Add new SentenceTransformer model.

.gitattributes

@@ -1,6 +1,7 @@
 *.7z filter=lfs diff=lfs merge=lfs -text
 *.arrow filter=lfs diff=lfs merge=lfs -text
 *.bin filter=lfs diff=lfs merge=lfs -text
+*.bin.* filter=lfs diff=lfs merge=lfs -text
 *.bz2 filter=lfs diff=lfs merge=lfs -text
 *.ftz filter=lfs diff=lfs merge=lfs -text
 *.gz filter=lfs diff=lfs merge=lfs -text
@@ -16,12 +17,12 @@
 *.pt filter=lfs diff=lfs merge=lfs -text
 *.pth filter=lfs diff=lfs merge=lfs -text
 *.rar filter=lfs diff=lfs merge=lfs -text
-saved_model/**/* filter=lfs diff=lfs merge=lfs -text
+saved_model/**/* filter=lfs diff=lfs merge=lfs -text 
 *.tar.* filter=lfs diff=lfs merge=lfs -text
 *.tflite filter=lfs diff=lfs merge=lfs -text
 *.tgz filter=lfs diff=lfs merge=lfs -text
-*.wasm filter=lfs diff=lfs merge=lfs -text
 *.xz filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zstandard filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+pytorch_model.bin filter=lfs diff=lfs merge=lfs -text

1_Pooling/config.json

@@ -0,0 +1,7 @@
+{
+  "word_embedding_dimension": 384,
+  "pooling_mode_cls_token": false,
+  "pooling_mode_mean_tokens": true,
+  "pooling_mode_max_tokens": false,
+  "pooling_mode_mean_sqrt_len_tokens": false
+}

config.json

@@ -0,0 +1,24 @@
+{
+  "_name_or_path": "nreimers/MiniLM-L6-H384-uncased",
+  "architectures": [
+    "BertModel"
+  ],
+  "attention_probs_dropout_prob": 0.1,
+  "gradient_checkpointing": false,
+  "hidden_act": "gelu",
+  "hidden_dropout_prob": 0.1,
+  "hidden_size": 384,
+  "initializer_range": 0.02,
+  "intermediate_size": 1536,
+  "layer_norm_eps": 1e-12,
+  "max_position_embeddings": 512,
+  "model_type": "bert",
+  "num_attention_heads": 12,
+  "num_hidden_layers": 6,
+  "pad_token_id": 0,
+  "position_embedding_type": "absolute",
+  "transformers_version": "4.8.2",
+  "type_vocab_size": 2,
+  "use_cache": true,
+  "vocab_size": 30522
+}

config_sentence_transformers.json

@@ -0,0 +1,7 @@
+{
+  "__version__": {
+    "sentence_transformers": "2.0.0",
+    "transformers": "4.6.1",
+    "pytorch": "1.8.1"
+  }
+}

