Re-org the ocr agent files

src/layoutparser/ocr/__init__.py

@@ -0,0 +1,2 @@
+from .gcv_agent import GCVAgent, GCVFeatureType
+from .tesseract_agent import TesseractAgent, TesseractFeatureType

src/layoutparser/ocr/base.py

@@ -0,0 +1,67 @@
+from abc import ABC, abstractmethod
+from enum import IntEnum
+import importlib
+
+
+class BaseOCRElementType(IntEnum):
+    @property
+    @abstractmethod
+    def attr_name(self):
+        pass
+
+
+class BaseOCRAgent(ABC):
+    @property
+    @abstractmethod
+    def DEPENDENCIES(self):
+        """DEPENDENCIES lists all necessary dependencies for the class."""
+        pass
+
+    @property
+    @abstractmethod
+    def MODULES(self):
+        """MODULES instructs how to import these necessary libraries.
+
+        Note:
+            Sometimes a python module have different installation name and module name (e.g.,
+            `pip install tensorflow-gpu` when installing and `import tensorflow` when using
+            ). And sometimes we only need to import a submodule but not whole module. MODULES
+            is designed for this purpose.
+
+        Returns:
+            :obj: list(dict): A list of dict indicate how the model is imported.
+
+                Example::
+
+                    [{
+                        "import_name": "_vision",
+                        "module_path": "google.cloud.vision"
+                    }]
+
+                    is equivalent to self._vision = importlib.import_module("google.cloud.vision")
+        """
+        pass
+
+    @classmethod
+    def _import_module(cls):
+        for m in cls.MODULES:
+            if importlib.util.find_spec(m["module_path"]):
+                setattr(
+                    cls, m["import_name"], importlib.import_module(m["module_path"])
+                )
+            else:
+                raise ModuleNotFoundError(
+                    f"\n "
+                    f"\nPlease install the following libraries to support the class {cls.__name__}:"
+                    f"\n    pip install {' '.join(cls.DEPENDENCIES)}"
+                    f"\n "
+                )
+
+    def __new__(cls, *args, **kwargs):
+
+        cls._import_module()
+        return super().__new__(cls)
+
+    @abstractmethod
+    def detect(self, image):
+        pass

src/layoutparser/ocr.py → src/layoutparser/ocr/gcv_agent.py

@@ -1,91 +1,19 @@
-from abc import ABC, abstractmethod
-from enum import IntEnum
-import importlib
 import io
 import os
 import json
-import csv
 import warnings
-import pickle
 
 import numpy as np
-import pandas as pd
 from cv2 import imencode
 
-from .elements import *
-from .io import load_dataframe
-
-__all__ = ["GCVFeatureType", "GCVAgent", "TesseractFeatureType", "TesseractAgent"]
+from .base import BaseOCRAgent, BaseOCRElementType
+from ..elements import Layout, TextBlock, Quadrilateral, TextBlock
 
 
 def _cvt_GCV_vertices_to_points(vertices):
     return np.array([[vertex.x, vertex.y] for vertex in vertices])
 
 
-class BaseOCRElementType(IntEnum):
-    @property
-    @abstractmethod
-    def attr_name(self):
-        pass
-
-
-class BaseOCRAgent(ABC):
-    @property
-    @abstractmethod
-    def DEPENDENCIES(self):
-        """DEPENDENCIES lists all necessary dependencies for the class."""
-        pass
-
-    @property
-    @abstractmethod
-    def MODULES(self):
-        """MODULES instructs how to import these necessary libraries.
-
-        Note:
-            Sometimes a python module have different installation name and module name (e.g.,
-            `pip install tensorflow-gpu` when installing and `import tensorflow` when using
-            ). And sometimes we only need to import a submodule but not whole module. MODULES
-            is designed for this purpose.
-
-        Returns:
-            :obj: list(dict): A list of dict indicate how the model is imported.
-
-                Example::
-
-                    [{
-                        "import_name": "_vision",
-                        "module_path": "google.cloud.vision"
-                    }]
-
-                    is equivalent to self._vision = importlib.import_module("google.cloud.vision")
-        """
-        pass
-
-    @classmethod
-    def _import_module(cls):
-        for m in cls.MODULES:
-            if importlib.util.find_spec(m["module_path"]):
-                setattr(
-                    cls, m["import_name"], importlib.import_module(m["module_path"])
-                )
-            else:
-                raise ModuleNotFoundError(
-                    f"\n "
-                    f"\nPlease install the following libraries to support the class {cls.__name__}:"
-                    f"\n    pip install {' '.join(cls.DEPENDENCIES)}"
-                    f"\n "
-                )
-
-    def __new__(cls, *args, **kwargs):
-
-        cls._import_module()
-        return super().__new__(cls)
-
-    @abstractmethod
-    def detect(self, image):
-        pass
-
-
 class GCVFeatureType(BaseOCRElementType):
     """
     The element types from Google Cloud Vision API
@@ -341,166 +269,4 @@ def save_response(self, res, file_name):
 
