From e3005ab8b0a63efe85096aafe08bd459d83cf7a0 Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <me@steffo.eu>
Date: Wed, 8 Feb 2023 19:46:05 +0100
Subject: [PATCH] enough

---
 .idea/inspectionProfiles/Project_Default.xml  |   1 +
 .idea/misc.xml                                |   3 +
 .idea/runConfigurations/unimore_bda_6.xml     |   4 +-
 poetry.lock                                   |  57 ++++++++-
 pyproject.toml                                |   1 +
 unimore_bda_6/__main__.py                     | 117 +++++++++---------
 unimore_bda_6/analysis/base.py                |  65 ++++++----
 unimore_bda_6/analysis/nltk_sentiment.py      |  16 ++-
 unimore_bda_6/analysis/tf_text.py             |  43 +++++--
 unimore_bda_6/config.py                       |  50 ++++++--
 unimore_bda_6/database/cache.py               |   8 +-
 unimore_bda_6/database/connection.py          |   5 +-
 unimore_bda_6/database/datatypes.py           |   5 +
 unimore_bda_6/database/queries.py             |  26 ++--
 unimore_bda_6/log.py                          |   6 +-
 unimore_bda_6/tokenizer/__init__.py           |   2 +
 unimore_bda_6/tokenizer/base.py               |  12 +-
 unimore_bda_6/tokenizer/lower.py              |   6 +-
 unimore_bda_6/tokenizer/nltk_word_tokenize.py |   2 +-
 unimore_bda_6/tokenizer/plain.py              |  16 +++
 unimore_bda_6/tokenizer/potts.py              |  13 +-
 21 files changed, 309 insertions(+), 149 deletions(-)
 create mode 100644 unimore_bda_6/tokenizer/plain.py

diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index 7253287..1c6334f 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -40,6 +40,7 @@
           <option value="E501" />
           <option value="E221" />
           <option value="E203" />
+          <option value="E402" />
         </list>
       </option>
     </inspection_tool>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 6b0faad..a0e6536 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -10,4 +10,7 @@
   <component name="ProjectRootManager" version="2" languageLevel="JDK_19">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
+  <component name="PythonCompatibilityInspectionAdvertiser">
+    <option name="version" value="3" />
+  </component>
 </project>
\ No newline at end of file
diff --git a/.idea/runConfigurations/unimore_bda_6.xml b/.idea/runConfigurations/unimore_bda_6.xml
index 3718006..f2f821f 100644
--- a/.idea/runConfigurations/unimore_bda_6.xml
+++ b/.idea/runConfigurations/unimore_bda_6.xml
@@ -1,12 +1,12 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="unimore_bda_6" type="PythonConfigurationType" factoryName="Python" nameIsGenerated="true">
     <module name="unimore-bda-6" />
-    <option name="INTERPRETER_OPTIONS" value="" />
+    <option name="INTERPRETER_OPTIONS" value="-O" />
     <option name="PARENT_ENVS" value="true" />
     <envs>
+      <env name="PYTHONUNBUFFERED" value="1" />
       <env name="CONFIRM_OVERWRITE" value="False" />
       <env name="NLTK_DATA" value="./data/nltk" />
-      <env name="PYTHONUNBUFFERED" value="1" />
       <env name="TF_CPP_MIN_LOG_LEVEL" value="2" />
       <env name="WORKING_SET_SIZE" value="1000000" />
       <env name="XLA_FLAGS" value="--xla_gpu_cuda_data_dir=/opt/cuda" />
diff --git a/poetry.lock b/poetry.lock
index fb0f6ae..9ea263b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1230,6 +1230,61 @@ files = [
 [package.extras]
 tests = ["pytest", "pytest-cov"]
 
