Allow local or remote ASR process

.env

@@ -8,7 +8,7 @@
 # The name of the project, used for API documentation.
 PROJECT_NAME="Wordcab Transcribe"
 # The version of the project, used for API documentation.
-VERSION="0.5.0"
+VERSION="0.5.1"
 # The description of the project, used for API documentation.
 DESCRIPTION="💬 ASR FastAPI server using faster-whisper and Auto-Tuning Spectral Clustering for diarization."
 # This API prefix is used for all endpoints in the API outside of the status and cortex endpoints.
@@ -60,6 +60,10 @@ MULTISCALE_WEIGHTS="1.0,1.0,1.0,1.0,1.0"
 # files are processed.
 # * `live` is the option to use when you want to process a live audio stream. It will process the audio in chunks,
 # and return the results as soon as they are available. Live option is still a feature in development.
+# * `only_transcription` is used to deploy a single transcription server.
+# This option is used when you want to deploy each service in a separate server.
+# * `only_diarization` is used to deploy a single diarization server.
+# This option is used when you want to deploy each service in a separate server.
 # Use `live` only if you need live results, otherwise, use `async`.
 ASR_TYPE="async"
 #
@@ -106,4 +110,17 @@ SVIX_API_KEY=
 # The svix_app_id parameter is used in the cortex implementation to enable webhooks.
 SVIX_APP_ID=
 #
+# -------------------------------------------------- REMOTE SERVERS -------------------------------------------------- #
+# The remote servers configuration is used to control the number of servers used to process the requests if you don't
+# want to group all the services in one server.
+#
+# The TRANSCRIBE_SERVER_URLS parameter is used to control the URLs of the servers used to process the requests.
+# Each url should be separated by a comma and have this format: "host:port".
+# e.g. SERVER_URLS="http://1.2.3.4:8000,http://4.3.2.1:8000"
+TRANSCRIBE_SERVER_URLS=
+# The DIARIZE_SERVER_URLS parameter is used to control the URLs of the servers used to process the requests.
+# Each url should be separated by a comma and have this format: "host:port".
+# e.g. SERVER_URLS="http://1.2.3.4:8000,http://4.3.2.1:8000"
+DIARIZE_SERVER_URLS=
+#
 # -------------------------------------------------------------------------------------------------------------------- #

src/wordcab_transcribe/config.py

@@ -20,12 +20,13 @@
 """Configuration module of the Wordcab Transcribe."""
 
 from os import getenv
-from typing import Dict, List
+from typing import Dict, List, Union
 
 from dotenv import load_dotenv
 from loguru import logger
 from pydantic import field_validator
 from pydantic.dataclasses import dataclass
+from typing_extensions import Literal
 
 from wordcab_transcribe import __version__
 
@@ -44,14 +45,14 @@ class Settings:
     # Whisper
     whisper_model: str
     compute_type: str
-    extra_languages: List[str]
-    extra_languages_model_paths: Dict[str, str]
+    extra_languages: Union[List[str], None]
+    extra_languages_model_paths: Union[Dict[str, str], None]
     # Diarization
     window_lengths: List[float]
     shift_lengths: List[float]
     multiscale_weights: List[float]
     # ASR type configuration
-    asr_type: str
+    asr_type: Literal["async", "live", "only_transcription", "only_diarization"]
     # Endpoints configuration
     audio_file_endpoint: bool
     audio_url_endpoint: bool
@@ -69,6 +70,9 @@ class Settings:
     # Svix configuration
     svix_api_key: str
     svix_app_id: str
+    # Remote servers configuration
+    transcribe_server_urls: Union[List[str], None]
+    diarize_server_urls: Union[List[str], None]
 
     @field_validator("project_name")
     def project_name_must_not_be_none(cls, value: str):  # noqa: B902, N805
@@ -213,29 +217,46 @@ def __post_init__(self):
 # Extra languages
 _extra_languages = getenv("EXTRA_LANGUAGES", None)
 if _extra_languages is not None and _extra_languages != "":
-    extra_languages = _extra_languages.split(",")
+    extra_languages = [lang.strip() for lang in _extra_languages.split(",")]
 else:
-    extra_languages = []
+    extra_languages = None
+
+extra_languages_model_paths = (
+    {lang: "" for lang in extra_languages} if extra_languages is not None else None
+)
 
 # Diarization scales
 _window_lengths = getenv("WINDOW_LENGTHS", None)
 if _window_lengths is not None:
-    window_lengths = [float(x) for x in _window_lengths.split(",")]
+    window_lengths = [float(x.strip()) for x in _window_lengths.split(",")]
 else:
     window_lengths = [1.5, 1.25, 1.0, 0.75, 0.5]
 
 _shift_lengths = getenv("SHIFT_LENGTHS", None)
 if _shift_lengths is not None:
-    shift_lengths = [float(x) for x in _shift_lengths.split(",")]
+    shift_lengths = [float(x.strip()) for x in _shift_lengths.split(",")]
 else:
     shift_lengths = [0.75, 0.625, 0.5, 0.375, 0.25]
 
