def set_tasks_to_datatable(self, dim, task):
for column in self.vl_spec["hconcat"]:
if task["task"] == 'filter':
if task["operator"] == 'IN':
for attr in task['attributes']:
column['transform'].append({
'filter': {
"field": attr,
"oneOf": task["values"]
}
})
elif task["operator"] == 'RANGE':
for attr in task['attributes']:
column['transform'].append({
"filter": {
"field": attr,
"range": task["values"]
}
})
elif task["operator"] == 'NOT RANGE':
for attr in task['attributes']:
# self.vl_spec['transform'].append({"filter": {"field": attr, "gte": task["values"][1], "lte": task["values"][0]}})
column['transform'].append({
"filter": {
"not": {
"field": attr,
"range": task["values"]
}
}
})
else:
for attr in task['attributes']:
symbol = constants.operator_symbol_mapping[
task["operator"]]
if helpers.isfloat(task["values"][0]) or helpers.isint(
task["values"][0]):
column['transform'].append({
'filter':
'lower(datum["{}"]) {} {}'.format(
attr, symbol, task["values"][0])
})
elif helpers.isdate(task["values"][0]):
column['transform'].append({
'filter':
'lower(datum["{}"]) {} "{}"'.format(
attr, symbol, task["values"][0])
})
def set_data(self, data_url=None):
# type: (str) -> bool
"""
User can choose to manually initialize data
"""
self.nl4dv_instance.data_url = data_url
# initialize values
self.data_attribute_map = dict()
self.data = list()
self.rows = 0
if self.nl4dv_instance.data_url is not None and os.path.isfile(
self.nl4dv_instance.data_url):
# local variables
reader = None
json_data = None
attributes = list()
if self.nl4dv_instance.data_url.lower().endswith('.csv'):
reader = csv.reader(open(self.nl4dv_instance.data_url,
'r',
encoding='utf-8'),
delimiter=',')
attributes = next(
reader) # assumes headers are in the first line
elif self.nl4dv_instance.data_url.lower().endswith('.tsv'):
reader = csv.reader(open(self.nl4dv_instance.data_url,
'r',
encoding='utf-8'),
delimiter='\t')
attributes = next(
reader) # assumes headers are in the first line
elif self.nl4dv_instance.data_url.lower().endswith('.json'):
json_data = json.load(
open(self.nl4dv_instance.data_url, 'r', encoding='utf-8'))
attributes = json_data[0].keys()
# initialize properties in Attribute Map
for attr in attributes:
# Don't consider attribute names that are empty or just whitespaces
if attr and attr.strip():
self.data_attribute_map[attr] = {
'domain': set(),
'isLabelAttribute':
attr == self.nl4dv_instance.label_attribute,
'summary': dict(),
'dataTypeList':
list(), # temporary to determine datatype
'dataType': '',
'aliases': list(),
}
# initialize properties in Attribute Map
# implies file is either .csv or .tsv
if reader is not None:
for line in reader:
data_obj = dict()
for i in range(len(line)):
# Don't consider attribute names that are empty or just whitespaces
if attributes[i] and attributes[i].strip():
data_obj[attributes[i]] = line[i]
self.data.append(data_obj)
self.rows += 1
else:
# JSON file
for data_obj in json_data:
self.data.append(data_obj)
self.rows += 1
# infer attribute datatypes and compute summary (range, domain)
for datum in self.data:
for attr in self.data_attribute_map.keys():
attr_val = datum[attr]
# Check for Numeric (float, int)
if helpers.isfloat(attr_val) or helpers.isint(attr_val):
attr_datatype = constants.attribute_types[
'QUANTITATIVE']
self.populate_dataset_meta(attr, attr_val,
attr_datatype)
# Check for Datetime
# ToDo:- Works fine for datetime strings. Not for others like Epochs and Int-only Years (e.g. 2018) which get captured above.