+[[package]]
+name = "tokenizers"
+version = "0.13.2"
+description = "Fast and Customizable Tokenizers"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "tokenizers-0.13.2-cp310-cp310-macosx_10_11_x86_64.whl", hash = "sha256:a6f36b1b499233bb4443b5e57e20630c5e02fba61109632f5e00dab970440157"},
+    {file = "tokenizers-0.13.2-cp310-cp310-macosx_12_0_arm64.whl", hash = "sha256:bc6983282ee74d638a4b6d149e5dadd8bc7ff1d0d6de663d69f099e0c6bddbeb"},
+    {file = "tokenizers-0.13.2-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:16756e6ab264b162f99c0c0a8d3d521328f428b33374c5ee161c0ebec42bf3c0"},
+    {file = "tokenizers-0.13.2-cp310-cp310-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:b10db6e4b036c78212c6763cb56411566edcf2668c910baa1939afd50095ce48"},
+    {file = "tokenizers-0.13.2-cp310-cp310-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:238e879d1a0f4fddc2ce5b2d00f219125df08f8532e5f1f2ba9ad42f02b7da59"},
+    {file = "tokenizers-0.13.2-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:47ef745dbf9f49281e900e9e72915356d69de3a4e4d8a475bda26bfdb5047736"},
+    {file = "tokenizers-0.13.2-cp310-cp310-win32.whl", hash = "sha256:96cedf83864bcc15a3ffd088a6f81a8a8f55b8b188eabd7a7f2a4469477036df"},
+    {file = "tokenizers-0.13.2-cp310-cp310-win_amd64.whl", hash = "sha256:eda77de40a0262690c666134baf19ec5c4f5b8bde213055911d9f5a718c506e1"},
+    {file = "tokenizers-0.13.2-cp311-cp311-macosx_10_11_universal2.whl", hash = "sha256:9eee037bb5aa14daeb56b4c39956164b2bebbe6ab4ca7779d88aa16b79bd4e17"},
+    {file = "tokenizers-0.13.2-cp311-cp311-macosx_12_0_arm64.whl", hash = "sha256:d1b079c4c9332048fec4cb9c2055c2373c74fbb336716a5524c9a720206d787e"},
+    {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a689654fc745135cce4eea3b15e29c372c3e0b01717c6978b563de5c38af9811"},
+    {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:3606528c07cda0566cff6cbfbda2b167f923661be595feac95701ffcdcbdbb21"},
+    {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:41291d0160946084cbd53c8ec3d029df3dc2af2673d46b25ff1a7f31a9d55d51"},
+    {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7892325f9ca1cc5fca0333d5bfd96a19044ce9b092ce2df625652109a3de16b8"},
+    {file = "tokenizers-0.13.2-cp311-cp311-win32.whl", hash = "sha256:93714958d4ebe5362d3de7a6bd73dc86c36b5af5941ebef6c325ac900fa58865"},
+    {file = "tokenizers-0.13.2-cp311-cp311-win_amd64.whl", hash = "sha256:fa7ef7ee380b1f49211bbcfac8a006b1a3fa2fa4c7f4ee134ae384eb4ea5e453"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-macosx_10_11_x86_64.whl", hash = "sha256:da521bfa94df6a08a6254bb8214ea04854bb9044d61063ae2529361688b5440a"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a739d4d973d422e1073989769723f3b6ad8b11e59e635a63de99aea4b2208188"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:cac01fc0b868e4d0a3aa7c5c53396da0a0a63136e81475d32fcf5c348fcb2866"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:0901a5c6538d2d2dc752c6b4bde7dab170fddce559ec75662cfad03b3187c8f6"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:3ba9baa76b5a3eefa78b6cc351315a216232fd727ee5e3ce0f7c6885d9fb531b"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-win32.whl", hash = "sha256:a537061ee18ba104b7f3daa735060c39db3a22c8a9595845c55b6c01d36c5e87"},
+    {file = "tokenizers-0.13.2-cp37-cp37m-win_amd64.whl", hash = "sha256:c82fb87b1cbfa984d8f05b2b3c3c73e428b216c1d4f0e286d0a3b27f521b32eb"},
+    {file = "tokenizers-0.13.2-cp38-cp38-macosx_10_11_x86_64.whl", hash = "sha256:ce298605a833ac7f81b8062d3102a42dcd9fa890493e8f756112c346339fe5c5"},
+    {file = "tokenizers-0.13.2-cp38-cp38-macosx_12_0_arm64.whl", hash = "sha256:f44d59bafe3d61e8a56b9e0a963075187c0f0091023120b13fbe37a87936f171"},
+    {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a51b93932daba12ed07060935978a6779593a59709deab04a0d10e6fd5c29e60"},
+    {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:6969e5ea7ccb909ce7d6d4dfd009115dc72799b0362a2ea353267168667408c4"},
+    {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:92f040c4d938ea64683526b45dfc81c580e3b35aaebe847e7eec374961231734"},
+    {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:4d3bc9f7d7f4c1aa84bb6b8d642a60272c8a2c987669e9bb0ac26daf0c6a9fc8"},
+    {file = "tokenizers-0.13.2-cp38-cp38-win32.whl", hash = "sha256:efbf189fb9cf29bd29e98c0437bdb9809f9de686a1e6c10e0b954410e9ca2142"},
+    {file = "tokenizers-0.13.2-cp38-cp38-win_amd64.whl", hash = "sha256:0b4cb2c60c094f31ea652f6cf9f349aae815f9243b860610c29a69ed0d7a88f8"},
+    {file = "tokenizers-0.13.2-cp39-cp39-macosx_10_11_x86_64.whl", hash = "sha256:b47d6212e7dd05784d7330b3b1e5a170809fa30e2b333ca5c93fba1463dec2b7"},
+    {file = "tokenizers-0.13.2-cp39-cp39-macosx_12_0_arm64.whl", hash = "sha256:80a57501b61ec4f94fb7ce109e2b4a1a090352618efde87253b4ede6d458b605"},
+    {file = "tokenizers-0.13.2-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:61507a9953f6e7dc3c972cbc57ba94c80c8f7f686fbc0876afe70ea2b8cc8b04"},
+    {file = "tokenizers-0.13.2-cp39-cp39-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:c09f4fa620e879debdd1ec299bb81e3c961fd8f64f0e460e64df0818d29d845c"},
+    {file = "tokenizers-0.13.2-cp39-cp39-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:66c892d85385b202893ac6bc47b13390909e205280e5df89a41086cfec76fedb"},
+    {file = "tokenizers-0.13.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:b3e306b0941ad35087ae7083919a5c410a6b672be0343609d79a1171a364ce79"},
+    {file = "tokenizers-0.13.2-cp39-cp39-win32.whl", hash = "sha256:79189e7f706c74dbc6b753450757af172240916d6a12ed4526af5cc6d3ceca26"},
+    {file = "tokenizers-0.13.2-cp39-cp39-win_amd64.whl", hash = "sha256:486d637b413fddada845a10a45c74825d73d3725da42ccd8796ccd7a1c07a024"},
+    {file = "tokenizers-0.13.2.tar.gz", hash = "sha256:f9525375582fd1912ac3caa2f727d36c86ff8c0c6de45ae1aaff90f87f33b907"},
+]
+
+[package.extras]
+dev = ["black (==22.3)", "datasets", "numpy", "pytest", "requests"]
+docs = ["setuptools-rust", "sphinx", "sphinx-rtd-theme"]
+testing = ["black (==22.3)", "datasets", "numpy", "pytest", "requests"]
+
 [[package]]
 name = "tqdm"
 version = "4.64.1"
@@ -1390,4 +1445,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "~3.10"
-content-hash = "b17bed73011c627355660e5ba5ca176a920c1d87915a1ab875e5a5ddd28a9dca"
+content-hash = "d63867d77886e8ae2c09771a5ec1053dae99a5699f7e905a69bd298e1b986a80"
diff --git a/pyproject.toml b/pyproject.toml
index 5ff07ae..9cb7937 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -137,6 +137,7 @@ nltk = "^3.8.1"
 cfig = {extras = ["cli"], version = "^0.3.0"}
 coloredlogs = "^15.0.1"
 tensorflow = "^2.11.0"
+tokenizers = "^0.13.2"
 