 _multiscale_weights = getenv("MULTISCALE_WEIGHTS", None)
 if _multiscale_weights is not None:
-    multiscale_weights = [float(x) for x in _multiscale_weights.split(",")]
+    multiscale_weights = [float(x.strip()) for x in _multiscale_weights.split(",")]
 else:
     multiscale_weights = [1.0, 1.0, 1.0, 1.0, 1.0]
 
+# Multi-servers configuration
+_transcribe_server_urls = getenv("TRANSCRIBE_SERVER_URLS", None)
+if _transcribe_server_urls is not None and _transcribe_server_urls != "":
+    transcribe_server_urls = [url.strip() for url in _transcribe_server_urls.split(",")]
+else:
+    transcribe_server_urls = None
+
+_diarize_server_urls = getenv("DIARIZE_SERVER_URLS", None)
+if _diarize_server_urls is not None and _diarize_server_urls != "":
+    diarize_server_urls = [url.strip() for url in _diarize_server_urls.split(",")]
+else:
+    diarize_server_urls = None
+
 settings = Settings(
     # General configuration
     project_name=getenv("PROJECT_NAME", "Wordcab Transcribe"),
@@ -252,7 +273,7 @@ def __post_init__(self):
     whisper_model=getenv("WHISPER_MODEL", "large-v2"),
     compute_type=getenv("COMPUTE_TYPE", "float16"),
     extra_languages=extra_languages,
-    extra_languages_model_paths={lang: "" for lang in extra_languages},
+    extra_languages_model_paths=extra_languages_model_paths,
     # Diarization
     window_lengths=window_lengths,
     shift_lengths=shift_lengths,
@@ -276,4 +297,7 @@ def __post_init__(self):
     # Svix configuration
     svix_api_key=getenv("SVIX_API_KEY", ""),
     svix_app_id=getenv("SVIX_APP_ID", ""),
+    # Remote servers configuration
+    transcribe_server_urls=transcribe_server_urls,
+    diarize_server_urls=diarize_server_urls,
 )

src/wordcab_transcribe/dependencies.py

@@ -52,8 +52,14 @@
         multiscale_weights=settings.multiscale_weights,
         extra_languages=settings.extra_languages,
         extra_languages_model_paths=settings.extra_languages_model_paths,
+        transcribe_server_urls=settings.transcribe_server_urls,
+        diarize_server_urls=settings.diarize_server_urls,
         debug_mode=settings.debug,
     )
+elif settings.asr_type == "only_transcription":
+    asr = None
+elif settings.asr_type == "only_diarization":
+    asr = None
 else:
     raise ValueError(f"Invalid ASR type: {settings.asr_type}")
 
@@ -69,28 +75,29 @@ async def lifespan(app: FastAPI) -> None:
             " https://github.com/Wordcab/wordcab-transcribe/issues"
         )
 
-    if check_ffmpeg() is False:
-        logger.warning(
-            "FFmpeg is not installed on the host machine.\n"
-            "Please install it and try again: `sudo apt-get install ffmpeg`"
-        )
-        exit(1)
+    if settings.asr_type == "async" or settings.asr_type == "remote_transcribe":
+        if check_ffmpeg() is False:
+            logger.warning(
+                "FFmpeg is not installed on the host machine.\n"
+                "Please install it and try again: `sudo apt-get install ffmpeg`"
+            )
+            exit(1)
 
-    if settings.extra_languages:
-        logger.info("Downloading models for extra languages...")
-        for model in settings.extra_languages:
-            try:
-                model_path = download_model(
-                    compute_type=settings.compute_type, language=model
-                )
+        if settings.extra_languages is not None:
+            logger.info("Downloading models for extra languages...")
+            for model in settings.extra_languages:
+                try:
+                    model_path = download_model(
+                        compute_type=settings.compute_type, language=model
+                    )
 
-                if model_path is not None:
-                    settings.extra_languages_model_paths[model] = model_path
-                else:
-                    raise Exception(f"Coudn't download model for {model}")
+                    if model_path is not None:
+                        settings.extra_languages_model_paths[model] = model_path
+                    else:
+                        raise Exception(f"Coudn't download model for {model}")
 
-            except Exception as e:
-                logger.error(f"Error downloading model for {model}: {e}")
+                except Exception as e:
+                    logger.error(f"Error downloading model for {model}: {e}")
 
     logger.info("Warmup initialization...")
     await asr.inference_warmup()

src/wordcab_transcribe/main.py

@@ -55,7 +55,7 @@
 else:
     app.include_router(api_router, prefix=settings.api_prefix)
 
-if settings.cortex_endpoint:
+if settings.cortex_endpoint and settings.asr_type == "async":
     app.include_router(cortex_router, tags=["cortex"])
 
 

src/wordcab_transcribe/models.py

@@ -28,10 +28,10 @@
 class ProcessTimes(BaseModel):
     """The execution times of the different processes."""
 
