Following the weak_supervision.ipynb

[gerileka]

LABEL_STUDIO_URL  = 'http://localhost:8080'
LABEL_STUDIO_API_KEY  = 'XXXXXXX'

from label_studio_sdk import Client

ls = Client(url=LABEL_STUDIO_URL, api_key=LABEL_STUDIO_API_KEY)
ls.check_connection()

from label_studio_sdk.project import ProjectSampling

project = ls.start_project(
    title='AL Project Created from SDK',
    label_config='''
    <View>
    <Text name="text" value="$text"/>
    <Choices name="sentiment" toName="text" choice="single" showInLine="true">
        <Choice value="Positive"/>
        <Choice value="Negative"/>
        <Choice value="Neutral"/>
    </Choices>
    </View>
    '''
)


project.set_sampling(ProjectSampling.UNCERTAINTY)

import pandas as pd

tasks = pd.read_csv('https://raw.githubusercontent.com/jdvelasq/datalabs/master/datasets/amazon_cells_labelled.tsv', sep='\t')
tasks.rename(columns={tasks.columns[0]:"text",tasks.columns[1]:"value"},inplace=True)
tasks = tasks.to_dict('records') 

tasks_ids = project.import_tasks(tasks)

knowing that task look like this :

[{'text': 'So there is no way for me to plug it in here in the US unless I go by a converter.',
'value': 0.0},
{'text': 'Good case, Excellent value.', 'value': 1.0},
{'text': 'I thought Motorola made reliable products!.', 'value': nan},
{'text': 'Battery for Motorola Razr.', 'value': nan},
{'text': 'Great for the jawbone.', 'value': 1.0},
{'text': 'When I got this item it was larger than I thought It was the size of a small video game but bulky.',
'value': nan},
{'text': '(I looked for one that specifically said DCU-60 and said it supported USB 1 and 2.',
'value': nan}]

[gerileka]

apparently nan values are not accepted. Exemple this specific dict in the list :
{'text': 'I thought Motorola made reliable products!.', 'value': nan}

a fillna("") with empty resolved the problem