 
 
diff --git a/unimore_bda_6/__main__.py b/unimore_bda_6/__main__.py
index ea01232..121263a 100644
--- a/unimore_bda_6/__main__.py
+++ b/unimore_bda_6/__main__.py
@@ -1,84 +1,81 @@
 import logging
-import tensorflow
+import pymongo.errors
+from .log import install_log_handler
 
-from .config import config, DATA_SET_SIZE
-from .database import mongo_client_from_config, reviews_collection, sample_reviews_polar, sample_reviews_varied, store_cache, load_cache, delete_cache
+install_log_handler()
+
+from .config import config
+from .database import mongo_client_from_config, reviews_collection, sample_reviews_polar, sample_reviews_varied
 from .analysis.nltk_sentiment import NLTKSentimentAnalyzer
 from .analysis.tf_text import TensorflowSentimentAnalyzer
 from .analysis.base import TrainingFailedError
-from .tokenizer import LowercaseTokenizer
-from .log import install_log_handler
+from .tokenizer import PlainTokenizer, LowercaseTokenizer, NLTKWordTokenizer, PottsTokenizer, PottsTokenizerWithNegation
+from .gathering import Caches
 
 log = logging.getLogger(__name__)
 
 
 def main():
-    if len(tensorflow.config.list_physical_devices(device_type="GPU")) == 0:
-        log.warning("Tensorflow reports no GPU acceleration available.")
-    else:
-        log.debug("Tensorflow successfully found GPU acceleration!")
+    log.info("Started unimore-bda-6 in %s mode!", "DEBUG" if __debug__ else "PRODUCTION")
 
-    try:
-        delete_cache("./data/training")
-        delete_cache("./data/evaluation")
-    except FileNotFoundError:
-        pass
+    log.debug("Validating configuration...")
+    config.proxies.resolve()
 
-    for dataset_func in [sample_reviews_polar, sample_reviews_varied]:
-        for SentimentAnalyzer in [TensorflowSentimentAnalyzer, NLTKSentimentAnalyzer]:
-            for Tokenizer in [
-                # NLTKWordTokenizer,
-                # PottsTokenizer,
-                # PottsTokenizerWithNegation,
-                LowercaseTokenizer,
+    log.debug("Ensuring there are no leftover caches...")
+    Caches.ensure_clean()
+
+    with mongo_client_from_config() as db:
+        try:
+            db.admin.command("ping")
+        except pymongo.errors.ServerSelectionTimeoutError:
+            log.fatal("MongoDB database is not available, exiting...")
+            exit(1)
+
+        reviews = reviews_collection(db)
+
+        for sample_func in [sample_reviews_varied, sample_reviews_polar]:
+
+            for SentimentAnalyzer in [
+                TensorflowSentimentAnalyzer,
+                NLTKSentimentAnalyzer
             ]:
-                while True:
-                    try:
-                        tokenizer = Tokenizer()
-                        model = SentimentAnalyzer(tokenizer=tokenizer)
 
-                        with mongo_client_from_config() as db:
-                            log.debug("Finding the reviews MongoDB collection...")
-                            collection = reviews_collection(db)
+                for Tokenizer in [
+                    PlainTokenizer,
+                    LowercaseTokenizer,
+                    NLTKWordTokenizer,
+                    PottsTokenizer,
+                    PottsTokenizerWithNegation,
+                ]:
 
+                    slog = logging.getLogger(f"{__name__}.{sample_func.__name__}.{SentimentAnalyzer.__name__}.{Tokenizer.__name__}")
+
+                    while True:
+
+                        try:
+                            slog.debug("Creating sentiment analyzer...")
+                            sa = SentimentAnalyzer(tokenizer=Tokenizer())
+                        except TypeError:
+                            slog.warning("%s does not support %s, skipping...", Tokenizer.__name__, SentimentAnalyzer.__name__)
+                            break
+
+                        with Caches.from_database_samples(collection=reviews, sample_func=sample_func) as datasets:
                             try:
-                                training_cache = load_cache("./data/training")
-                                evaluation_cache = load_cache("./data/evaluation")
-                            except FileNotFoundError:
-                                log.debug("Gathering datasets...")
-                                reviews_training = dataset_func(collection=collection, amount=DATA_SET_SIZE.__wrapped__)
-                                reviews_evaluation = dataset_func(collection=collection, amount=DATA_SET_SIZE.__wrapped__)
+                                slog.info("Training sentiment analyzer: %s", sa)
+                                sa.train(training_dataset_func=datasets.training, validation_dataset_func=datasets.validation)
 
-                                log.debug("Caching datasets...")
-                                store_cache(reviews_training, "./data/training")
-                                store_cache(reviews_evaluation, "./data/evaluation")
-                                del reviews_training
-                                del reviews_evaluation
+                            except TrainingFailedError:
+                                slog.error("Training failed, trying again with a different dataset...")
+                                continue
 
-                                training_cache = load_cache("./data/training")
-                                evaluation_cache = load_cache("./data/evaluation")
-                                log.debug("Caches stored and loaded successfully!")
                             else:
-                                log.debug("Caches loaded successfully!")
+                                slog.info("Training succeeded!")
 
