[{'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:num_filters = 16\nfeatures = tf.placeholder(tf.float32, [None, n_input])\nlabels = tf.placeholder(tf.float32, [None, n_classes])\nx_image = tf.reshape(features, [-1,28,28,1])\nW_conv = tf.Variable(tf.truncated_normal([5,5,1,num_filters], stddev=0.1))\nh_conv = tf.nn.conv2d(x_image, W_conv, strides=[1,1,1,1], padding="SAME")\nh_pool = tf.nn.max_pool(h_conv, ksize=[1,2,2,1], strides=[1,2,2,1], padding="SAME")'}, {'role': 'assistant', 'content': 'modelling'}]