diff --git a/.github/workflows/export_constants.py b/.github/workflows/export_constants.py
new file mode 100644
index 00000000..6421498a
--- /dev/null
+++ b/.github/workflows/export_constants.py
@@ -0,0 +1,22 @@
+import json
+
+from chebai.preprocessing.reader import (
+    CLS_TOKEN,
+    EMBEDDING_OFFSET,
+    MASK_TOKEN_INDEX,
+    PADDING_TOKEN_INDEX,
+)
+
+# Define the constants you want to export
+# Any changes in the key names here should also follow the same change in verify_constants.yml code
+constants = {
+    "EMBEDDING_OFFSET": EMBEDDING_OFFSET,
+    "CLS_TOKEN": CLS_TOKEN,
+    "PADDING_TOKEN_INDEX": PADDING_TOKEN_INDEX,
+    "MASK_TOKEN_INDEX": MASK_TOKEN_INDEX,
+}
+
+if __name__ == "__main__":
+    # Write constants to a JSON file
+    with open("constants.json", "w") as f:
+        json.dump(constants, f)
diff --git a/.github/workflows/token_consistency.yaml b/.github/workflows/token_consistency.yaml
new file mode 100644
index 00000000..06c3a42e
--- /dev/null
+++ b/.github/workflows/token_consistency.yaml
@@ -0,0 +1,128 @@
+name: Check consistency of tokens.txt file
+
+# Define the file paths under `paths` to trigger this check only when specific files are modified.
+# This script will then execute checks only on files that have changed, rather than all files listed in `paths`.
+
+# **Note** : To add a new token file for checks, include its path in:
+# - `on` -> `push` and `pull_request` sections
+# - `jobs` -> `check_tokens` -> `steps` -> Set global variable for multiple tokens.txt paths -> `TOKENS_FILES`
+
+on:
+  push:
+    paths:
+      - "chebai/preprocessing/bin/smiles_token/tokens.txt"
+      - "chebai/preprocessing/bin/smiles_token_unlabeled/tokens.txt"
+      - "chebai/preprocessing/bin/selfies/tokens.txt"
+      - "chebai/preprocessing/bin/protein_token/tokens.txt"
+      - "chebai/preprocessing/bin/graph_properties/tokens.txt"
+      - "chebai/preprocessing/bin/graph/tokens.txt"
+      - "chebai/preprocessing/bin/deepsmiles_token/tokens.txt"
+      - "chebai/preprocessing/bin/protein_token_3_gram/tokens.txt"
+  pull_request:
+    paths:
+      - "chebai/preprocessing/bin/smiles_token/tokens.txt"
+      - "chebai/preprocessing/bin/smiles_token_unlabeled/tokens.txt"
+      - "chebai/preprocessing/bin/selfies/tokens.txt"
+      - "chebai/preprocessing/bin/protein_token/tokens.txt"
+      - "chebai/preprocessing/bin/graph_properties/tokens.txt"
+      - "chebai/preprocessing/bin/graph/tokens.txt"
+      - "chebai/preprocessing/bin/deepsmiles_token/tokens.txt"
+      - "chebai/preprocessing/bin/protein_token_3_gram/tokens.txt"
+
+jobs:
+  check_tokens:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Get list of changed files
+        id: changed_files
+        run: |
+          git fetch origin dev
+
+          # Get the list of changed files compared to origin/dev and save them to a file
+          git diff --name-only origin/dev > changed_files.txt
+
+          # Print the names of changed files on separate lines
+          echo "Changed files:"
+          while read -r line; do
+            echo "Changed File name : $line"
+          done < changed_files.txt
+
+      - name: Set global variable for multiple tokens.txt paths
+        run: |
+          # All token files that needs to checked must be included here too, same as in `paths`.
