Dataset Integration

This section covers the integration of the imdb dataset into Tensorleap. We'll later use this dataset with a classification model.

Dataset Script

Below is the full dataset script to be used in the integration. More information about the structure of this script can be found under Dataset Script.

from typing import List, Optional, Callable, Tuple, Dict

import json, os, re, string
from os.path import basename, dirname, join

import pandas as pd
import numpy as np
from google.auth.credentials import AnonymousCredentials
from google.cloud import storage
from google.cloud.storage import Bucket

from tensorflow.keras.preprocessing.sequence import pad_sequences
from tensorflow.keras.preprocessing.text import tokenizer_from_json
from pandas.core.frame import DataFrame as DataFrameType

# Tensorleap imports
from code_loader import leap_binder
from code_loader.contract.datasetclasses import PreprocessResponse
from code_loader.contract.enums import DatasetMetadataType, LeapDataType, Metric
from code_loader.contract.visualizer_classes import LeapText

NUMBER_OF_SAMPLES = 20000
BUCKET_NAME = 'example-datasets-47ml982d'
PROJECT_ID = 'example-dev-project-nmrksf0o'

### Helper Functions: ###
def _connect_to_gcs() -> Bucket:
    gcs_client = storage.Client(project=PROJECT_ID, credentials=AnonymousCredentials())
    return gcs_client.bucket(BUCKET_NAME)


def _download(cloud_file_path: str, local_file_path: Optional[str] = None) -> str:
    BASE_PATH = "imdb"
    cloud_file_path = join(BASE_PATH, cloud_file_path)
    # if local_file_path is not specified saving in home dir
    if local_file_path is None:
        home_dir = os.getenv("HOME")
        assert home_dir is not None
        local_file_path = os.path.join(home_dir, "Tensorleap_data", BUCKET_NAME, cloud_file_path)
    # check if file already exists
    if os.path.exists(local_file_path):
        return local_file_path

    bucket = _connect_to_gcs()
    dir_path = os.path.dirname(local_file_path)
    os.makedirs(dir_path, exist_ok=True)
    blob = bucket.blob(cloud_file_path)
    blob.download_to_filename(local_file_path)
    return local_file_path


def load_tokenizer(tokenizer_path: str):
    with open(tokenizer_path, 'r') as f:
        data = json.load(f)
        tokenizer = tokenizer_from_json(data)
    return tokenizer


def download_load_assets():
    cloud_path = join("assets", "imdb.csv")
    local_path = _download(cloud_path)
    df = pd.read_csv(local_path)
    cloud_path = join("assets", "tokenizer_v2.json")
    local_path = _download(cloud_path)
    tokenizer = load_tokenizer(local_path)
    return tokenizer, df


# Preprocess Function
def preprocess_func() -> List[PreprocessResponse]:
    tokenizer, df = download_load_assets()
    train_label_size = int(0.9 * NUMBER_OF_SAMPLES / 2)
    val_label_size = int(0.1 * NUMBER_OF_SAMPLES / 2)
    df = df[df['subset'] == 'train']
    train_df = pd.concat([df[df['gt'] == 'pos'][:train_label_size], df[df['gt'] == 'neg'][:train_label_size]], ignore_index=True)
    val_df = pd.concat([df[df['gt'] == 'pos'][train_label_size:train_label_size + val_label_size], df[df['gt'] == 'neg'][train_label_size:train_label_size + val_label_size]], ignore_index=True)
    ohe = {"pos": [1.0, 0.], "neg": [0., 1.0]}

    # Generate a PreprocessResponse for each data slice, to later be read by the encoders.
    # The length of each data slice is provided, along with the data dictionary.
    # In this example we pass `images` and `labels` that later are encoded into the inputs and outputs 
    train = PreprocessResponse(length=2 * train_label_size, data={"df": train_df, "tokenizer": tokenizer, "ohe": ohe})
    val = PreprocessResponse(length=2 * val_label_size, data={"df": val_df, "tokenizer": tokenizer, "ohe": ohe})
    response = [train, val]