data_config.json

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+        "name": "stackexchange_Title_Answer/small_stackexchanges.jsonl.gz",
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+        "weight": 38
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+    {
+        "name": "sentence-compression.jsonl.gz",
+        "lines": 180000,
+        "weight": 45
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+    {
+        "name": "AllNLI.jsonl.gz",
+        "lines": 277230,
+        "weight": 69
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+    {
+        "name": "eli5_question_answer.jsonl.gz",
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+    {
+        "name": "reddit/reddit_2015.jsonl.gz",
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+        "weight": 82
+    },
+    {
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+        "name": "stackexchange_TitleBody_Answer/math.stackexchange.com.jsonl.gz",
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+        "name": "stackexchange_Title_Answer/math.stackexchange.com.jsonl.gz",
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+        "name": "stackexchange_Title_Answer/stackoverflow.com-Posts.jsonl.gz",
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+    {
+        "name": "stackexchange_title_body/stackoverflow.com-Posts.jsonl.gz",
+        "lines": 18562443,
+        "weight": 83
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+    {
+        "name": "specter_train_triples.jsonl.gz",
+        "lines": 684100,
+        "weight": 84
+    },
+    {
+        "name": "S2ORC_title_abstract.jsonl.gz",
+        "lines": 41769185,
+        "weight": 123
+    },
+    {
+        "name": "S2ORC_citation_pairs.jsonl.gz",
+        "lines": 52603982,
+        "weight": 123
+    },
+    {
+        "name": "PAQ_pairs.jsonl.gz",
+        "lines": 64371441,
+        "weight": 123
+    },
+    {
+        "name": "WikiAnswers_pairs.jsonl.gz",
+        "lines": 77427422,
+        "weight": 123
+    },
+    {
+        "name": "S2ORC_citation_pairs_abstract.jsonl.gz",
+        "lines": 116288806,
+        "weight": 123
+    },
+    {
+        "name": "searchQA_question_top5_snippets_merged.jsonl.gz",
+        "lines": 582261,
+        "weight": 144
+    },
+    {
+        "name": "yahoo_answers_title_question.jsonl.gz",
+        "lines": 659896,
+        "weight": 163
+    },
+    {
+        "name": "yahoo_answers_question_answer.jsonl.gz",
+        "lines": 681164,
+        "weight": 169
+    },
+    {
+        "name": "yahoo_answers_title_answer.jsonl.gz",
+        "lines": 1198260,
+        "weight": 247
+    },
+    {
+        "name": "amazon-qa-train-pairs.jsonl.gz",
+        "lines": 2448839,
+        "weight": 247
+    },
+    {
+        "name": "gooaq_pairs.jsonl.gz",
+        "lines": 3012496,
+        "weight": 247
+    },
+    {
+        "name": "msmarco-query_passage_negative.jsonl.gz",
+        "lines": 9144553,
+        "weight": 247
+    }
+]

modules.json

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+[
+  {
+    "idx": 0,
+    "name": "0",
+    "path": "",
+    "type": "sentence_transformers.models.Transformer"
+  },
+  {
+    "idx": 1,
+    "name": "1",
+    "path": "1_Pooling",
+    "type": "sentence_transformers.models.Pooling"
+  },
+  {
+    "idx": 2,
+    "name": "2",
+    "path": "2_Normalize",
+    "type": "sentence_transformers.models.Normalize"
+  }
+]

pytorch_model.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:c3a85f238711653950f6a79ece63eb0ea93d76f6a6284be04019c53733baf256
+size 90888945

sentence_bert_config.json

@@ -0,0 +1,4 @@
+{
+  "max_seq_length": 256,
+  "do_lower_case": false
+}

special_tokens_map.json

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+{"unk_token": "[UNK]", "sep_token": "[SEP]", "pad_token": "[PAD]", "cls_token": "[CLS]", "mask_token": "[MASK]"}

tokenizer_config.json

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+{"do_lower_case": true, "unk_token": "[UNK]", "sep_token": "[SEP]", "pad_token": "[PAD]", "cls_token": "[CLS]", "mask_token": "[MASK]", "tokenize_chinese_chars": true, "strip_accents": null, "name_or_path": "nreimers/MiniLM-L6-H384-uncased", "do_basic_tokenize": true, "never_split": null, "tokenizer_class": "BertTokenizer", "model_max_length": 512}

