[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify the code snippets into categories from the provided list of categories. List of categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']"}, {'role': 'user', 'content': 'Identify to which category the provided code belongs and assign the code snippet to at least 1 but up to 5 categories based on the probabilities, ignore if the probability of the category is negligible. Strictly provide your response as a list. Avoid providing any additional information, commentary, or personal opinions.\\nPython Code:def one_hot_encode(x):\n"""\nOne hot encode a list of sample labels. Return a one-hot encoded vector for each label.\n: x: List of sample Labels\n: return: Numpy array of one-hot encoded labels\n"""\nb = np.zeros((len(x), 10))\nb[np.arange(len(x)), x] = 1\nreturn b\n"""\nDON\'T MODIFY ANYTHING IN THIS CELL THAT IS BELOW THIS LINE\n"""\ntests.test_one_hot_encode(one_hot_encode)'}, {'role': 'assistant', 'content': "['data_preprocessing']"}]