fix: bump clients test base url to llama (huggingface#1751)

This PR bumps the client tests from `google/flan-t5-xxl` to
`meta-llama/Llama-2-7b-chat-hf` to resolve issues when calling the
endpoint and `google/flan-t5-xxl` is not available

run with
```bash
make python-client-tests

clients/python/tests/test_client.py ..............     [ 43%]
clients/python/tests/test_errors.py ..........         [ 75%]
clients/python/tests/test_inference_api.py ......      [ 93%]
clients/python/tests/test_types.py ..                  [100%]
```

**note `google/flan-t5-xxl` function is currently unused but still
included in the `conftest.py`

clients/python/tests/conftest.py

@@ -9,6 +9,11 @@ def flan_t5_xxl():
     return "google/flan-t5-xxl"
 
 
+@pytest.fixture
+def llama_7b():
+    return "meta-llama/Llama-2-7b-chat-hf"
+
+
 @pytest.fixture
 def fake_model():
     return "fake/model"
@@ -34,6 +39,11 @@ def flan_t5_xxl_url(base_url, flan_t5_xxl):
     return f"{base_url}/{flan_t5_xxl}"
 
 
+@pytest.fixture
+def llama_7b_url(base_url, llama_7b):
+    return f"{base_url}/{llama_7b}"
+
+
 @pytest.fixture
 def fake_url(base_url, fake_model):
     return f"{base_url}/{fake_model}"

clients/python/tests/test_client.py

@@ -5,24 +5,24 @@
 from text_generation.types import FinishReason, InputToken
 
 
-def test_generate(flan_t5_xxl_url, hf_headers):
-    client = Client(flan_t5_xxl_url, hf_headers)
+def test_generate(llama_7b_url, hf_headers):
+    client = Client(llama_7b_url, hf_headers)
     response = client.generate("test", max_new_tokens=1, decoder_input_details=True)
 
-    assert response.generated_text == ""
+    assert response.generated_text == "_"
     assert response.details.finish_reason == FinishReason.Length
     assert response.details.generated_tokens == 1
     assert response.details.seed is None
-    assert len(response.details.prefill) == 1
-    assert response.details.prefill[0] == InputToken(id=0, text="<pad>", logprob=None)
+    assert len(response.details.prefill) == 2
+    assert response.details.prefill[0] == InputToken(id=1, text="<s>", logprob=None)
     assert len(response.details.tokens) == 1
-    assert response.details.tokens[0].id == 3
-    assert response.details.tokens[0].text == " "
+    assert response.details.tokens[0].id == 29918
+    assert response.details.tokens[0].text == "_"
     assert not response.details.tokens[0].special
 
 
-def test_generate_best_of(flan_t5_xxl_url, hf_headers):
-    client = Client(flan_t5_xxl_url, hf_headers)
+def test_generate_best_of(llama_7b_url, hf_headers):
+    client = Client(llama_7b_url, hf_headers)
     response = client.generate(
         "test", max_new_tokens=1, best_of=2, do_sample=True, decoder_input_details=True
     )
@@ -39,22 +39,22 @@ def test_generate_not_found(fake_url, hf_headers):
         client.generate("test")
 
 
-def test_generate_validation_error(flan_t5_xxl_url, hf_headers):
-    client = Client(flan_t5_xxl_url, hf_headers)
+def test_generate_validation_error(llama_7b_url, hf_headers):
+    client = Client(llama_7b_url, hf_headers)
     with pytest.raises(ValidationError):
         client.generate("test", max_new_tokens=10_000)
 
 
-def test_generate_stream(flan_t5_xxl_url, hf_headers):
-    client = Client(flan_t5_xxl_url, hf_headers)
+def test_generate_stream(llama_7b_url, hf_headers):
+    client = Client(llama_7b_url, hf_headers)
     responses = [
         response for response in client.generate_stream("test", max_new_tokens=1)
     ]
 
     assert len(responses) == 1
     response = responses[0]
 
-    assert response.generated_text == ""
+    assert response.generated_text == "_"
     assert response.details.finish_reason == FinishReason.Length
     assert response.details.generated_tokens == 1
     assert response.details.seed is None
@@ -66,34 +66,37 @@ def test_generate_stream_not_found(fake_url, hf_headers):
         list(client.generate_stream("test"))
 
