diff --git a/mindfultensors/creator/__init__.py b/mindfultensors/creator/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/mindfultensors/creator/base_db_creator/__init__.py b/mindfultensors/creator/base_db_creator/__init__.py
new file mode 100644
index 0000000..79d2508
--- /dev/null
+++ b/mindfultensors/creator/base_db_creator/__init__.py
@@ -0,0 +1,6 @@
+from .base_db_creator import BaseDBCreator
+
+
+__all__ = [
+    "BaseDBCreator",
+]
diff --git a/mindfultensors/creator/base_db_creator/base_db_creator.py b/mindfultensors/creator/base_db_creator/base_db_creator.py
new file mode 100644
index 0000000..ab8f9b5
--- /dev/null
+++ b/mindfultensors/creator/base_db_creator/base_db_creator.py
@@ -0,0 +1,41 @@
+import abc
+
+
+class BaseDBCreator(abc.ABC):
+    """
+    Base class for database creators
+    """
+    def __init__(self):
+        """
+        Base class for database creators
+        """
+        super().__init__()
+
+    @abc.abstractmethod
+    def connect(self):
+        """
+        Connects to the database
+        """
+        pass
+
+    @abc.abstractmethod
+    def write(self, *args, **kwargs):
+        """
+        Writes the data
+        """
+        pass
+
+    @abc.abstractmethod
+    def close(self):
+        """
+        Closes the database connection
+        """
+        pass
+
+    @abc.abstractmethod
+    def clean(self):
+        """
+        Cleans the database
+        """
+        pass
+
diff --git a/mindfultensors/creator/mongo_creator/__init__.py b/mindfultensors/creator/mongo_creator/__init__.py
new file mode 100644
index 0000000..9bb7556
--- /dev/null
+++ b/mindfultensors/creator/mongo_creator/__init__.py
@@ -0,0 +1,6 @@
+from .mongo_creator import MongoDBCreator
+
+
+__all__ = [
+    "MongoDBCreator",
+]
diff --git a/mindfultensors/creator/mongo_creator/mongo_creator.py b/mindfultensors/creator/mongo_creator/mongo_creator.py
new file mode 100644
index 0000000..6cf16a6
--- /dev/null
+++ b/mindfultensors/creator/mongo_creator/mongo_creator.py
@@ -0,0 +1,163 @@
+import pandas as pd
+from typing import Dict, List, Callable, Optional, Any, Tuple
+
+from pymongo import MongoClient, ASCENDING
+
+
+from mindfultensors.utils import unit_interval_normalize as normalize
+from mindfultensors.creator.base_db_creator import BaseDBCreator
+from mindfultensors.creator.mongo_creator.utils import insert_samples
+
+
+class MongoDBCreator(BaseDBCreator):
+    """
+    MongoDB Creator class
+    """
+
+    def __init__(
+        self,
+        database_name: str,
+        collection_name: str,
+        host: str,
+        port: int,
+        preprocessing_functions: Optional[Dict[str, Callable]] = None,
+        chunk_size: int = 10,
+    ) -> BaseDBCreator:
+        """
+        Constructor
+
+        Args:
+        database_name: str: name of the database
+        collection_name: str: name of the collection
+        host: str: host name
+        port: int: port number
+        preprocessing_functions: Optional[Dict[str, Callable]]: dictionary of preprocessing functions
+        chunk_size: int: size of the chunk
+
+        Returns:
+        BaseDBCreator: an object of MongoDBCreator class
+        """
+        super().__init__()
+        self._database_name = database_name
+        self._collection_name = collection_name
+        self._host = host
+        self._port = port
+        self._url = f"mongodb://{self._host}:{self._port}"
+        self._preprocessing_functions = preprocessing_functions
+        self._chunk_size = chunk_size
+        self._client = None
+
+    def connect(self) -> None:
+        """
+        Connects to the database
+        """
+        self._client = MongoClient(self._url)
+        self._database = self._client[self._database_name]
+        self._collection_bin = self._database[f"{self._collection_name}.bin"]
+        self._collection_meta = self._database[f"{self._collection_name}.meta"]
+
+    def write(
+        self,
+        data: pd.DataFrame,