train_script.py

@@ -0,0 +1,344 @@
+"""
+Train script for a single file
+
+Need to set the TPU address first:
+export XRT_TPU_CONFIG="localservice;0;localhost:51011"
+"""
+
+import torch.multiprocessing as mp
+import threading
+import time
+import random
+import sys
+import argparse
+import gzip
+import json
+import logging
+import tqdm
+import torch
+from torch import nn
+from torch.utils.data import DataLoader
+import torch
+import torch_xla
+import torch_xla.core
+import torch_xla.core.functions
+import torch_xla.core.xla_model as xm
+import torch_xla.distributed.xla_multiprocessing as xmp
+import torch_xla.distributed.parallel_loader as pl
+import os
+from shutil import copyfile
+
+
+from transformers import (
+    AdamW,
+    AutoModel,
+    AutoTokenizer,
+    get_linear_schedule_with_warmup,
+    set_seed,
+)
+
+class AutoModelForSentenceEmbedding(nn.Module):
+    def __init__(self, model_name, tokenizer, normalize=True):
+        super(AutoModelForSentenceEmbedding, self).__init__()
+
+        self.model = AutoModel.from_pretrained(model_name)
+        self.normalize = normalize
+        self.tokenizer = tokenizer
+
+    def forward(self, **kwargs):
+        model_output = self.model(**kwargs)
+        embeddings = self.mean_pooling(model_output, kwargs['attention_mask'])
+        if self.normalize:
+            embeddings = torch.nn.functional.normalize(embeddings, p=2, dim=1)
+
+        return embeddings
+
+    def mean_pooling(self, model_output, attention_mask):
+        token_embeddings = model_output[0]  # First element of model_output contains all token embeddings
+        input_mask_expanded = attention_mask.unsqueeze(-1).expand(token_embeddings.size()).float()
+        return torch.sum(token_embeddings * input_mask_expanded, 1) / torch.clamp(input_mask_expanded.sum(1), min=1e-9)
+
+    def save_pretrained(self, output_path):
+        if xm.is_master_ordinal():
+            self.tokenizer.save_pretrained(output_path)
+            self.model.config.save_pretrained(output_path)
+
+        xm.save(self.model.state_dict(), os.path.join(output_path, "pytorch_model.bin"))
+       
+
+
+
+def train_function(index, args, queue):
+    tokenizer = AutoTokenizer.from_pretrained(args.model)
+    model = AutoModelForSentenceEmbedding(args.model, tokenizer)
+    
+  
+    ### Train Loop
+    device = xm.xla_device()
+    model = model.to(device)
+
+    # Instantiate optimizer
+    optimizer = AdamW(params=model.parameters(), lr=2e-5, correct_bias=True)
+
+    lr_scheduler = get_linear_schedule_with_warmup(
+        optimizer=optimizer,
+        num_warmup_steps=500,
+        num_training_steps=args.steps,
+    )
+    
+    # Now we train the model
+    cross_entropy_loss = nn.CrossEntropyLoss()
+    max_grad_norm = 1
+
+    model.train()
+   
+    for global_step in tqdm.trange(args.steps, disable=not xm.is_master_ordinal()):
+        #### Get the batch data
+        batch = queue.get()
+        #print(index, "batch {}x{}".format(len(batch), ",".join([str(len(b)) for b in batch])))
+        
+
+        if len(batch[0]) == 2: #(anchor, positive)
+            text1 = tokenizer([b[0] for b in batch], return_tensors="pt", max_length=args.max_length, truncation=True, padding="max_length")
+            text2 = tokenizer([b[1] for b in batch], return_tensors="pt", max_length=args.max_length, truncation=True, padding="max_length")
+
+            ### Compute embeddings
+            embeddings_a = model(**text1.to(device))
+            embeddings_b = model(**text2.to(device))
+            
+            ### Gather all embedings 
+            embeddings_a = torch_xla.core.functions.all_gather(embeddings_a)
+            embeddings_b = torch_xla.core.functions.all_gather(embeddings_b)
+
+            ### Compute similarity scores 512 x 512
+            scores = torch.mm(embeddings_a, embeddings_b.transpose(0, 1)) * args.scale
+        
+            ### Compute cross-entropy loss
+            labels = torch.tensor(range(len(scores)), dtype=torch.long, device=embeddings_a.device)  # Example a[i] should match with b[i]
+            
+            ## Symmetric loss as in CLIP
+            loss = (cross_entropy_loss(scores, labels) + cross_entropy_loss(scores.transpose(0, 1), labels)) / 2
+
+        else:   #(anchor, positive, negative)
+            text1 = tokenizer([b[0] for b in batch], return_tensors="pt", max_length=args.max_length, truncation=True, padding="max_length")
