add predict_classifier.py

fix #152

ERNIE/README.md

@@ -295,3 +295,25 @@ python -u ernir_encoder.py \
 #### 如何获取输入句子中每个 token 经过 ERNIE 编码后的 Embedding 表示？
 
 [解决方案同上](#如何获取输入句子经过-ERNIE-编码后的-Embedding-表示?)
+
+#### 如何利用 finetune 得到的模型对新数据进行批量预测？
+
+我们以分类任务为例，给出了分类任务进行批量预测的脚本, 使用示例如下:
+
+```
+python -u predict_classifier.py \
+       --use_cuda true \
+       --batch_size 32 \
+       --vocab_path config/vocab.txt \
+       --init_checkpoint "./checkpoints/step_100" \
+       --do_lower_case true \
+       --max_seq_len 128 \
+       --ernie_config_path config/ernie_config.json \
+       --do_predict true \
+       --predict_set ${TASK_DATA_PATH}/lcqmc/test.tsv \
+       --num_labels 2
+```
+
+实际使用时，需要通过 `init_checkpoint` 指定预测用的模型，通过 `predict_set` 指定待预测的数据文件，通过 `num_labels` 配置分类的类别数目;
+
+**Note**: predict_set 的数据格式与 dev_set 和 test_set 的数据格式完全一致，是由 text_a、text_b(可选) 、label 组成的2列/3列 tsv 文件，predict_set 中的 label 列起到占位符的作用，全部置 0 即可;

ERNIE/predict_classifier.py

+#   Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Load classifier's checkpoint to do prediction or save inference model."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os
+import time
+import argparse
+import numpy as np
+import multiprocessing
+import paddle.fluid as fluid
+
+from reader.task_reader import ClassifyReader
+from model.ernie import ErnieConfig
+from finetune.classifier import create_model
+
+from utils.args import ArgumentGroup, print_arguments
+from utils.init import init_pretraining_params
+from finetune_args import parser
+
+# yapf: disable
+parser = argparse.ArgumentParser(__doc__)
+model_g = ArgumentGroup(parser, "model", "options to init, resume and save model.")
+model_g.add_arg("ernie_config_path",            str,  None,  "Path to the json file for bert model config.")
+model_g.add_arg("init_checkpoint",              str,  None,  "Init checkpoint to resume training from.")
+model_g.add_arg("use_fp16",                     bool, False, "Whether to resume parameters from fp16 checkpoint.")
+model_g.add_arg("num_labels",                   int,  2,     "num labels for classify")
+
+data_g = ArgumentGroup(parser, "data", "Data paths, vocab paths and data processing options.")
+data_g.add_arg("predict_set",         str,  None,  "Predict set file")
+data_g.add_arg("vocab_path",          str,  None,  "Vocabulary path.")
+data_g.add_arg("label_map_config",    str,  None,  "Label_map_config json file.")
+data_g.add_arg("max_seq_len",         int,  128,   "Number of words of the longest seqence.")
+data_g.add_arg("batch_size",          int,  32,    "Total examples' number in batch for training. see also --in_tokens.")
+data_g.add_arg("do_lower_case",       bool, True,
+               "Whether to lower case the input text. Should be True for uncased models and False for cased models.")
+
+run_type_g = ArgumentGroup(parser, "run_type", "running type options.")
+run_type_g.add_arg("use_cuda",          bool,   True,  "If set, use GPU for training.")
+run_type_g.add_arg("do_prediction",     bool,   True,  "Whether to do prediction on test set.")
+
+args = parser.parse_args()
+# yapf: enable.
+
+def main(args):
+    ernie_config = ErnieConfig(args.ernie_config_path)
+    ernie_config.print_config()
+
+    reader = ClassifyReader(
+        vocab_path=args.vocab_path,
+        label_map_config=args.label_map_config,
+        max_seq_len=args.max_seq_len,
+        do_lower_case=args.do_lower_case,
+        in_tokens=False)
+
+    predict_prog = fluid.Program()
+    predict_startup = fluid.Program()
+    with fluid.program_guard(predict_prog, predict_startup):
+        with fluid.unique_name.guard():
+            predict_pyreader, probs, feed_target_names = create_model(
+                args,
+                pyreader_name='predict_reader',
+                ernie_config=ernie_config,
+                is_prediction=True)
+
+    predict_prog = predict_prog.clone(for_test=True)
+
+    if args.use_cuda:
+        place = fluid.CUDAPlace(0)
+        dev_count = fluid.core.get_cuda_device_count()
+    else:
+        place = fluid.CPUPlace()
+        dev_count = int(os.environ.get('CPU_NUM', multiprocessing.cpu_count()))
+
+    place = fluid.CUDAPlace(0) if args.use_cuda == True else fluid.CPUPlace()
+    exe = fluid.Executor(place)
+    exe.run(predict_startup)
+
+    if args.init_checkpoint:
+        init_pretraining_params(exe, args.init_checkpoint, predict_prog)
+    else:
+        raise ValueError("args 'init_checkpoint' should be set for prediction!")
+
+    predict_exe = fluid.Executor(place)
+
+    predict_data_generator = reader.data_generator(
+        input_file=args.predict_set,
+        batch_size=args.batch_size,
+        epoch=1,
+        shuffle=False)
+
+    predict_pyreader.decorate_tensor_provider(predict_data_generator)
+
+    predict_pyreader.start()
+    all_results = []
+    time_begin = time.time()
+    while True:
+        try:
+            results = predict_exe.run(program=predict_prog, fetch_list=[probs.name])
+            all_results.extend(results[0])
+        except fluid.core.EOFException:
+            predict_pyreader.reset()
+            break
+    time_end = time.time()
+
+    np.set_printoptions(precision=4, suppress=True)
+    print("-------------- prediction results --------------")
+    for index, result in enumerate(all_results):
+        print(str(index) + '\t{}'.format(result))
+
+
+if __name__ == '__main__':
+    print_arguments(args)
+    main(args)