+        input_columns: List[str],
+        label_columns: List[str],
+        meta_columns: List[str],
+        label_description: Optional[Dict[str, str]] = None,
+        *args, **kwargs
+    ) -> None:
+        """
+        Writes the data
+
+        Args:
+        data: pd.DataFrame: data
+        input_columns: List[str]: list of input columns
+        label_columns: List[str]: list of label columns
+        meta_columns: List[str]: list of meta columns
+        label_description: Optional[Dict[str, str]: dictionary of label description
+
+        Returns:
+        None
+        """
+        insert_samples(
+            data,
+            input_columns,
+            label_columns,
+            meta_columns,
+            self._collection_bin,
+            self._collection_meta,
+            label_description=label_description,
+            chunk_size=self._chunk_size,
+            preprocessing_functions=self._preprocessing_functions
+        )
+        index_name_meta = self._collection_meta.create_index([("id", ASCENDING)])
+        index_name_bin = self._collection_bin.create_index([("id", ASCENDING)])
+
+    def clean(self) -> None:
+        """
+        Cleans the database
+
+        Args:
+        None
+
+        Returns:
+        None
+        """
+        self._collection_bin.drop()
+        self._collection_meta.drop()
+
+    def close(self) -> None:
+        """
+        Closes the database connection
+
+        Args:
+        None
+
+        Returns:
+        None
+        """
+        self._client.close()
+
+
+if __name__ == "__main__":
+
+    # Example usage
+    database_name = "mydatabase"
+    collection_name = "mycollection"
+    mongo_host = "10.245.12.58"
+    mongo_port = "27017"
+    metadata = pd.DataFrame(
+        columns=['t1', 't2', 'subject_id', 'age', 'gender']
+    )
+    metadata.loc[metadata.shape[0]] = [
+        './test_data/Template-T1-U8-RALPFH-BR.nii.gz',
+        './test_data/Template-T2-U8-RALPFH-BR.nii.gz',
+        1, 25, 'M'
+    ]
+    creator = MongoDBCreator(
+        database_name=database_name,
+        collection_name=collection_name,
+        host=mongo_host,
+        port=mongo_port,
+        preprocessing_functions={
+            't1': lambda x: normalize(x) * 255,
+            't2': lambda x: normalize(x) * 255,
+        },
+        chunk_size=10,
+    )
+    creator.connect()
+    creator.write(
+        data=metadata,
+        input_columns=['t1'],
+        label_columns=['t2'],
+        meta_columns=['subject_id', 'age', 'gender'],
+        label_description={"t2": "Lesion mask"}
+    )
+    sample_doc = creator._collection_bin.find_one({"kind": "t2"})
+    print (sample_doc.keys())
+    print (sample_doc['chunk_id'])
+    print (len(sample_doc['chunk']))
+    print (sample_doc['kind'])
+    print (int(creator._collection_bin.find_one(sort=[('id', -1)])['id'] + 1))
+    num_examples = int(creator._collection_bin.find_one(sort=[("id", -1)])["id"] + 1)
+    creator.clean()
+    creator.close()
diff --git a/mindfultensors/creator/mongo_creator/test_data/Template-T1-U8-RALPFH-BR.nii.gz b/mindfultensors/creator/mongo_creator/test_data/Template-T1-U8-RALPFH-BR.nii.gz
new file mode 100644
index 0000000..a9bf801
Binary files /dev/null and b/mindfultensors/creator/mongo_creator/test_data/Template-T1-U8-RALPFH-BR.nii.gz differ
diff --git a/mindfultensors/creator/mongo_creator/test_data/Template-T2-U8-RALPFH-BR.nii.gz b/mindfultensors/creator/mongo_creator/test_data/Template-T2-U8-RALPFH-BR.nii.gz
new file mode 100644
index 0000000..7895243
Binary files /dev/null and b/mindfultensors/creator/mongo_creator/test_data/Template-T2-U8-RALPFH-BR.nii.gz differ
diff --git a/mindfultensors/creator/mongo_creator/utils.py b/mindfultensors/creator/mongo_creator/utils.py
new file mode 100644
index 0000000..f267c6e
--- /dev/null
+++ b/mindfultensors/creator/mongo_creator/utils.py
@@ -0,0 +1,173 @@
+import bson
+import io
+import numpy as np