-                            log.info("Training model: %s", model)
-                            model.train(training_cache)
-                            log.info("Evaluating model: %s", model)
-                            evaluation_results = model.evaluate(evaluation_cache)
-                            log.info("%s", evaluation_results)
-
-                    except TrainingFailedError:
-                        log.error("Training failed, restarting with a different dataset.")
-                        continue
-                    else:
-                        log.info("Training")
-                        break
-                    finally:
-                        delete_cache("./data/training")
-                        delete_cache("./data/evaluation")
+                                slog.info("Evaluating sentiment analyzer: %s", sa)
+                                evaluation_results = sa.evaluate(evaluation_dataset_func=datasets.evaluation)
+                                slog.info("Evaluation results: %s", evaluation_results)
+                                break
 
 
 if __name__ == "__main__":
-    install_log_handler()
-    config.proxies.resolve()
     main()
diff --git a/unimore_bda_6/analysis/base.py b/unimore_bda_6/analysis/base.py
index b9eb589..3cee461 100644
--- a/unimore_bda_6/analysis/base.py
+++ b/unimore_bda_6/analysis/base.py
@@ -1,38 +1,42 @@
+from __future__ import annotations
+
 import abc
 import logging
 import dataclasses
 
-from ..database import Text, Category, DatasetFunc
+from ..database import Text, Category, CachedDatasetFunc
+from ..tokenizer import BaseTokenizer
 
 log = logging.getLogger(__name__)
 
 
-@dataclasses.dataclass
-class EvaluationResults:
-    correct: int
-    evaluated: int
-    score: float
-
-    def __repr__(self):
-        return f"<EvaluationResults: score of {self.score} out of {self.evaluated} evaluated tuples>"
-
-    def __str__(self):
-        return f"{self.evaluated} evaluated, {self.correct} correct, {self.correct / self.evaluated * 100:.2} % accuracy, {self.score:.2} score, {self.score / self.evaluated * 100:.2} scoreaccuracy"
-
-
 class BaseSentimentAnalyzer(metaclass=abc.ABCMeta):
     """
     Abstract base class for sentiment analyzers implemented in this project.
     """
 
+    # noinspection PyUnusedLocal
+    def __init__(self, *, tokenizer: BaseTokenizer):
+        pass
+
+    def __repr__(self):
+        return f"<{self.__class__.__qualname__}>"
+
     @abc.abstractmethod
-    def train(self, dataset_func: DatasetFunc) -> None:
+    def train(self, training_dataset_func: CachedDatasetFunc, validation_dataset_func: CachedDatasetFunc) -> None:
         """
-        Train the analyzer with the given training dataset.
+        Train the analyzer with the given training and validation datasets.
         """
         raise NotImplementedError()
 
-    def evaluate(self, dataset_func: DatasetFunc) -> EvaluationResults:
+    @abc.abstractmethod
+    def use(self, text: Text) -> Category:
+        """
+        Run the model on the given input.
+        """
+        raise NotImplementedError()
+
+    def evaluate(self, evaluation_dataset_func: CachedDatasetFunc) -> EvaluationResults:
         """
         Perform a model evaluation by calling repeatedly `.use` on every text of the test dataset and by comparing its resulting category with the expected category.
 
@@ -43,23 +47,30 @@ class BaseSentimentAnalyzer(metaclass=abc.ABCMeta):
         correct: int = 0
         score: float = 0.0
 
-        for review in dataset_func():
+        for review in evaluation_dataset_func():
             resulting_category = self.use(review.text)
             evaluated += 1
             correct += 1 if resulting_category == review.category else 0
             score += 1 - (abs(resulting_category - review.category) / 4)
-            if not evaluated % 100:
-                temp_results = EvaluationResults(correct=correct, evaluated=evaluated, score=score)
-                log.debug(f"{temp_results!s}")
 
         return EvaluationResults(correct=correct, evaluated=evaluated, score=score)
 
-    @abc.abstractmethod
-    def use(self, text: Text) -> Category:
-        """
-        Run the model on the given input.
-        """
-        raise NotImplementedError()
+
+@dataclasses.dataclass
+class EvaluationResults:
+    """
+    Container for the results of a dataset evaluation.
+    """
+
+    correct: int
+    evaluated: int
+    score: float
+
+    def __repr__(self):
+        return f"<EvaluationResults: {self!s}>"
+
+    def __str__(self):
+        return f"{self.evaluated} evaluated, {self.correct} correct, {self.correct / self.evaluated:.2%} accuracy, {self.score:.2f} score, {self.score / self.evaluated:.2%} scoreaccuracy"
 
 
 class AlreadyTrainedError(Exception):
diff --git a/unimore_bda_6/analysis/nltk_sentiment.py b/unimore_bda_6/analysis/nltk_sentiment.py
index 1feaa95..f3d4b86 100644
--- a/unimore_bda_6/analysis/nltk_sentiment.py
+++ b/unimore_bda_6/analysis/nltk_sentiment.py
@@ -6,7 +6,7 @@ import logging
 import typing as t
 import itertools
 
-from ..database import Text, Category, Review, DatasetFunc
+from ..database import Text, Category, Review, CachedDatasetFunc
 from .base import BaseSentimentAnalyzer, AlreadyTrainedError, NotTrainedError
 from ..log import count_passage
 from ..tokenizer import BaseTokenizer
@@ -23,7 +23,11 @@ class NLTKSentimentAnalyzer(BaseSentimentAnalyzer):
     """
 
     def __init__(self, *, tokenizer: BaseTokenizer) -> None:
-        super().__init__()
+        if not tokenizer.supports_plain():
+            raise TypeError("Tokenizer does not support NLTK")
+
+        super().__init__(tokenizer=tokenizer)
+
         self.model: nltk.sentiment.SentimentAnalyzer = nltk.sentiment.SentimentAnalyzer()
         self.trained: bool = False
         self.tokenizer: BaseTokenizer = tokenizer
@@ -36,7 +40,7 @@ class NLTKSentimentAnalyzer(BaseSentimentAnalyzer):
         Convert the `Text` of a `DataTuple` to a `TokenBag`.
         """
         count_passage(log, "tokenize_datatuple", 100)
-        return self.tokenizer.tokenize_builtins(datatuple.text), datatuple.category
+        return self.tokenizer.tokenize_plain(datatuple.text), datatuple.category
 
     def _add_feature_unigrams(self, dataset: t.Iterator[tuple[TokenBag, Category]]) -> None:
         """
@@ -67,13 +71,13 @@ class NLTKSentimentAnalyzer(BaseSentimentAnalyzer):
         count_passage(log, "extract_features", 100)
         return self.model.extract_features(data[0]), data[1]
 
