Merge pull request #1628 from huggingface/tfglue

run_tf_glue works with all tasks

examples/run_tf_glue.py

 import os
 import tensorflow as tf
 import tensorflow_datasets
-from transformers import BertTokenizer, TFBertForSequenceClassification, glue_convert_examples_to_features, BertForSequenceClassification
+from transformers import BertTokenizer, TFBertForSequenceClassification, BertConfig, glue_convert_examples_to_features, BertForSequenceClassification, glue_processors
 
 # script parameters
 BATCH_SIZE = 32
 EVAL_BATCH_SIZE = BATCH_SIZE * 2
 USE_XLA = False
 USE_AMP = False
+EPOCHS = 3
+
+TASK = "mrpc"
+
+if TASK == "sst-2":
+    TFDS_TASK = "sst2"
+elif TASK == "sts-b":
+    TFDS_TASK = "stsb"
+else: 
+    TFDS_TASK = TASK
+
+num_labels = len(glue_processors[TASK]().get_labels())
+print(num_labels)
 
 tf.config.optimizer.set_jit(USE_XLA)
 tf.config.optimizer.set_experimental_options({"auto_mixed_precision": USE_AMP})
 
-# Load tokenizer and model from pretrained model/vocabulary
+# Load tokenizer and model from pretrained model/vocabulary. Specify the number of labels to classify (2+: classification, 1: regression)
+config = BertConfig.from_pretrained("bert-base-cased", num_labels=num_labels)
 tokenizer = BertTokenizer.from_pretrained('bert-base-cased')
-model = TFBertForSequenceClassification.from_pretrained('bert-base-cased')
+model = TFBertForSequenceClassification.from_pretrained('bert-base-cased', config=config)
 
 # Load dataset via TensorFlow Datasets
-data, info = tensorflow_datasets.load('glue/mrpc', with_info=True)
+data, info = tensorflow_datasets.load(f'glue/{TFDS_TASK}', with_info=True)
 train_examples = info.splits['train'].num_examples
+
+# MNLI expects either validation_matched or validation_mismatched
 valid_examples = info.splits['validation'].num_examples
 
 # Prepare dataset for GLUE as a tf.data.Dataset instance
-train_dataset = glue_convert_examples_to_features(data['train'], tokenizer, 128, 'mrpc')
-valid_dataset = glue_convert_examples_to_features(data['validation'], tokenizer, 128, 'mrpc')
+train_dataset = glue_convert_examples_to_features(data['train'], tokenizer, 128, TASK)
+
+# MNLI expects either validation_matched or validation_mismatched
+valid_dataset = glue_convert_examples_to_features(data['validation'], tokenizer, 128, TASK)
 train_dataset = train_dataset.shuffle(128).batch(BATCH_SIZE).repeat(-1)
 valid_dataset = valid_dataset.batch(EVAL_BATCH_SIZE)
 
@@ -32,7 +50,13 @@ opt = tf.keras.optimizers.Adam(learning_rate=3e-5, epsilon=1e-08)
 if USE_AMP:
     # loss scaling is currently required when using mixed precision
     opt = tf.keras.mixed_precision.experimental.LossScaleOptimizer(opt, 'dynamic')
-loss = tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True)
+
+
+if num_labels == 1:
+    loss = tf.keras.losses.MeanSquaredError()
+else:
+    loss = tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True)
+
 metric = tf.keras.metrics.SparseCategoricalAccuracy('accuracy')
 model.compile(optimizer=opt, loss=loss, metrics=[metric])
 
@@ -40,7 +64,7 @@ model.compile(optimizer=opt, loss=loss, metrics=[metric])
 train_steps = train_examples//BATCH_SIZE
 valid_steps = valid_examples//EVAL_BATCH_SIZE
 
-history = model.fit(train_dataset, epochs=2, steps_per_epoch=train_steps,
+history = model.fit(train_dataset, epochs=EPOCHS, steps_per_epoch=train_steps,
                     validation_data=valid_dataset, validation_steps=valid_steps)
 
 # Save TF2 model
@@ -57,6 +81,9 @@ sentence_2 = 'His findings were not compatible with this research.'
 inputs_1 = tokenizer.encode_plus(sentence_0, sentence_1, add_special_tokens=True, return_tensors='pt')
 inputs_2 = tokenizer.encode_plus(sentence_0, sentence_2, add_special_tokens=True, return_tensors='pt')
 
+del inputs_1["special_tokens_mask"]
+del inputs_2["special_tokens_mask"]
+
 pred_1 = pytorch_model(**inputs_1)[0].argmax().item()
 pred_2 = pytorch_model(**inputs_2)[0].argmax().item()
 print('sentence_1 is', 'a paraphrase' if pred_1 else 'not a paraphrase', 'of sentence_0')

transformers/data/processors/glue.py

@@ -80,6 +80,7 @@ def glue_convert_examples_to_features(examples, tokenizer,
             logger.info("Writing example %d" % (ex_index))
         if is_tf_dataset:
             example = processor.get_example_from_tensor_dict(example)
+            example = processor.tfds_map(example)
 
         inputs = tokenizer.encode_plus(
             example.text_a,

transformers/data/processors/utils.py

@@ -107,6 +107,13 @@ class DataProcessor(object):
         """Gets the list of labels for this data set."""
         raise NotImplementedError()
 
+    def tfds_map(self, example):
+        """Some tensorflow_datasets datasets are not formatted the same way the GLUE datasets are. 
+        This method converts examples to the correct format."""
+        if len(self.get_labels()) > 1:
+            example.label = self.get_labels()[int(example.label)]
+        return example
+
     @classmethod
     def _read_tsv(cls, input_file, quotechar=None):
         """Reads a tab separated value file."""