+          TOKENS_FILES=(
+            "chebai/preprocessing/bin/smiles_token/tokens.txt"
+            "chebai/preprocessing/bin/smiles_token_unlabeled/tokens.txt"
+            "chebai/preprocessing/bin/selfies/tokens.txt"
+            "chebai/preprocessing/bin/protein_token/tokens.txt"
+            "chebai/preprocessing/bin/graph_properties/tokens.txt"
+            "chebai/preprocessing/bin/graph/tokens.txt"
+            "chebai/preprocessing/bin/deepsmiles_token/tokens.txt"
+            "chebai/preprocessing/bin/protein_token_3_gram/tokens.txt"
+          )
+          echo "TOKENS_FILES=${TOKENS_FILES[*]}" >> $GITHUB_ENV
+
+      - name: Process only changed tokens.txt files
+        run: |
+          # Convert the TOKENS_FILES environment variable into an array
+          TOKENS_FILES=(${TOKENS_FILES})
+
+          # Iterate over each token file path
+          for TOKENS_FILE_PATH in "${TOKENS_FILES[@]}"; do
+            # Check if the current token file path is in the list of changed files
+            if grep -q "$TOKENS_FILE_PATH" changed_files.txt; then
+              echo "----------------------- Processing $TOKENS_FILE_PATH -----------------------"
+
+              # Get previous tokens.txt version
+              git fetch origin dev
+              git diff origin/dev -- $TOKENS_FILE_PATH > tokens_diff.txt || echo "No previous tokens.txt found for $TOKENS_FILE_PATH"
+
+              # Check for deleted or added lines in tokens.txt
+              if [ -f tokens_diff.txt ]; then
+
+                # Check for deleted lines (lines starting with '-')
+                deleted_lines=$(grep '^-' tokens_diff.txt | grep -v '^---' | sed 's/^-//' || true)
+                if [ -n "$deleted_lines" ]; then
+                  echo "Error: Lines have been deleted from $TOKENS_FILE_PATH."
+                  echo -e "Deleted Lines: \n$deleted_lines"
+                  exit 1
+                fi
+
+                # Check for added lines (lines starting with '+')
+                added_lines=$(grep '^+' tokens_diff.txt | grep -v '^+++' | sed 's/^+//' || true)
+                if [ -n "$added_lines" ]; then
+
+                  # Count how many lines have been added
+                  num_added_lines=$(echo "$added_lines" | wc -l)
+
+                  # Get last `n` lines (equal to num_added_lines) of tokens.txt
+                  last_lines=$(tail -n "$num_added_lines" $TOKENS_FILE_PATH)
+
+                  # Check if the added lines are at the end of the file
+                  if [ "$added_lines" != "$last_lines" ]; then
+
+                    # Find lines that were added but not appended at the end of the file
+                    non_appended_lines=$(diff <(echo "$added_lines") <(echo "$last_lines") | grep '^<' | sed 's/^< //')
+
+                    echo "Error: New lines have been added to $TOKENS_FILE_PATH, but they are not at the end of the file."
+                    echo -e "Added lines that are not at the end of the file: \n$non_appended_lines"
+                    exit 1
+                  fi
+                fi
+
+                if [ "$added_lines" == "" ]; then
+                    echo "$TOKENS_FILE_PATH validation successful: No lines were deleted, and no new lines were added."
+                else
+                    echo "$TOKENS_FILE_PATH validation successful: No lines were deleted, and new lines were correctly appended at the end."
+                fi
+              else
+                echo "No previous version of $TOKENS_FILE_PATH found."
+              fi
+            else
+              echo "$TOKENS_FILE_PATH was not changed, skipping."
+            fi
+          done
diff --git a/.github/workflows/verify_constants.yml b/.github/workflows/verify_constants.yml
new file mode 100644
index 00000000..3246f64d
--- /dev/null
+++ b/.github/workflows/verify_constants.yml
@@ -0,0 +1,116 @@
+name: Verify Constants
+
+# Define the file paths under `paths` to trigger this check only when specific files are modified.
+# This script will then execute checks only on files that have changed, rather than all files listed in `paths`.
+
+# **Note** : To add a new file for checks, include its path in:
+# - `on` -> `push` and `pull_request` sections
+# - `jobs` -> `verify-constants` -> `steps` -> Verify constants -> Add a new if else for your file, with check logic inside it.
