0fd2f875
 tangwang
translate
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import torch
from translation.backends.local_seq2seq import MarianMTTranslationBackend, NLLBTranslationBackend
from translation.service import TranslationService
class _FakeBatch(dict):
def to(self, device):
self["device"] = device
return self
class _FakeTokenizer:
def __init__(self):
self.src_lang = None
self.pad_token = "</s>"
self.eos_token = "</s>"
self.lang_code_to_id = {"eng_Latn": 101, "zho_Hans": 202}
self.last_call = None
def __call__(self, texts, **kwargs):
self.last_call = {"texts": list(texts), **kwargs}
return _FakeBatch({"input_ids": torch.tensor([[1, 2, 3]])})
def batch_decode(self, generated, skip_special_tokens=True):
del generated, skip_special_tokens
return ["translated" for _ in range(len(self.last_call["texts"]))]
def convert_tokens_to_ids(self, token):
return self.lang_code_to_id[token]
class _FakeModel:
def to(self, device):
self.device = device
return self
def eval(self):
return self
def generate(self, **kwargs):
self.last_generate_kwargs = kwargs
return [[42]]
def _stub_load_model(self):
self.tokenizer = _FakeTokenizer()
self.seq2seq_model = _FakeModel()
def test_marian_language_validation(monkeypatch):
monkeypatch.setattr(MarianMTTranslationBackend, "_load_model", _stub_load_model)
backend = MarianMTTranslationBackend(
name="opus-mt-zh-en",
model_id="Helsinki-NLP/opus-mt-zh-en",
model_dir="./models/translation/Helsinki-NLP/opus-mt-zh-en",
device="cpu",
torch_dtype="float32",
batch_size=1,
max_input_length=16,
max_new_tokens=16,
num_beams=1,
source_langs=["zh"],
target_langs=["en"],
)
result = backend.translate("测试", source_lang="zh", target_lang="en")
assert result == "translated"
try:
backend.translate("test", source_lang="en", target_lang="zh")
except ValueError as exc:
assert "source languages" in str(exc)
else:
raise AssertionError("Expected unsupported source language to raise")
def test_nllb_uses_src_lang_and_forced_bos(monkeypatch):
monkeypatch.setattr(NLLBTranslationBackend, "_load_model", _stub_load_model)
backend = NLLBTranslationBackend(
name="nllb-200-distilled-600m",
model_id="facebook/nllb-200-distilled-600M",
model_dir="./models/translation/facebook/nllb-200-distilled-600M",
device="cpu",
torch_dtype="float32",
batch_size=1,
max_input_length=16,
max_new_tokens=16,
num_beams=1,
)
result = backend.translate("test", source_lang="en", target_lang="zh")
assert result == "translated"
assert backend.tokenizer.src_lang == "eng_Latn"
assert backend.seq2seq_model.last_generate_kwargs["forced_bos_token_id"] == 202
def test_translation_service_lazy_loads_enabled_backends(monkeypatch):
created = []
def _fake_create_backend(self, *, name, backend_type, cfg):
del self, cfg
created.append((name, backend_type))
class _Backend:
model = name
@property
def supports_batch(self):
return True
def translate(self, text, target_lang, source_lang=None, scene=None):
del target_lang, source_lang, scene
return text
return _Backend()
monkeypatch.setattr(TranslationService, "_create_backend", _fake_create_backend)
config = {
"service_url": "http://127.0.0.1:6006",
"timeout_sec": 10.0,
"default_model": "opus-mt-en-zh",
"default_scene": "general",
"capabilities": {
"opus-mt-en-zh": {
"enabled": True,
"backend": "local_marian",
"model_id": "dummy",
"model_dir": "dummy",
"device": "cpu",
"torch_dtype": "float32",
"batch_size": 1,
"max_input_length": 8,
"max_new_tokens": 8,
"num_beams": 1,
},
"nllb-200-distilled-600m": {
"enabled": True,
"backend": "local_nllb",
"model_id": "dummy",
"model_dir": "dummy",
"device": "cpu",
"torch_dtype": "float32",
"batch_size": 1,
"max_input_length": 8,
"max_new_tokens": 8,
"num_beams": 1,
},
},
"cache": {
"enabled": True,
"key_prefix": "trans:v2",
"ttl_seconds": 60,
"sliding_expiration": True,
"key_include_scene": True,
"key_include_source_lang": True,
},
}
service = TranslationService(config)
assert service.available_models == ["opus-mt-en-zh", "nllb-200-distilled-600m"]
assert service.loaded_models == []
backend = service.get_backend("opus-mt-en-zh")
assert backend.model == "opus-mt-en-zh"
assert created == [("opus-mt-en-zh", "local_marian")]
assert service.loaded_models == ["opus-mt-en-zh"]
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