+import nibabel as nib
+import os
+import pandas as pd
+from tqdm import tqdm
+from typing import Dict, List, Callable, Optional, Any, Tuple
+
+from pymongo.collection import Collection
+
+import torch
+from torch import Tensor
+
+
+def tensor_2_bin(tensor: Tensor) -> bytes:
+    """
+    Convert tensor to binary
+
+    Args:
+    tensor: Tensor: tensor
+
+    Returns:
+    tensor_binary: binary
+    """
+    tensor_1d = tensor.to(torch.uint8)
+    # Serialize tensor and get binary
+    buffer = io.BytesIO()
+    torch.save(tensor_1d, buffer)
+    tensor_binary = buffer.getvalue()
+    return tensor_binary
+
+
+def chunk_binobj(
+    tensor_compressed: Tensor,
+    id: int,
+    kind: str,
+    chunksize: int
+) -> Dict[str, Any]:
+    """
+    Chunk the binary object
+
+    Args:
+    tensor_compressed: Tensor: compressed tensor
+    id: int: id
+    kind: str: kind
+    chunksize: int: chunk size
+
+    Returns:
+    Dict[str, Any]: dictionary of chunk
+    """
+    # Convert chunksize from megabytes to bytes
+    chunksize_bytes = chunksize * 1024 * 1024
+
+    # Calculate the number of chunks
+    num_chunks = len(tensor_compressed) // chunksize_bytes
+    if len(tensor_compressed) % chunksize_bytes != 0:
+        num_chunks += 1
+
+    # Yield chunks
+    for i in range(num_chunks):
+        start = i * chunksize_bytes
+        end = min((i + 1) * chunksize_bytes, len(tensor_compressed))
+        chunk = tensor_compressed[start:end]
+        yield {
+            "id": id,
+            "chunk_id": i,
+            "kind": kind,
+            "chunk": bson.Binary(chunk),
+        }
+
+
+def nifti_filename_2_tensor(filename: str) -> Tensor:
+    """
+    Convert NIFTI filename to tensor
+
+    Args:
+    filename: str: filename of NIFTI file
+
+    Returns:
+    Tensor: tensor
+    """
+    assert os.path.exists(filename)
+    assert filename.endswith(".nii") or filename.endswith(".nii.gz")
+    return torch.from_numpy(np.asanyarray(nib.load(filename).get_fdata()))
+
+
+def insert_data(
+    column: str,
+    filename: str,
+    index: int,
+    collection_bin: Collection,
+    chunk_size: int = 10,
+    preprocessing_functions: Optional[Dict[str, Callable]] = None,
+) -> Tuple[int]:
+    """
+    Insert data
+
+    Args:
+    column: str: column
+    filename: str: filename
+    index: int: index
+    collection_bin: Collection: collection bin
+    chunk_size: int: chunk size
+    preprocessing_functions: Optional[Dict[str, Callable]]: dictionary of preprocessing functions
+
+    Returns:
+    shape: Tuple[int]: shape
+    """
+    tensor_data = nifti_filename_2_tensor(filename)
+    shape = tensor_data.shape
+    if preprocessing_functions and column in preprocessing_functions:
+        tensor_data = preprocessing_functions[column](tensor_data)
+    tensor_data = tensor_2_bin(tensor_data)
+    # write data
+    for chunk in chunk_binobj(tensor_data, index, column, chunk_size):
+        collection_bin.insert_one(chunk)
+    return shape
+
+
+def insert_samples(
+    data: pd.DataFrame,
+    input_columns: List[str],
+    label_columns: List[str],
+    meta_columns: List[str],
+    collection_bin: Collection,
+    collection_meta: Collection,
+    label_description: Optional[Dict[str, str]] = None,
+    chunk_size: int = 10,
+    preprocessing_functions: Optional[Dict[str, Callable]] = None,
+) -> None:
+    """
+    Insert samples
+
+    Args:
+    data: pd.DataFrame: data
+    input_columns: List[str]: list of input columns
+    label_columns: List[str]: list of label columns
+    meta_columns: List[str]: list of meta columns
+    collection_bin: Collection: collection bin
+    collection_meta: Collection: collection meta
+    label_description: Optional[Dict[str, str]]: dictionary of label description
+    chunk_size: int: chunk size
+    preprocessing_functions: Optional[Dict[str, Callable]]: dictionary of preprocessing functions
+
+    Returns:
+    None
+    """