-    total: float
-    transcription: float
-    diarization: Union[float, None]
-    post_processing: float
+    total: Union[float, None] = None
+    transcription: Union[float, None] = None
+    diarization: Union[float, None] = None
+    post_processing: Union[float, None] = None
 
 
 class Timestamps(str, Enum):
@@ -72,7 +72,7 @@ class BaseResponse(BaseModel):
     diarization: bool
     source_lang: str
     timestamps: str
-    vocab: List[str]
+    vocab: Union[List[str], None]
     word_timestamps: bool
     internal_vad: bool
     repetition_penalty: float
@@ -219,7 +219,7 @@ class CortexPayload(BaseModel):
     multi_channel: Optional[bool] = False
     source_lang: Optional[str] = "en"
     timestamps: Optional[Timestamps] = Timestamps.seconds
-    vocab: Optional[List[str]] = []
+    vocab: Union[List[str], None] = None
     word_timestamps: Optional[bool] = False
     internal_vad: Optional[bool] = False
     repetition_penalty: Optional[float] = 1.2
@@ -386,7 +386,7 @@ class BaseRequest(BaseModel):
     diarization: bool = False
     source_lang: str = "en"
     timestamps: Timestamps = Timestamps.seconds
-    vocab: List[str] = []
+    vocab: Union[List[str], None] = None
     word_timestamps: bool = False
     internal_vad: bool = False
     repetition_penalty: float = 1.2
@@ -397,10 +397,12 @@ class BaseRequest(BaseModel):
 
     @field_validator("vocab")
     def validate_each_vocab_value(
-        cls, value: List[str]  # noqa: B902, N805
+        cls, value: Union[List[str], None]  # noqa: B902, N805
     ) -> List[str]:
         """Validate the value of each vocab field."""
-        if not all(isinstance(v, str) for v in value):
+        if value == []:
+            return None
+        elif value is not None and not all(isinstance(v, str) for v in value):
             raise ValueError("`vocab` must be a list of strings.")
 
         return value
@@ -480,6 +482,14 @@ class Config:
         }
 
 
+class DiarizeResponse(BaseModel):
+    """Response model for the diarize endpoint."""
+
+
+class TranscribeResponse(BaseModel):
+    """Response model for the transcribe endpoint."""
+
+
 class Token(BaseModel):
     """Token model for authentication."""
 

src/wordcab_transcribe/pydantic_annotations.py

@@ -0,0 +1,72 @@
+# Copyright 2023 The Wordcab Team. All rights reserved.
+#
+# Licensed under the Wordcab Transcribe License 0.1 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://github.com/Wordcab/wordcab-transcribe/blob/main/LICENSE
+#
+# Except as expressly provided otherwise herein, and to the fullest
+# extent permitted by law, Licensor provides the Software (and each
+# Contributor provides its Contributions) AS IS, and Licensor
+# disclaims all warranties or guarantees of any kind, express or
+# implied, whether arising under any law or from any usage in trade,
+# or otherwise including but not limited to the implied warranties
+# of merchantability, non-infringement, quiet enjoyment, fitness
+# for a particular purpose, or otherwise.
+#
+# See the License for the specific language governing permissions
+# and limitations under the License.
+"""Custom Pydantic annotations for the Wordcab Transcribe API."""
+
+from typing import Any
+
+import torch
+from pydantic import GetCoreSchemaHandler, GetJsonSchemaHandler
+from pydantic.json_schema import JsonSchemaValue
+from pydantic_core import core_schema
+
+
+class TorchTensorPydanticAnnotation:
+    """Pydantic annotation for torch.Tensor."""
+
+    @classmethod
+    def __get_pydantic_core_schema__(
+        cls,
+        _source_type: Any,
+        _handler: GetCoreSchemaHandler,
+    ) -> core_schema.CoreSchema:
+        """Custom validation and serialization for torch.Tensor."""
+
+        def validate_tensor(value) -> torch.Tensor:
+            if not isinstance(value, torch.Tensor):
+                raise ValueError(f"Expected a torch.Tensor but got {type(value)}")
+            return value
+
+        return core_schema.chain_schema(
+            [
+                core_schema.no_info_plain_validator_function(validate_tensor),
+            ]
+        )
+
+    @classmethod
+    def __get_pydantic_json_schema__(
+        cls, _core_schema: core_schema.CoreSchema, handler: GetJsonSchemaHandler
+    ) -> JsonSchemaValue:
+        # This is a custom representation for the tensor in JSON Schema.
+        # Here, it represents a tensor as an object with metadata.
+        return {
+            "type": "object",
+            "properties": {
+                "dtype": {
+                    "type": "string",
+                    "description": "Data type of the tensor",
+                },
+                "shape": {
+                    "type": "array",
+                    "items": {"type": "integer"},
+                    "description": "Shape of the tensor",
+                },
+            },
+            "required": ["dtype", "shape"],
+        }