         with open(file_name, "w") as f:
             json_file = json.loads(res)
-            json.dump(json_file, f)
-
-
-class TesseractFeatureType(BaseOCRElementType):
-    """
-    The element types for Tesseract Detection API
-    """
-
-    PAGE = 0
-    BLOCK = 1
-    PARA = 2
-    LINE = 3
-    WORD = 4
-
-    @property
-    def attr_name(self):
-        name_cvt = {
-            TesseractFeatureType.PAGE: "page_num",
-            TesseractFeatureType.BLOCK: "block_num",
-            TesseractFeatureType.PARA: "par_num",
-            TesseractFeatureType.LINE: "line_num",
-            TesseractFeatureType.WORD: "word_num",
-        }
-        return name_cvt[self]
-
-    @property
-    def group_levels(self):
-        levels = ["page_num", "block_num", "par_num", "line_num", "word_num"]
-        return levels[: self + 1]
-
-
-class TesseractAgent(BaseOCRAgent):
-    """
-    A wrapper for `Tesseract <https://github.com/tesseract-ocr/tesseract>`_ Text
-    Detection APIs based on `PyTesseract <https://github.com/tesseract-ocr/tesseract>`_.
-    """
-
-    DEPENDENCIES = ["pytesseract"]
-    MODULES = [{"import_name": "_pytesseract", "module_path": "pytesseract"}]
-
-    def __init__(self, languages="eng", **kwargs):
-        """Create a Tesseract OCR Agent.
-
-        Args:
-            languages (:obj:`list` or :obj:`str`, optional):
-                You can specify the language code(s) of the documents to detect to improve
-                accuracy. The supported language and their code can be found on
-                `its github repo <https://github.com/tesseract-ocr/langdata>`_.
-                It supports two formats: 1) you can pass in the languages code as a string
-                of format like `"eng+fra"`, or 2) you can pack them as a list of strings
-                `["eng", "fra"]`.
-                Defaults to 'eng'.
-        """
-        self.lang = languages if isinstance(languages, str) else "+".join(languages)
-        self.configs = kwargs
-
-    @classmethod
-    def with_tesseract_executable(cls, tesseract_cmd_path, **kwargs):
-
-        cls._pytesseract.pytesseract.tesseract_cmd = tesseract_cmd_path
-        return cls(**kwargs)
-
-    def _detect(self, img_content):
-        res = {}
-        res["text"] = self._pytesseract.image_to_string(
-            img_content, lang=self.lang, **self.configs
-        )
-        _data = self._pytesseract.image_to_data(
-            img_content, lang=self.lang, **self.configs
-        )
-        res["data"] = pd.read_csv(
-            io.StringIO(_data), quoting=csv.QUOTE_NONE, encoding="utf-8", sep="\t"
-        )
-        return res
-
-    def detect(
-        self, image, return_response=False, return_only_text=True, agg_output_level=None
-    ):
-        """Send the input image for OCR.
-
-        Args:
-            image (:obj:`np.ndarray` or :obj:`str`):
-                The input image array or the name of the image file
-            return_response (:obj:`bool`, optional):
-                Whether directly return all output (string and boxes
-                info) from Tesseract.
-                Defaults to `False`.
-            return_only_text (:obj:`bool`, optional):
-                Whether return only the texts in the OCR results.
-                Defaults to `False`.
-            agg_output_level (:obj:`~TesseractFeatureType`, optional):
-                When set, aggregate the GCV output with respect to the
-                specified aggregation level. Defaults to `None`.
-        """
-
-        res = self._detect(image)
-
-        if return_response:
-            return res
-
-        if return_only_text:
-            return res["text"]
-
-        if agg_output_level is not None:
-            return self.gather_data(res, agg_output_level)
-
-        return res["text"]
-
-    @staticmethod
-    def gather_data(response, agg_level):
-        """
-        Gather the OCR'ed text, bounding boxes, and confidence
-        in a given aggeragation level.
-        """
-        assert isinstance(
-            agg_level, TesseractFeatureType
-        ), f"Invalid agg_level {agg_level}"
-        res = response["data"]
-        df = (
-            res[~res.text.isna()]
-            .groupby(agg_level.group_levels)
-            .apply(
-                lambda gp: pd.Series(
-                    [
-                        gp["left"].min(),
-                        gp["top"].min(),
-                        gp["width"].max(),
-                        gp["height"].max(),
-                        gp["conf"].mean(),
-                        gp["text"].str.cat(sep=" "),
-                    ]
-                )
-            )
-            .reset_index(drop=True)
-            .reset_index()
-            .rename(
-                columns={
-                    0: "x_1",
-                    1: "y_1",
-                    2: "w",
-                    3: "h",
-                    4: "score",
-                    5: "text",
-                    "index": "id",
-                }
-            )
-            .assign(x_2=lambda x: x.x_1 + x.w, y_2=lambda x: x.y_1 + x.h, block_type="rectangle")
-            .drop(columns=["w", "h"])
-        )
-
-        return load_dataframe(df)
-
-    @staticmethod
-    def load_response(filename):
-        with open(filename, "rb") as fp:
-            res = pickle.load(fp)
-        return res
-
-    @staticmethod
-    def save_response(res, file_name):
-
-        with open(file_name, "wb") as fp:
-            pickle.dump(res, fp, protocol=pickle.HIGHEST_PROTOCOL)
+            json.dump(json_file, f)