    # Adding custom data to leap_binder for later usage within the visualizer function
    leap_binder.custom_tokenizer = tokenizer
    
    return response


# Input Encoder Helper Functions
def standardize(comment: str) -> str:
    lowercase = comment.lower()
    html_stripped = re.sub('<br />', ' ', lowercase)
    punctuation_stripped = re.sub('[%s]' % re.escape(string.punctuation), '', html_stripped)
    return punctuation_stripped


def prepare_input(tokanizer, input_text: str, sequence_length: int = 250) -> np.ndarray:
    standard_text = standardize(input_text)
    tokanized_input = tokanizer.texts_to_sequences([standard_text])
    padded_input = pad_sequences(tokanized_input, maxlen=sequence_length)
    return padded_input[0, ...]

# Input Encoder - fetches the text with the index `idx` from the `paths` array set in
# the PreprocessResponse's data. Returns a numpy array containing padded tokenized input. 
def input_tokens(idx: int, preprocess: PreprocessResponse) -> np.ndarray:
    comment_path = preprocess.data['df']['paths'][idx]
    local_path = _download(comment_path)
    with open(local_path, 'r') as f:
        comment = f.read()
    tokenizer = preprocess.data['tokenizer']
    padded_input = prepare_input(tokenizer, comment)
    return padded_input

# Ground Truth Encoder - fetches the label with the index `idx` from the `gt` array set in
# the PreprocessResponse's  data. Returns a numpy array containing a hot vector label correlated with the sample.
def gt_sentiment(idx: int, preprocess: PreprocessResponse) -> List[float]:
    gt_str = preprocess.data['df']['gt'][idx]
    return preprocess.data['ohe'][gt_str]


# Metadata functions allow to add extra data for a later use in analysis.
# This metadata adds the ground truth of each sample (not a hot vector).
def gt_metadata(idx: int, preprocess: PreprocessResponse) -> str:
    if preprocess.data['df']['gt'][idx] == "pos":
        return "positive"
    else:
        return "negative"

# Visualizer functions define how to interpet the data and visualize it.
# In this example we define a tokens-to-text visualizer.
def text_visualizer_func(data: np.ndarray) -> LeapText:
    tokenizer = leap_binder.custom_tokenizer
    texts = tokenizer.sequences_to_texts([data])
    return LeapText(texts[0].split(' '))


# Binders
leap_binder.set_preprocess(function=preprocess_func)
leap_binder.set_input(function=input_tokens, name='tokens')
leap_binder.set_ground_truth(function=gt_sentiment, name='sentiment')
leap_binder.set_metadata(function=gt_metadata, metadata_type=DatasetMetadataType.string, name='gt')
leap_binder.set_visualizer(function=text_visualizer_func, visualizer_type=LeapDataType.Text, name='text_from_token')
leap_binder.add_prediction(name='sentiment', labels=['positive','negative'])

Add Integration Script

Add a Dataset Using UI

To add a new Dataset:

  1. Navigate to the Resources Management and click on the button.

  2. In the Dataset Editor, enter these properties:

    • Dataset Name: imdb

    • Script: copy and paste the script from the Dataset Script above

  3. Click Save.

Dataset Instance

After saving the imdb dataset, the platform will automatically parse the database script. This process evaluates the script and ensures that all its functions, including the ability to successfully read the data, are working as expected.

Upon successful parsing, the details of the MNIST dataset will be displayed on the right. In case of unsuccessful parsing, errors will be shown instead.

Up Next - Model Integration

The purpose of this section was to help you define a dataset script and create a dataset instance in Tensorleap.

Now that the imdb dataset has been integrated into Tensorleap, we can use it with a classification model. That's what we'll do in the next section, where we'll build a classification model.

When ready, move on to Model Integration.

PreviousIMDB GuideNextModel Integration

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