+            text2 = tokenizer([b[1] for b in batch], return_tensors="pt", max_length=args.max_length, truncation=True, padding="max_length")
+            text3 = tokenizer([b[2] for b in batch], return_tensors="pt", max_length=args.max_length, truncation=True, padding="max_length")
+
+            embeddings_a  = model(**text1.to(device))
+            embeddings_b1 = model(**text2.to(device))
+            embeddings_b2 = model(**text3.to(device))
+
+            embeddings_a  = torch_xla.core.functions.all_gather(embeddings_a)
+            embeddings_b1 = torch_xla.core.functions.all_gather(embeddings_b1)
+            embeddings_b2 = torch_xla.core.functions.all_gather(embeddings_b2)
+
+            embeddings_b = torch.cat([embeddings_b1, embeddings_b2])
+
+            ### Compute similarity scores 512 x 1024
+            scores = torch.mm(embeddings_a, embeddings_b.transpose(0, 1)) * args.scale
+        
+            ### Compute cross-entropy loss
+            labels = torch.tensor(range(len(scores)), dtype=torch.long, device=embeddings_a.device)  # Example a[i] should match with b[i]
+            
+            ## One-way loss
+            loss = cross_entropy_loss(scores, labels)
+
+        
+        # Backward pass
+        optimizer.zero_grad()
+        loss.backward()
+        torch.nn.utils.clip_grad_norm_(model.parameters(), max_grad_norm)
+        
+        xm.optimizer_step(optimizer, barrier=True)
+        lr_scheduler.step()
+
+
+        #Save model
+        if (global_step+1) % args.save_steps == 0:
+            output_path = os.path.join(args.output, str(global_step+1))
+            xm.master_print("save model: "+output_path)
+            model.save_pretrained(output_path)
+          
+            
+    output_path = os.path.join(args.output, "final")
+    xm.master_print("save model final: "+ output_path)
+    model.save_pretrained(output_path)
+
+
+def produce_data(args, queue, filepaths, dataset_indices):
+    global_batch_size = args.batch_size*args.nprocs    #Global batch size
+    size_per_dataset = int(global_batch_size / args.datasets_per_batch)    #How many datasets per batch
+    num_same_dataset = int(size_per_dataset / args.batch_size)
+    print("producer", "global_batch_size", global_batch_size)
+    print("producer", "size_per_dataset", size_per_dataset)
+    print("producer", "num_same_dataset", num_same_dataset)
+    
+    datasets = []
+    for filepath in filepaths:
+        if "reddit_" in filepath:       #Special dataset class for Reddit files
+            data_obj = RedditDataset(filepath)
+        else:
+            data_obj = Dataset(filepath)
+        datasets.append(iter(data_obj)) 
+    
+    # Store if dataset is in a 2 col or 3 col format
+    num_cols = {idx: len(next(dataset)) for idx, dataset in enumerate(datasets)}
+
+    while True:
+        texts_in_batch = set()
+        batch_format = None     #2 vs 3 col format for this batch
+        
+        #Add data from several sub datasets
+        for _ in range(args.datasets_per_batch):
+            valid_dataset = False   #Check that datasets have the same 2/3 col format
+            while not valid_dataset:
+                data_idx = random.choice(dataset_indices)
+                if batch_format is None:
+                    batch_format = num_cols[data_idx]
+                    valid_dataset = True
+                else:   #Check that this dataset has the same format
+                    valid_dataset = (batch_format == num_cols[data_idx])
+            
+            #Get data from this dataset
+            dataset = datasets[data_idx]
+            for _ in range(num_same_dataset):
+                for _ in range(args.nprocs):
+                    batch_device = []   #A batch for one device
+                    while len(batch_device) < args.batch_size:
+                        sample = next(dataset)
+                        in_batch = False
+                        for text in sample:
+                            if text in texts_in_batch:
+                                in_batch = True
+                                break
+                        
+                        if not in_batch:
+                            for text in sample:
+                                texts_in_batch.add(text)
+                            batch_device.append(sample)
+
+                    queue.put(batch_device)
+                      
+
+class RedditDataset:
+    """
+    A class that handles the reddit data files
+    """
+    def __init__(self, filepath):
+        self.filepath = filepath
