[{'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:epochs = 20\nbatch_size = 200\nsess.run(tf.global_variables_initializer())\nfor e in range(epochs):\nfor ii in range(mnist.train.num_examples//batch_size):\nbatch = mnist.train.next_batch(batch_size)\nimgs = batch[0].reshape((-1, 28, 28, 1))\nbatch_cost, _ = sess.run([cost, opt], feed_dict={inputs_: imgs,\ntargets_: imgs})\nprint("Epoch: {}/{}...".format(e+1, epochs),\n"Training loss: {:.4f}".format(batch_cost))'}, {'role': 'assistant', 'content': 'modelling'}]