-    def train(self, dataset_func: DatasetFunc) -> None:
+    def train(self, training_dataset_func: CachedDatasetFunc, validation_dataset_func: CachedDatasetFunc) -> None:
         # Forbid retraining the model
         if self.trained:
             raise AlreadyTrainedError()
 
         # Get a generator
-        dataset: t.Generator[Review] = dataset_func()
+        dataset: t.Generator[Review] = training_dataset_func()
 
         # Tokenize the dataset
         dataset: t.Iterator[tuple[TokenBag, Category]] = map(self.__tokenize_review, dataset)
@@ -103,7 +107,7 @@ class NLTKSentimentAnalyzer(BaseSentimentAnalyzer):
             raise NotTrainedError()
 
         # Tokenize the input
-        tokens = self.tokenizer.tokenize_builtins(text)
+        tokens = self.tokenizer.tokenize_plain(text)
 
         # Run the classification method
         return self.model.classify(instance=tokens)
diff --git a/unimore_bda_6/analysis/tf_text.py b/unimore_bda_6/analysis/tf_text.py
index ba27c1d..257c106 100644
--- a/unimore_bda_6/analysis/tf_text.py
+++ b/unimore_bda_6/analysis/tf_text.py
@@ -1,7 +1,7 @@
 import tensorflow
 import logging
 
-from ..database import Text, Category, DatasetFunc
+from ..database import Text, Category, CachedDatasetFunc
 from ..config import TENSORFLOW_EMBEDDING_SIZE, TENSORFLOW_MAX_FEATURES, TENSORFLOW_EPOCHS
 from ..tokenizer import BaseTokenizer
 from .base import BaseSentimentAnalyzer, AlreadyTrainedError, NotTrainedError, TrainingFailedError
@@ -9,9 +9,19 @@ from .base import BaseSentimentAnalyzer, AlreadyTrainedError, NotTrainedError, T
 log = logging.getLogger(__name__)
 
 
+if len(tensorflow.config.list_physical_devices(device_type="GPU")) == 0:
+    log.warning("Tensorflow reports no GPU acceleration available.")
+else:
+    log.debug("Tensorflow successfully found GPU acceleration!")
+
+
 class TensorflowSentimentAnalyzer(BaseSentimentAnalyzer):
-    def __init__(self, tokenizer: BaseTokenizer):
-        super().__init__()
+    def __init__(self, *, tokenizer: BaseTokenizer):
+        if not tokenizer.supports_tensorflow():
+            raise TypeError("Tokenizer does not support Tensorflow")
+
+        super().__init__(tokenizer=tokenizer)
+
         self.trained: bool = False
 
         self.text_vectorization_layer: tensorflow.keras.layers.TextVectorization = self._build_vectorizer(tokenizer)
@@ -19,7 +29,11 @@ class TensorflowSentimentAnalyzer(BaseSentimentAnalyzer):
         self.history: tensorflow.keras.callbacks.History | None = None
 
     @staticmethod
-    def _build_dataset(dataset_func: DatasetFunc) -> tensorflow.data.Dataset:
+    def _build_dataset(dataset_func: CachedDatasetFunc) -> tensorflow.data.Dataset:
+        """
+        Convert a `CachedDatasetFunc` to a `tensorflow.data.Dataset`.
+        """
+
         def dataset_func_with_tensor_tuple():
             for review in dataset_func():
                 yield review.to_tensor_tuple()
@@ -43,15 +57,16 @@ class TensorflowSentimentAnalyzer(BaseSentimentAnalyzer):
 
     @staticmethod
     def _build_model() -> tensorflow.keras.Sequential:
-        log.debug("Creating %s model...", tensorflow.keras.Sequential)
+        log.debug("Creating model...")
         model = tensorflow.keras.Sequential([
             tensorflow.keras.layers.Embedding(
                 input_dim=TENSORFLOW_MAX_FEATURES.__wrapped__ + 1,
                 output_dim=TENSORFLOW_EMBEDDING_SIZE.__wrapped__,
             ),
-            tensorflow.keras.layers.Dropout(0.2),
+            tensorflow.keras.layers.Dropout(0.25),
             tensorflow.keras.layers.GlobalAveragePooling1D(),
-            tensorflow.keras.layers.Dropout(0.2),
+            tensorflow.keras.layers.Dropout(0.25),
+            tensorflow.keras.layers.Dense(25),
             tensorflow.keras.layers.Dense(5, activation="softmax"),
         ])
         log.debug("Compiling model: %s", model)
@@ -72,31 +87,35 @@ class TensorflowSentimentAnalyzer(BaseSentimentAnalyzer):
             max_tokens=TENSORFLOW_MAX_FEATURES.__wrapped__
         )
 
-    def train(self, dataset_func: DatasetFunc) -> None:
+    def train(self, training_dataset_func: CachedDatasetFunc, validation_dataset_func: CachedDatasetFunc) -> None:
         if self.trained:
             log.error("Tried to train an already trained model.")
             raise AlreadyTrainedError()
 
-        log.debug("Building dataset...")
-        training_set = self._build_dataset(dataset_func)
+        log.debug("Building datasets...")
+        training_set = self._build_dataset(training_dataset_func)
+        validation_set = self._build_dataset(validation_dataset_func)
         log.debug("Built dataset: %s", training_set)
 
         log.debug("Preparing training_set for %s...", self.text_vectorization_layer.adapt)
         only_text_set = training_set.map(lambda text, category: text)
+
         log.debug("Adapting text_vectorization_layer: %s", self.text_vectorization_layer)
         self.text_vectorization_layer.adapt(only_text_set)
         log.debug("Adapted text_vectorization_layer: %s", self.text_vectorization_layer)
 
         log.debug("Preparing training_set for %s...", self.model.fit)
         training_set = training_set.map(lambda text, category: (self.text_vectorization_layer(text), category))
+        validation_set = validation_set.map(lambda text, category: (self.text_vectorization_layer(text), category))
         log.info("Training: %s", self.model)
         self.history: tensorflow.keras.callbacks.History | None  = self.model.fit(
             training_set,
+            validation_data=validation_set,
             epochs=TENSORFLOW_EPOCHS.__wrapped__,
             callbacks=[
                 tensorflow.keras.callbacks.TerminateOnNaN()
-            ])
-        log.info("Trained: %s", self.model)
+            ],
+        )
 
         if len(self.history.epoch) < TENSORFLOW_EPOCHS.__wrapped__:
             log.error("Model %s training failed: only %d epochs computed", self.model, len(self.history.epoch))
diff --git a/unimore_bda_6/config.py b/unimore_bda_6/config.py
index 8dcc079..c07d29f 100644
--- a/unimore_bda_6/config.py
+++ b/unimore_bda_6/config.py
@@ -45,14 +45,44 @@ def WORKING_SET_SIZE(val: str | None) -> int:
 
