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Tests for domainTokenizer Phase 2C: Pre-training Pipeline.
19 tests covering tokenization, packing, collation, integration, and Trainer smoke test.
Run: pytest tests/test_training.py -v
"""
import logging
import random
from datetime import datetime, timedelta
from typing import Any, Dict, List
import numpy as np
import torch
import pytest
from datasets import Dataset as HFDataset
from transformers import DataCollatorForLanguageModeling
from domain_tokenizer.schemas.predefined import FINANCE_SCHEMA
from domain_tokenizer.tokenizers.domain_tokenizer import DomainTokenizerBuilder
from domain_tokenizer.models.configuration import DomainTransformerConfig
from domain_tokenizer.models.modeling import DomainTransformerForCausalLM
from domain_tokenizer.training.data_pipeline import (
tokenize_user_sequences, pack_sequences, prepare_clm_dataset,
)
from domain_tokenizer.training.pretrain import pretrain_domain_model
logging.basicConfig(level=logging.INFO)
def make_finance_events(n_events=10, seed=42):
rng = random.Random(seed)
merchants = ["AMAZON", "UBER", "SALARY", "GROCERY", "NETFLIX", "GAS", "RESTAURANT", "PHARMACY"]
base_date = datetime(2025, 1, 1)
return [
{"amount_sign": (amt := rng.uniform(5, 5000) * rng.choice([1, -1])),
"amount": amt,
"timestamp": base_date + timedelta(days=rng.randint(0, 365), hours=rng.randint(0, 23)),
"description": rng.choice(merchants)}
for _ in range(n_events)
]
def make_user_sequences(n_users=20, min_events=5, max_events=30, seed=42):
rng = random.Random(seed)
return [make_finance_events(rng.randint(min_events, max_events), seed + i) for i in range(n_users)]
def build_finance_tokenizer(events_flat):
builder = DomainTokenizerBuilder(FINANCE_SCHEMA)
builder.fit(events_flat)
text_corpus = list(set(e["description"] for e in events_flat)) * 20
return builder, builder.build(text_corpus=text_corpus, bpe_vocab_size=500)
class TestTokenizeUserSequences:
@pytest.fixture
def setup(self):
seqs = make_user_sequences(5, 3, 10)
flat = [e for s in seqs for e in s]
b, t = build_finance_tokenizer(flat)
return seqs, b, t
def test_returns_list_of_lists(self, setup):
seqs, b, t = setup
r = tokenize_user_sequences(seqs, b, t)
assert len(r) == 5 and all(isinstance(s, list) for s in r)
def test_variable_lengths(self, setup):
seqs, b, t = setup
r = tokenize_user_sequences(seqs, b, t)
assert len(set(len(s) for s in r)) > 1
def test_bos_eos_present(self, setup):
seqs, b, t = setup
r = tokenize_user_sequences(seqs, b, t, add_bos=True, add_eos=True)
bos = t.convert_tokens_to_ids("[BOS]")
assert all(bos in s[:5] for s in r)
def test_no_bos_eos(self, setup):
seqs, b, t = setup
with_ = tokenize_user_sequences(seqs[:1], b, t, add_bos=True, add_eos=True)
without = tokenize_user_sequences(seqs[:1], b, t, add_bos=False, add_eos=False)
assert len(without[0]) < len(with_[0])
class TestPackSequences:
def test_fixed_length(self):
ds = pack_sequences([[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14, 15]], block_size=5)
assert len(ds) == 3 and all(len(r["input_ids"]) == 5 for r in ds)
def test_concat(self):
ds = pack_sequences([[1, 2, 3], [4, 5, 6]], block_size=3)
assert ds[0]["input_ids"] == [1, 2, 3] and ds[1]["input_ids"] == [4, 5, 6]
def test_drops_remainder(self):
ds = pack_sequences([[1, 2, 3, 4, 5, 6, 7]], block_size=3)
assert len(ds) == 2
def test_too_few(self):
with pytest.raises(ValueError):
pack_sequences([[1, 2]], block_size=10)
def test_hf_dataset(self):
assert isinstance(pack_sequences([[i for i in range(100)]], block_size=10), HFDataset)
def test_no_padding(self):
