[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': "Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:inval = pd.DataFrame()\ninval['won'] = df[df['won'] > 0]['init_thr'].value_counts(sort=False) / num_win\ninval['lost'] = df[df['won'] == 0]['init_thr'].value_counts() / num_lose\nax = inval.sort_index().plot.bar(title='Initial Threshold (effective value thr for first card taken)', \\\nlegend=False, color=['r', 'b'], alpha=opacity)\nleg = ax.legend(bbox_to_anchor=(1.05, 1), loc=2, borderaxespad=0.)"}, {'role': 'assistant', 'content': 'result_visualization'}]