lst": {"description": "The input list.", "type": "List"}, "chunk_size": {"description": "The size of each chunk.", "type": "int"}}}, {"name": "word_frequency", "description": "Calculates the frequency of each word in a text.", "parameters": {"text": {"description": "The input text.", "type": "str"}}}, {"name": "is_subset", "description": "Checks if one set is a subset of another set.", "parameters": {"set1": {"description": "The first set.", "type": "set"}, "set2": {"description": "The second set.", "type": "set"}}}, {"name": "reverse_string", "description": "Reverses the characters in a string.", "parameters": {"text": {"description": "The input string.", "type": "str"}}}]
Determine the word frequency of 'Data science is fascinating.'
user
assistant
[{"name": "word_frequency", "arguments": {"text": "Data science is fascinating."}}]