+    selected_columns = input_columns + label_columns + meta_columns
+    for index in tqdm(data.index):
+        meta_data = {"id": index, "labels": {}}
+        for column in selected_columns:
+            shape = None
+            value = data[column].iloc[index]
+            if column in meta_columns:
+                meta_data[column] = str(value)
+            else:
+                shape = insert_data(
+                    column, value, index,
+                    collection_bin, chunk_size, preprocessing_functions=preprocessing_functions
+                )
+                if "shape" not in meta_data:
+                    meta_data["shape"] = shape
+                else:
+                    assert meta_data["shape"] == shape
+                if column in label_columns:
+                    if column in label_description:
+                        meta_data["labels"][
+                            column] = label_description[column]
+                    else:
+                        meta_data["labels"][
+                            column] = "Label is not described"
+        collection_meta.insert_one(meta_data)
diff --git a/mindfultensors/gencoords.py b/mindfultensors/gencoords.py
index 91a6d5c..82775dd 100644
--- a/mindfultensors/gencoords.py
+++ b/mindfultensors/gencoords.py
@@ -32,16 +32,16 @@ def __init__(self, list_shape=None, list_sub_shape=None, mus=None, sigmas=None):
             mus = np.array(
                 [
                     self.volume_shape[0] // 2,
-                    self.volume_shape[0] // 2,
-                    self.volume_shape[0] // 2,
+                    self.volume_shape[1] // 2,
+                    self.volume_shape[2] // 2,
                 ]
             )
         if sigmas is None:
             sigmas = np.array(
                 [
                     self.volume_shape[0] // 4,
-                    self.volume_shape[0] // 4,
-                    self.volume_shape[0] // 4,
+                    self.volume_shape[1] // 4,
+                    self.volume_shape[2] // 4,
                 ]
             )
         self.truncnorm_coordinates = truncnorm(
diff --git a/mindfultensors/mongoloader.py b/mindfultensors/mongoloader.py
index fdbe0ee..784c6d6 100644
--- a/mindfultensors/mongoloader.py
+++ b/mindfultensors/mongoloader.py
@@ -102,7 +102,6 @@ def __getitem__(self, batch):
             # Separate processing for each 'kind'
             data = self.make_serial(samples_for_id, self.sample[0])
             label = self.make_serial(samples_for_id, self.sample[1])
-
             # Add to results
             results[id] = {
                 "input": self.normalize(self.transform(data).float()),
diff --git a/mindfultensors/utils.py b/mindfultensors/utils.py
index f46a6fa..750408b 100644
--- a/mindfultensors/utils.py
+++ b/mindfultensors/utils.py
@@ -86,7 +86,7 @@ class DBBatchSampler(Sampler):
 
     data_source: Sized
 
-    def __init__(self, data_source, batch_size=1, seed=None):
+    def __init__(self, data_source, batch_size=1, seed=None, shuffle=True):
         """TODO describe function
 
         :param data_source: a dataset of Dataset class
@@ -98,6 +98,7 @@ def __init__(self, data_source, batch_size=1, seed=None):
         self.data_source = data_source
         self.data_size = len(self.data_source)
         self.seed = seed
+        self.shuffle = shuffle
 
     def __chunks__(self, l, n):
         for i in range(0, len(l), n):
@@ -106,9 +107,12 @@ def __chunks__(self, l, n):
     def __iter__(self):
         if self.seed is not None:
             np.random.seed(self.seed)
-        return self.__chunks__(
-            np.random.permutation(self.data_size), self.batch_size
-        )
+        if self.shuffle:
+            return self.__chunks__(
+                np.random.permutation(self.data_size), self.batch_size
+            )
+        else:
+            return self.__chunks__(range(self.data_size), self.batch_size)
 
     def __len__(self):
         return (