+
+    def __iter__(self):
+        while True:
+            with gzip.open(self.filepath, "rt") as fIn:
+                    for line in fIn:
+                        data = json.loads(line)
+
+                        if "response" in data and "context" in data:
+                            yield [data["response"], data["context"]]
+
+class Dataset:
+    """
+    A class that handles one dataset
+    """
+    def __init__(self, filepath):
+        self.filepath = filepath
+
+    def __iter__(self):
+        max_dataset_size = 10*1000*1000    #Cache small datasets in memory
+        dataset = []
+        data_format = None
+
+        while dataset is None or len(dataset) == 0:
+            with gzip.open(self.filepath, "rt") as fIn:
+                for line in fIn:
+                    data = json.loads(line)
+                    if isinstance(data, dict):
+                        data = data['texts']
+
+                    if data_format is None:
+                        data_format = len(data)
+                    
+                    #Ensure that all entries are of the same 2/3 col format
+                    assert len(data) == data_format
+
+                    if dataset is not None:
+                        dataset.append(data)
+                        if len(dataset) >= max_dataset_size:
+                            dataset = None
+
+                    yield data
+                
+        # Data loaded. Now stream to the queue
+        # Shuffle for each epoch
+        while True:
+            random.shuffle(dataset)
+            for data in dataset:
+                yield data
+                
+               
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--model', default='nreimers/MiniLM-L6-H384-uncased')
+    parser.add_argument('--steps', type=int, default=2000)
+    parser.add_argument('--save_steps', type=int, default=10000)
+    parser.add_argument('--batch_size', type=int, default=64)
+    parser.add_argument('--max_length', type=int, default=128)
+    parser.add_argument('--nprocs', type=int, default=8)
+    parser.add_argument('--datasets_per_batch', type=int, default=2, help="Number of datasets per batch")
+    parser.add_argument('--scale', type=float, default=20, help="Use 20 for cossim, and 1 when you work with unnormalized embeddings with dot product")
+    parser.add_argument('--data_folder', default="/data", help="Folder with your dataset files")
+    parser.add_argument('data_config', help="A data_config.json file")
+    parser.add_argument('output')
+    args = parser.parse_args()
+
+    # Ensure global batch size is divisble by data_sample_size
+    assert (args.batch_size*args.nprocs) % args.datasets_per_batch == 0
+
+    logging.info("Output: "+args.output)
+    if os.path.exists(args.output):
+        print("Output folder already exists.")
+        input("Continue?")
+
+    # Write train script to output path
+    os.makedirs(args.output, exist_ok=True)
+
+    data_config_path = os.path.join(args.output, 'data_config.json')
+    copyfile(args.data_config, data_config_path)
+
+    train_script_path = os.path.join(args.output, 'train_script.py')
+    copyfile(__file__, train_script_path)
+    with open(train_script_path, 'a') as fOut:
+        fOut.write("\n\n# Script was called via:\n#python " + " ".join(sys.argv))
+
+
+
+    #Load data config
+    with open(args.data_config) as fIn:
+        data_config = json.load(fIn)
+
+    queue = mp.Queue(maxsize=100*args.nprocs)
+    
+    filepaths = []
+    dataset_indices = []
+    for idx, data in enumerate(data_config):
+        filepaths.append(os.path.join(os.path.expanduser(args.data_folder), data['name']))
+        dataset_indices.extend([idx]*data['weight'])
+
+    # Start producer
+    p = mp.Process(target=produce_data, args=(args, queue, filepaths, dataset_indices))
+    p.start()
+
+    # Run training
+    print("Start processes:", args.nprocs)
+    xmp.spawn(train_function, args=(args, queue), nprocs=args.nprocs, start_method='fork')
+    print("Training done")
+    print("It might be that not all processes exit automatically. In that case you must manually kill this process.")
+    print("With 'pkill python' you can kill all remaining python processes")
+    p.kill()
+    exit()
+
+
+
+# Script was called via:
+#python train_many_data_files_v2.py --steps 1000000 --batch_size 128 --model nreimers/MiniLM-L6-H384-uncased train_data_configs/all_datasets_v4.json output/all_datasets_v4_MiniLM-L6-H384-uncased-batch128