ds = pack_sequences([[i for i in range(50)] for _ in range(10)], block_size=25)
assert all(len(r["input_ids"]) == 25 for r in ds)
class TestPrepareCLMDataset:
def test_full(self):
seqs = make_user_sequences(10, 5, 15)
flat = [e for s in seqs for e in s]
b, t = build_finance_tokenizer(flat)
ds = prepare_clm_dataset(seqs, b, t, block_size=64)
assert len(ds) > 0 and all(len(r["input_ids"]) == 64 for r in ds)
def test_block_sizes(self):
seqs = make_user_sequences(10, 10, 20)
flat = [e for s in seqs for e in s]
b, t = build_finance_tokenizer(flat)
ds32 = prepare_clm_dataset(seqs, b, t, block_size=32)
ds64 = prepare_clm_dataset(seqs, b, t, block_size=64)
assert len(ds32) > len(ds64)
class TestDataCollator:
@pytest.fixture
def setup(self):
seqs = make_user_sequences(5, 5, 15)
flat = [e for s in seqs for e in s]
b, t = build_finance_tokenizer(flat)
ds = prepare_clm_dataset(seqs, b, t, block_size=32)
return ds, DataCollatorForLanguageModeling(tokenizer=t, mlm=False), t
def test_adds_labels(self, setup):
ds, c, _ = setup
batch = c([ds[i] for i in range(min(4, len(ds)))])
assert all(k in batch for k in ["input_ids", "labels", "attention_mask"])
def test_labels_eq_ids(self, setup):
ds, c, _ = setup
batch = c([ds[0]])
assert torch.equal(batch["input_ids"], batch["labels"])
def test_shapes(self, setup):
ds, c, _ = setup
n = min(4, len(ds))
batch = c([ds[i] for i in range(n)])
assert batch["input_ids"].shape == (n, 32)
def test_all_ones_mask(self, setup):
ds, c, _ = setup
batch = c([ds[0]])
assert batch["attention_mask"].sum() == 32
class TestTrainingIntegration:
def test_forward(self):
seqs = make_user_sequences(10, 5, 15)
flat = [e for s in seqs for e in s]
b, t = build_finance_tokenizer(flat)
ds = prepare_clm_dataset(seqs, b, t, block_size=32)
c = DataCollatorForLanguageModeling(tokenizer=t, mlm=False)
batch = c([ds[i] for i in range(min(4, len(ds)))])
config = DomainTransformerConfig(vocab_size=t.vocab_size, hidden_size=64,
num_hidden_layers=2, num_attention_heads=4, intermediate_size=128)
model = DomainTransformerForCausalLM(config)
out = model(**batch)
assert out.loss.item() > 0
out.loss.backward()
assert sum(p.grad.norm().item() for p in model.parameters() if p.grad is not None) > 0
class TestPretrainDomainModel:
def test_smoke(self, tmp_path):
seqs = make_user_sequences(20, 5, 15)
flat = [e for s in seqs for e in s]
b, t = build_finance_tokenizer(flat)
ds = prepare_clm_dataset(seqs, b, t, block_size=32)
config = DomainTransformerConfig(vocab_size=t.vocab_size, hidden_size=64,
num_hidden_layers=2, num_attention_heads=4, intermediate_size=128)
model = DomainTransformerForCausalLM(config)
trainer = pretrain_domain_model(
model=model, tokenizer=t, train_dataset=ds,
output_dir=str(tmp_path / "ck"), hub_model_id=None,
num_epochs=1, per_device_batch_size=4, gradient_accumulation_steps=1,
learning_rate=1e-3, warmup_steps=0, logging_steps=1,
save_steps=999999, report_to="none", seed=42,
)
assert trainer.state.global_step > 0
def test_no_pad_raises(self, tmp_path):
from transformers import PreTrainedTokenizerFast
from tokenizers import Tokenizer
from tokenizers.models import BPE
hf = PreTrainedTokenizerFast(tokenizer_object=Tokenizer(BPE(unk_token="[UNK]")), unk_token="[UNK]")
config = DomainTransformerConfig(vocab_size=100, hidden_size=32, num_hidden_layers=1, num_attention_heads=2)
with pytest.raises(ValueError, match="pad_token"):
pretrain_domain_model(
model=DomainTransformerForCausalLM(config), tokenizer=hf,
train_dataset=HFDataset.from_dict({"input_ids": [[1, 2, 3]]}),
output_dir=str(tmp_path),
)
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