 
 @config.optional()
-def DATA_SET_SIZE(val: str | None) -> int:
+def TRAINING_SET_SIZE(val: str | None) -> int:
     """
-    The number of reviews from each category to fetch for the datasets.
+    The number of reviews from each category to fetch for the training dataset.
 
-    Defaults to `1750`.
+    Defaults to `5000`.
     """
     if val is None:
-        return 1750
+        return 5000
+    try:
+        return int(val)
+    except ValueError:
+        raise cfig.InvalidValueError("Not an int.")
+
+
+@config.optional()
+def VALIDATION_SET_SIZE(val: str | None) -> int:
+    """
+    The number of reviews from each category to fetch for the training dataset.
+
+    Defaults to `400`.
+    """
+    if val is None:
+        return 400
+    try:
+        return int(val)
+    except ValueError:
+        raise cfig.InvalidValueError("Not an int.")
+
+
+@config.optional()
+def EVALUATION_SET_SIZE(val: str | None) -> int:
+    """
+    The number of reviews from each category to fetch for the evaluation dataset.
+
+    Defaults to `1000`.
+    """
+    if val is None:
+        return 1000
     try:
         return int(val)
     except ValueError:
@@ -79,10 +109,10 @@ def TENSORFLOW_EMBEDDING_SIZE(val: str | None) -> int:
     """
     The size of the embeddings tensor to use in Tensorflow models.
 
-    Defaults to `12`.
+    Defaults to `6`.
     """
     if val is None:
-        return 12
+        return 6
     try:
         return int(val)
     except ValueError:
@@ -94,10 +124,10 @@ def TENSORFLOW_EPOCHS(val: str | None) -> int:
     """
     The number of epochs to train Tensorflow models for.
 
-    Defaults to `15`.
+    Defaults to `12`.
     """
     if val is None:
-        return 15
+        return 12
     try:
         return int(val)
     except ValueError:
@@ -109,7 +139,9 @@ __all__ = (
     "MONGO_HOST",
     "MONGO_PORT",
     "WORKING_SET_SIZE",
-    "DATA_SET_SIZE",
+    "TRAINING_SET_SIZE",
+    "VALIDATION_SET_SIZE",
+    "EVALUATION_SET_SIZE",
     "TENSORFLOW_MAX_FEATURES",
     "TENSORFLOW_EMBEDDING_SIZE",
     "TENSORFLOW_EPOCHS",
diff --git a/unimore_bda_6/database/cache.py b/unimore_bda_6/database/cache.py
index 29f530f..e6a3d45 100644
--- a/unimore_bda_6/database/cache.py
+++ b/unimore_bda_6/database/cache.py
@@ -9,7 +9,7 @@ from .datatypes import Review
 log = logging.getLogger(__name__)
 
 
-DatasetFunc = t.Callable[[], t.Generator[Review, t.Any, None]]
+CachedDatasetFunc = t.Callable[[], t.Generator[Review, t.Any, None]]
 
 
 def store_cache(reviews: t.Iterator[Review], path: str | pathlib.Path) -> None:
@@ -34,7 +34,7 @@ def store_cache(reviews: t.Iterator[Review], path: str | pathlib.Path) -> None:
             pickle.dump(document, file)
 
 
-def load_cache(path: str | pathlib.Path) -> DatasetFunc:
+def load_cache(path: str | pathlib.Path) -> CachedDatasetFunc:
     """
     Load the contents of a directory into a `Review` iterator.
     """
@@ -69,12 +69,12 @@ def delete_cache(path: str | pathlib.Path) -> None:
     if not path.exists():
         raise FileNotFoundError("The specified path does not exist.")
 
-    log.warning("Deleting cache directory: %s", path)
+    log.debug("Deleting cache directory: %s", path)
     shutil.rmtree(path)
 
 
 __all__ = (
-    "DatasetFunc",
+    "CachedDatasetFunc",
     "store_cache",
     "load_cache",
     "delete_cache",
diff --git a/unimore_bda_6/database/connection.py b/unimore_bda_6/database/connection.py
index 2f8e7e3..5e3d703 100644
--- a/unimore_bda_6/database/connection.py
+++ b/unimore_bda_6/database/connection.py
@@ -1,4 +1,5 @@
 import pymongo
+import pymongo.errors
 import contextlib
 import typing as t
 import logging
@@ -13,12 +14,12 @@ def mongo_client_from_config() -> t.ContextManager[pymongo.MongoClient]:
     """
     Create a new MongoDB client and yield it.
     """
-    log.debug("Opening connection to MongoDB...")
+    log.debug("Creating MongoDB client...")
     client: pymongo.MongoClient = pymongo.MongoClient(
         host=MONGO_HOST.__wrapped__,
         port=MONGO_PORT.__wrapped__,
     )
-    log.info("Opened connection to MongoDB!")
+    log.debug("Created MongoDB client!")
 