 
-def test_generate_stream_validation_error(flan_t5_xxl_url, hf_headers):
-    client = Client(flan_t5_xxl_url, hf_headers)
+def test_generate_stream_validation_error(llama_7b_url, hf_headers):
+    client = Client(llama_7b_url, hf_headers)
     with pytest.raises(ValidationError):
         list(client.generate_stream("test", max_new_tokens=10_000))
 
 
 @pytest.mark.asyncio
-async def test_generate_async(flan_t5_xxl_url, hf_headers):
-    client = AsyncClient(flan_t5_xxl_url, hf_headers)
+async def test_generate_async(llama_7b_url, hf_headers):
+    client = AsyncClient(llama_7b_url, hf_headers)
     response = await client.generate(
         "test", max_new_tokens=1, decoder_input_details=True
     )
 
-    assert response.generated_text == ""
+    assert response.generated_text == "_"
     assert response.details.finish_reason == FinishReason.Length
     assert response.details.generated_tokens == 1
     assert response.details.seed is None
-    assert len(response.details.prefill) == 1
-    assert response.details.prefill[0] == InputToken(id=0, text="<pad>", logprob=None)
+    assert len(response.details.prefill) == 2
+    assert response.details.prefill[0] == InputToken(id=1, text="<s>", logprob=None)
+    assert response.details.prefill[1] == InputToken(
+        id=1243, text="test", logprob=-10.96875
+    )
     assert len(response.details.tokens) == 1
-    assert response.details.tokens[0].id == 3
-    assert response.details.tokens[0].text == " "
+    assert response.details.tokens[0].id == 29918
+    assert response.details.tokens[0].text == "_"
     assert not response.details.tokens[0].special
 
 
 @pytest.mark.asyncio
-async def test_generate_async_best_of(flan_t5_xxl_url, hf_headers):
-    client = AsyncClient(flan_t5_xxl_url, hf_headers)
+async def test_generate_async_best_of(llama_7b_url, hf_headers):
+    client = AsyncClient(llama_7b_url, hf_headers)
     response = await client.generate(
         "test", max_new_tokens=1, best_of=2, do_sample=True, decoder_input_details=True
     )
@@ -112,23 +115,23 @@ async def test_generate_async_not_found(fake_url, hf_headers):
 
 
 @pytest.mark.asyncio
-async def test_generate_async_validation_error(flan_t5_xxl_url, hf_headers):
-    client = AsyncClient(flan_t5_xxl_url, hf_headers)
+async def test_generate_async_validation_error(llama_7b_url, hf_headers):
+    client = AsyncClient(llama_7b_url, hf_headers)
     with pytest.raises(ValidationError):
         await client.generate("test", max_new_tokens=10_000)
 
 
 @pytest.mark.asyncio
-async def test_generate_stream_async(flan_t5_xxl_url, hf_headers):
-    client = AsyncClient(flan_t5_xxl_url, hf_headers)
+async def test_generate_stream_async(llama_7b_url, hf_headers):
+    client = AsyncClient(llama_7b_url, hf_headers)
     responses = [
         response async for response in client.generate_stream("test", max_new_tokens=1)
     ]
 
     assert len(responses) == 1
     response = responses[0]
 
-    assert response.generated_text == ""
+    assert response.generated_text == "_"
     assert response.details.finish_reason == FinishReason.Length
     assert response.details.generated_tokens == 1
     assert response.details.seed is None
@@ -143,8 +146,8 @@ async def test_generate_stream_async_not_found(fake_url, hf_headers):
 
 
 @pytest.mark.asyncio
-async def test_generate_stream_async_validation_error(flan_t5_xxl_url, hf_headers):
-    client = AsyncClient(flan_t5_xxl_url, hf_headers)
+async def test_generate_stream_async_validation_error(llama_7b_url, hf_headers):
+    client = AsyncClient(llama_7b_url, hf_headers)
     with pytest.raises(ValidationError):
         async for _ in client.generate_stream("test", max_new_tokens=10_000):
             pass