我正在使用Tensorflow的BERT语言模型处理一个二分类问题。这里是Google Colab的链接。在保存并加载模型训练后，我在进行预测时遇到了错误。
保存模型
def serving_input_receiver_fn(): feature_spec = { "input_ids" : tf.FixedLenFeature([MAX_SEQ_LENGTH], tf.int64), "input_mask" : tf.FixedLenFeature([MAX_SEQ_LENGTH], tf.int64), "segment_ids" : tf.FixedLenFeature([MAX_SEQ_LENGTH], tf.int64), "label_ids" : tf.FixedLenFeature([], tf.int64) } serialized_tf_example = tf.placeholder(dtype=tf.string, shape=[None], name='input_example_tensor') print(serialized_tf_example.shape) receiver_tensors = {'example': serialized_tf_example} features = tf.parse_example(serialized_tf_example, feature_spec) return tf.estimator.export.ServingInputReceiver(features, receiver_tensors)export_path = '/content/drive/My Drive/binary_class/bert/'estimator._export_to_tpu = False # 这很重要estimator.export_saved_model(export_dir_base=export_path,serving_input_receiver_fn=serving_input_receiver_fn)对虚拟文本进行预测
pred_sentences = [ "A novel, simple method to get insights from reviews"]def getPrediction1(in_sentences): labels = ["Irrelevant", "Relevant"] input_examples = [run_classifier.InputExample(guid="", text_a = x, text_b = None, label = 0) for x in in_sentences] # 这里，""只是一个虚拟标签 input_features = run_classifier.convert_examples_to_features(input_examples, label_list, MAX_SEQ_LENGTH, tokenizer) predict_input_fn = run_classifier.input_fn_builder(features=input_features, seq_length=MAX_SEQ_LENGTH, is_training=False, drop_remainder=False) predictions = est.predict(predict_input_fn) print(predictions) return [(sentence, prediction['probabilities'], labels[prediction['labels']]) for sentence, prediction in zip(in_sentences, predictions)]est = tf.contrib.estimator.SavedModelEstimator(MODEL_FILE_PATH)predictions = getPrediction1(pred_sentences[0])predictions错误
W0702 05:44:17.551325 139812812932992 estimator.py:1811] Using temporary folder as model directory: /tmp/tmpzeiaa6q8W0702 05:44:17.605536 139812812932992 saved_model_estimator.py:170] train mode not found in SavedModel.W0702 05:44:17.608479 139812812932992 saved_model_estimator.py:170] eval mode not found in SavedModel.<generator object Estimator.predict at 0x7f27fa721eb8>---------------------------------------------------------------------------KeyError Traceback (most recent call last)<ipython-input-28-56ea95428bf4> in <module>() 21 # Relevant "Nanoparticulate drug delivery is a promising drug delivery system to a range of molecules to desired site specific action in the body. In this present work nanoparticles are prepared with positive group of amino group of chitosan with varying concentration based nanoparticles are loaded with anastrazole were prepared by with negative group of sodium tripolyphosphate by ionotropic gelation method. All these formulated nanoparticles are characterized for its particle size ,zeta potential ,drug entrapment efficacy and in-vitro release kinetics .The particle size of all these formulations were found to be 200,365,420,428 And 483.zeta potential of all formulations are-16.3±2.1 ,28.2±4.3,-10.38±3.6,-24.31±3.2 and 21.38±5.2.respectively. FT-IR studies indicated that there was no chemical interaction between drug and polymer and stability of drug. The in-vitro release behaviour from all the drug loaded batches was found to be zero order and provided sustained release over a period of 12 h by diffusion and swelling mechanism and The values of n and r 2 for coated batch was 0.731 and 0.979.Since the values of slope (n) lies in between 0.5 and 1 it was concluded that the mechanism by which drug is being released is a Non-Fickian anomalous solute diffusion mechanism, " 22 ---> 23 predictions = getPrediction1(pred_sentences[0:2]) 24 predictions 25 5 frames<ipython-input-28-56ea95428bf4> in getPrediction1(in_sentences) 14 predictions = est.predict(predict_input_fn) 15 print(predictions)---> 16 return [(sentence, prediction['probabilities'], labels[prediction['labels']]) for sentence, prediction in zip(in_sentences, predictions)] 17 18 <ipython-input-28-56ea95428bf4> in <listcomp>(.0) 14 predictions = est.predict(predict_input_fn) 15 print(predictions)---> 16 return [(sentence, prediction['probabilities'], labels[prediction['labels']]) for sentence, prediction in zip(in_sentences, predictions)] 17 18 /usr/local/lib/python3.6/dist-packages/tensorflow_estimator/python/estimator/estimator.py in predict(self, input_fn, predict_keys, hooks, checkpoint_path, yield_single_examples) 615 self._create_and_assert_global_step(g) 616 features, input_hooks = self._get_features_from_input_fn(--> 617 input_fn, ModeKeys.PREDICT) 618 estimator_spec = self._call_model_fn( 619 features, None, ModeKeys.PREDICT, self.config)/usr/local/lib/python3.6/dist-packages/tensorflow_estimator/python/estimator/estimator.py in _get_features_from_input_fn(self, input_fn, mode) 991 def _get_features_from_input_fn(self, input_fn, mode): 992 """Extracts the `features` from return values of `input_fn`."""--> 993 result = self._call_input_fn(input_fn, mode) 994 result, _, hooks = estimator_util.parse_input_fn_result(result) 995 self._validate_features_in_predict_input(result)/usr/local/lib/python3.6/dist-packages/tensorflow_estimator/python/estimator/estimator.py in _call_input_fn(self, input_fn, mode, input_context) 1111 kwargs['input_context'] = input_context 1112 with ops.device('/cpu:0'):-> 1113 return input_fn(**kwargs) 1114 1115 def _call_model_fn(self, features, labels, mode, config):/usr/local/lib/python3.6/dist-packages/bert/run_classifier.py in input_fn(params) 727 def input_fn(params): 728 """The actual input function."""--> 729 batch_size = params["batch_size"] 730 731 num_examples = len(features)KeyError: 'batch_size'batch_size参数存在于estimator中，但在加载的模型参数中不存在。
estimator.params['batch_size'] # 32est.params['batch_size'] # KeyError: 'batch_size'回答：
您正在使用SavedModelEstimator，它不提供传递RunConfig或params参数的选项，
因为模型函数图是在SavedModel中静态定义的。由于SavedModelEstimator是Estimator的子类，params只是存储超参数的字典。我认为您可以在调用getPrediction1之前通过传递所需的（键，值）对来修改params。例如：
est = tf.contrib.estimator.SavedModelEstimator(MODEL_FILE_PATH)est.params['batch_size'] = 1predictions = getPrediction1(pred_sentences)