     yield client
 
diff --git a/unimore_bda_6/database/datatypes.py b/unimore_bda_6/database/datatypes.py
index 1af2b7d..980b7e6 100644
--- a/unimore_bda_6/database/datatypes.py
+++ b/unimore_bda_6/database/datatypes.py
@@ -10,6 +10,11 @@ Category = float
 
 
 class Review:
+    __slots__ = (
+        "text",
+        "category",
+    )
+
     def __init__(self, text: Text, category: Category):
         self.text: str = text
         self.category: float = category
diff --git a/unimore_bda_6/database/queries.py b/unimore_bda_6/database/queries.py
index c2cefc4..1d0801c 100644
--- a/unimore_bda_6/database/queries.py
+++ b/unimore_bda_6/database/queries.py
@@ -9,6 +9,9 @@ from .datatypes import Review
 log = logging.getLogger(__name__)
 
 
+SampleFunc = t.Callable[[pymongo.collection.Collection, int], t.Iterator[Review]]
+
+
 def sample_reviews(collection: pymongo.collection.Collection, amount: int) -> t.Iterator[Review]:
     """
     Get ``amount`` random reviews from the ``reviews`` collection.
@@ -41,18 +44,20 @@ def sample_reviews_by_rating(collection: pymongo.collection.Collection, rating:
 
 
 def sample_reviews_polar(collection: pymongo.collection.Collection, amount: int) -> t.Iterator[Review]:
-    log.debug("Getting a sample of %d polar reviews...", amount * 2)
+    category_amount = amount // 2
+
+    log.debug("Getting a sample of %d polar reviews...", category_amount * 2)
 
     cursor = collection.aggregate([
         {"$limit": WORKING_SET_SIZE.__wrapped__},
         {"$match": {"overall": 1.0}},
-        {"$sample": {"size": amount}},
+        {"$sample": {"size": category_amount}},
         {"$unionWith": {
             "coll": collection.name,
             "pipeline": [
                 {"$limit": WORKING_SET_SIZE.__wrapped__},
                 {"$match": {"overall": 5.0}},
-                {"$sample": {"size": amount}},
+                {"$sample": {"size": category_amount}},
             ],
         }},
         {"$addFields": {
@@ -69,37 +74,39 @@ def sample_reviews_polar(collection: pymongo.collection.Collection, amount: int)
 
 
 def sample_reviews_varied(collection: pymongo.collection.Collection, amount: int) -> t.Iterator[Review]:
-    log.debug("Getting a sample of %d varied reviews...", amount * 5)
+    category_amount = amount // 5
+
+    log.debug("Getting a sample of %d varied reviews...", category_amount * 5)
 
     # Wow, this is ugly.
     cursor = collection.aggregate([
         {"$limit": WORKING_SET_SIZE.__wrapped__},
         {"$match": {"overall": 1.0}},
-        {"$sample": {"size": amount}},
+        {"$sample": {"size": category_amount}},
         {"$unionWith": {
             "coll": collection.name,
             "pipeline": [
                 {"$limit": WORKING_SET_SIZE.__wrapped__},
                 {"$match": {"overall": 2.0}},
-                {"$sample": {"size": amount}},
+                {"$sample": {"size": category_amount}},
                 {"$unionWith": {
                     "coll": collection.name,
                     "pipeline": [
                         {"$limit": WORKING_SET_SIZE.__wrapped__},
                         {"$match": {"overall": 3.0}},
-                        {"$sample": {"size": amount}},
+                        {"$sample": {"size": category_amount}},
                         {"$unionWith": {
                             "coll": collection.name,
                             "pipeline": [
                                 {"$limit": WORKING_SET_SIZE.__wrapped__},
                                 {"$match": {"overall": 4.0}},
-                                {"$sample": {"size": amount}},
+                                {"$sample": {"size": category_amount}},
                                 {"$unionWith": {
                                     "coll": collection.name,
                                     "pipeline": [
                                         {"$limit": WORKING_SET_SIZE.__wrapped__},
                                         {"$match": {"overall": 5.0}},
-                                        {"$sample": {"size": amount}},
+                                        {"$sample": {"size": category_amount}},
                                     ],
                                 }}
                             ],
@@ -122,6 +129,7 @@ def sample_reviews_varied(collection: pymongo.collection.Collection, amount: int
 
 
 __all__ = (
+    "SampleFunc",
     "sample_reviews",
     "sample_reviews_by_rating",
     "sample_reviews_polar",
diff --git a/unimore_bda_6/log.py b/unimore_bda_6/log.py
index f6f0fcd..2a55216 100644
--- a/unimore_bda_6/log.py
+++ b/unimore_bda_6/log.py
@@ -15,15 +15,15 @@ def install_log_handler(loggers: list[logging.Logger] = None):
     for logger in loggers:
         coloredlogs.install(
             logger=logger,
-            level="DEBUG",
-            fmt="{asctime} | {name:<32} | {levelname:>8} | {message}",
+            level="DEBUG" if __debug__ else "INFO",
+            fmt="{asctime} | {name:<80} | {levelname:>8} | {message}",
             style="{",
             level_styles=dict(
                 debug=dict(color="white"),
                 info=dict(color="cyan"),
                 warning=dict(color="yellow"),
                 error=dict(color="red"),
-                critical=dict(color="red", bold=True),
+                critical=dict(color="black", background="red", bold=True),
             ),
             field_styles=dict(
                 asctime=dict(color='magenta'),
diff --git a/unimore_bda_6/tokenizer/__init__.py b/unimore_bda_6/tokenizer/__init__.py
index 91253b6..777174f 100644
--- a/unimore_bda_6/tokenizer/__init__.py
+++ b/unimore_bda_6/tokenizer/__init__.py
@@ -1,6 +1,7 @@
 from .base import BaseTokenizer
 from .nltk_word_tokenize import NLTKWordTokenizer
 from .potts import PottsTokenizer, PottsTokenizerWithNegation
+from .plain import PlainTokenizer
 from .lower import LowercaseTokenizer
 
 
@@ -9,5 +10,6 @@ __all__ = (
     "NLTKWordTokenizer",
     "PottsTokenizer",
     "PottsTokenizerWithNegation",
+    "PlainTokenizer",
     "LowercaseTokenizer",
 )
diff --git a/unimore_bda_6/tokenizer/base.py b/unimore_bda_6/tokenizer/base.py
index 378b324..f4b28e8 100644
--- a/unimore_bda_6/tokenizer/base.py
+++ b/unimore_bda_6/tokenizer/base.py
@@ -14,21 +14,21 @@ class BaseTokenizer:
         f.__notimplemented__ = True
         return f
 