+
+
+on:
+  push:
+    paths:
+      - "chebai/preprocessing/reader.py"
+  pull_request:
+    paths:
+      - "chebai/preprocessing/reader.py"
+
+jobs:
+  verify-constants:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [
+#       Only use 3.10 as of now
+#          "3.9",
+          "3.10",
+#          "3.11"
+        ]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set PYTHONPATH
+        run: echo "PYTHONPATH=$PWD" >> $GITHUB_ENV
+
+      - name: Get list of changed files
+        id: changed_files
+        run: |
+          git fetch origin dev
+
+          # Get the list of changed files compared to origin/dev and save them to a file
+          git diff --name-only origin/dev > changed_files.txt
+
+          # Print the names of changed files on separate lines
+          echo "Changed files:"
+          while read -r line; do
+            echo "Changed File name : $line"
+          done < changed_files.txt
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        # Setting a fix version for torch due to an error with latest version (2.5.1)
+        # ImportError: cannot import name 'T_co' from 'torch.utils.data.dataset'
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install torch==2.4.1 --index-url https://download.pytorch.org/whl/cpu
+          python -m pip install -e .
+
+      - name: Export constants
+        run: python .github/workflows/export_constants.py
+
+      - name: Load constants into environment variables
+        id: load_constants
+        # "E_" is appended as suffix to every constant, to protect overwriting other sys env variables with same name
+        run: |
+          constants=$(cat constants.json)
+          echo "$constants" | jq -r 'to_entries|map("E_\(.key)=\(.value|tostring)")|.[]' >> $GITHUB_ENV
+
+      - name: Print all environment variables
+        run: printenv
+
+      - name: Verify constants
+        run: |
+          file_name="chebai/preprocessing/reader.py"
+          if grep -q "$file_name" changed_files.txt; then
+            echo "----------------------- Checking file : $file_name ----------------------- "
+
+            # Define expected values for constants
+            exp_embedding_offset="10"
+            exp_cls_token="2"
+            exp_padding_token_index="0"
+            exp_mask_token_index="1"
+
+            # Debugging output to check environment variables
+            echo "Current Environment Variables:"
+            echo "E_EMBEDDING_OFFSET = $E_EMBEDDING_OFFSET"
+            echo "Expected: $exp_embedding_offset"
+
+            # Verify constants match expected values
+            if [ "$E_EMBEDDING_OFFSET" != "$exp_embedding_offset" ]; then
+              echo "EMBEDDING_OFFSET ($E_EMBEDDING_OFFSET) does not match expected value ($exp_embedding_offset)!"
+              exit 1
+            fi
+            if [ "$E_CLS_TOKEN" != "$exp_cls_token" ]; then
+              echo "CLS_TOKEN ($E_CLS_TOKEN) does not match expected value ($exp_cls_token)!"
+              exit 1
+            fi
+            if [ "$E_PADDING_TOKEN_INDEX" != "$exp_padding_token_index" ]; then
+              echo "PADDING_TOKEN_INDEX ($E_PADDING_TOKEN_INDEX) does not match expected value ($exp_padding_token_index)!"
+              exit 1
+            fi
+            if [ "$E_MASK_TOKEN_INDEX" != "$exp_mask_token_index" ]; then
+              echo "MASK_TOKEN_INDEX ($E_MASK_TOKEN_INDEX) does not match expected value ($exp_mask_token_index)!"
+              exit 1
+            fi
+          else
+            echo "$file_name not found in changed_files.txt; skipping check."
+          fi
diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 00000000..88469734
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,2 @@
+[settings]
+known_third_party = Bio,deepsmiles,fastobo,iterstrat,jsonargparse,lightning,lightning_utilities,lnn,matplotlib,model,molecule,networkx,numpy,owlready2,pandas,pyhornedowl,pysmiles,pytorch_lightning,rdkit,requests,scipy,seaborn,selfies,setuptools,sklearn,torch,torch_geometric,torchmetrics,tqdm,transformers,utils,wandb
diff --git a/chebai/preprocessing/reader.py b/chebai/preprocessing/reader.py
index e220e1e4..e1f17fb9 100644
--- a/chebai/preprocessing/reader.py
+++ b/chebai/preprocessing/reader.py
@@ -8,7 +8,7 @@
 
 from chebai.preprocessing.collate import DefaultCollator, RaggedCollator
 
-EMBEDDING_OFFSET = 10
+EMBEDDING_OFFSET = 102
 PADDING_TOKEN_INDEX = 0
 MASK_TOKEN_INDEX = 1
 CLS_TOKEN = 2