-    def can_tokenize_builtins(self) -> bool:
-        return getattr(self.tokenize_builtins, "__notimplemented__", False)
+    def supports_plain(self) -> bool:
+        return not getattr(self.tokenize_plain, "__notimplemented__", False)
 
-    def can_tokenize_tensorflow(self) -> bool:
-        return getattr(self.tokenize_tensorflow, "__notimplemented__", False)
+    def supports_tensorflow(self) -> bool:
+        return not getattr(self.tokenize_tensorflow, "__notimplemented__", False)
 
     @__not_implemented
-    def tokenize_builtins(self, text: str) -> list[str]:
+    def tokenize_plain(self, text: str) -> list[str]:
         """
         Convert a text string into a list of tokens.
         """
         raise NotImplementedError()
 
     @__not_implemented
-    def tokenize_tensorflow(self, text: tensorflow.Tensor) -> tensorflow.Tensor:
+    def tokenize_tensorflow(self, text: "tensorflow.Tensor") -> "tensorflow.Tensor":
         """
         Convert a `tensorflow.Tensor` string into another `tensorflow.Tensor` space-separated string.
         """
diff --git a/unimore_bda_6/tokenizer/lower.py b/unimore_bda_6/tokenizer/lower.py
index 99d9d6e..77177e0 100644
--- a/unimore_bda_6/tokenizer/lower.py
+++ b/unimore_bda_6/tokenizer/lower.py
@@ -4,7 +4,11 @@ from .base import BaseTokenizer
 
 
 class LowercaseTokenizer(BaseTokenizer):
-    def tokenize_builtins(self, text: str) -> list[str]:
+    """
+    Tokenizer which converts the words to lowercase before splitting them via spaces.
+    """
+
+    def tokenize_plain(self, text: str) -> list[str]:
         return text.lower().split()
 
     def tokenize_tensorflow(self, text: tensorflow.Tensor) -> tensorflow.Tensor:
diff --git a/unimore_bda_6/tokenizer/nltk_word_tokenize.py b/unimore_bda_6/tokenizer/nltk_word_tokenize.py
index 593cb47..e56776c 100644
--- a/unimore_bda_6/tokenizer/nltk_word_tokenize.py
+++ b/unimore_bda_6/tokenizer/nltk_word_tokenize.py
@@ -10,7 +10,7 @@ class NLTKWordTokenizer(BaseTokenizer):
     Tokenizer based on `nltk.word_tokenize`.
     """
 
-    def tokenize_builtins(self, text: str) -> t.Iterable[str]:
+    def tokenize_plain(self, text: str) -> t.Iterable[str]:
         tokens = nltk.word_tokenize(text)
         nltk.sentiment.util.mark_negation(tokens, shallow=True)
         return tokens
diff --git a/unimore_bda_6/tokenizer/plain.py b/unimore_bda_6/tokenizer/plain.py
new file mode 100644
index 0000000..206131d
--- /dev/null
+++ b/unimore_bda_6/tokenizer/plain.py
@@ -0,0 +1,16 @@
+import tensorflow
+
+from .base import BaseTokenizer
+
+
+class PlainTokenizer(BaseTokenizer):
+    """
+    Tokenizer which just splits the text into tokens by separating them at whitespaces.
+    """
+
+    def tokenize_plain(self, text: str) -> list[str]:
+        return text.split()
+
+    def tokenize_tensorflow(self, text: tensorflow.Tensor) -> tensorflow.Tensor:
+        text = tensorflow.expand_dims(text, -1, name="tokens")
+        return text
diff --git a/unimore_bda_6/tokenizer/potts.py b/unimore_bda_6/tokenizer/potts.py
index cb4f52c..bc44fb3 100644
--- a/unimore_bda_6/tokenizer/potts.py
+++ b/unimore_bda_6/tokenizer/potts.py
@@ -104,7 +104,7 @@ regex_strings = (
     emoticon_string
     ,
     # HTML tags:
-     r"""<[^>]+>"""
+    r"""<[^>]+>"""
     ,
     # Twitter username:
     r"""(?:@[\w_]+)"""
@@ -124,7 +124,7 @@ regex_strings = (
     |
     (?:\S)                         # Everything else that isn't whitespace.
     """
-    )
+)
 
 ######################################################################
 # This is the core tokenizing regex:
@@ -139,6 +139,7 @@ html_entity_digit_re = re.compile(r"&#\d+;")
 html_entity_alpha_re = re.compile(r"&\w+;")
 amp = "&amp;"
 
+
 ######################################################################
 
 
@@ -165,7 +166,7 @@ class PottsTokenizer(BaseTokenizer):
                     pass
         # Now the alpha versions:
         ents = set(html_entity_alpha_re.findall(s))
-        ents = filter((lambda x : x != amp), ents)
+        ents = filter((lambda x: x != amp), ents)
         for ent in ents:
             entname = ent[1:-1]
             try:
@@ -175,7 +176,7 @@ class PottsTokenizer(BaseTokenizer):
             s = s.replace(amp, " and ")
         return s
 
-    def tokenize_builtins(self, text: str) -> t.Iterable[str]:
+    def tokenize_plain(self, text: str) -> t.Iterable[str]:
         # Fix HTML character entitites:
         s = self.__html2string(text)
         # Tokenize:
@@ -187,8 +188,8 @@ class PottsTokenizer(BaseTokenizer):
 
 
 class PottsTokenizerWithNegation(PottsTokenizer):
-    def tokenize_builtins(self, text: str) -> t.Iterable[str]:
-        words = super().tokenize_builtins(text)
+    def tokenize_plain(self, text: str) -> t.Iterable[str]:
+        words = super().tokenize_plain(text)
         nltk.sentiment.util.mark_negation(words, shallow=True)
         return words