# ToDo:- It is VERY risky to switch this elif block with the if block above
elif helpers.isdate(attr_val)[0]:
attr_datatype = constants.attribute_types['TEMPORAL']
self.populate_dataset_meta(attr, attr_val,
attr_datatype)
# Otherwise set as Nominal
else:
attr_datatype = constants.attribute_types['NOMINAL']
self.populate_dataset_meta(attr, attr_val,
attr_datatype)
# Irrespective of above assignment, make a list of attribute types for each data row
# to take best decision on heterogeneous data with multiple datatypes
self.data_attribute_map[attr]['dataTypeList'].append(
attr_datatype)
# Determine the Datatype based on majority of values.
# Also Override a few datatypes set above based on rules such as NOMINAL to ORDINAL if all values are unique such as Sr. 1, Sr. 2, ...
for attr in self.data_attribute_map:
# most common attribute type
attr_datatype = Counter(self.data_attribute_map[attr]
['dataTypeList']).most_common(1)[0][0]
# if it's quantitative but with less than or equal to 12 unique values, then it's ordinal.
# eg. 1, 2, 3, ..., 12 (months of a year)
# eg. -3, -2, -1, 0, 1, 2, 3 (likert ratings)
if attr_datatype == constants.attribute_types[
'QUANTITATIVE'] and len(
self.data_attribute_map[attr]['domain']) <= 12:
attr_datatype = constants.attribute_types['ORDINAL']
self.populate_dataset_meta_for_attr(attr, attr_datatype)
# If an attribute has (almnost) no repeating value, then mark it as the label attribute.
# eg. primary/unique key of the table? Car1 , Car2, Car3, ...
# Almost == 90% heuristic-based
if attr_datatype == constants.attribute_types[
'NOMINAL'] and len(self.data_attribute_map[attr]
['domain']) > 0.9 * self.rows:
self.nl4dv_instance.label_attribute = attr
self.data_attribute_map[attr]['isLabelAttribute'] = True
# Set the final data type
self.data_attribute_map[attr]['dataType'] = attr_datatype
# Presentation
self.prepare_output(attr, attr_datatype)
return True
return False
def set_data(self, data_url=None, data_value=None):
# type: (str) -> None
"""
User can choose to manually initialize data
"""
self.nl4dv_instance.data_url = data_url if data_url is not None else self.nl4dv_instance.data_url
self.nl4dv_instance.data_value = data_value if data_value is not None else self.nl4dv_instance.data_value
# initialize values
self.data_attribute_map = dict()
self.data = list()
self.rows = 0
if self.nl4dv_instance.data_url is not None:
# Possible Local FILE or HTTP URL
if self.nl4dv_instance.data_url.lower().endswith('.csv'):
self.data = pd.read_csv(self.nl4dv_instance.data_url,
sep=',').to_dict('records')
elif self.nl4dv_instance.data_url.lower().endswith('.tsv'):
self.data = pd.read_csv(self.nl4dv_instance.data_url,
sep='\t').to_dict('records')
elif self.nl4dv_instance.data_url.lower().endswith('.json'):
self.data = pd.read_json(
self.nl4dv_instance.data_url).to_dict('records')
elif self.nl4dv_instance.data_value is not None:
if isinstance(data_value, pd.DataFrame):
self.data = data_value.to_dict('records')
elif isinstance(data_value, list):
self.data = data_value
elif isinstance(data_value, dict):
self.data = pd.DataFrame(data_value).to_dict('records')
# Set number of rows in the dataset
self.rows = len(self.data)
# initialize properties in Attribute Map
if len(self.data) > 0:
for attr in self.data[0].keys():
# Don't consider attribute names that are empty or just whitespaces
if attr and attr.strip():
self.data_attribute_map[attr] = {
'domain': set(),
'domainMeta': dict(),
'isLabelAttribute':
attr == self.nl4dv_instance.label_attribute,
'summary': dict(),
'dataTypeList':
list(), # temporary to determine datatype
'dataType': '',
'dataTypeMeta': dict(
), # Used for for e.g., temporal attributes when they conform to a certain format
'aliases': list(),
}
# infer attribute datatypes and compute summary (range, domain)
for datum in self.data:
for attr in self.data_attribute_map.keys():
# Check for Datetime
is_date, unformatted_date_obj = helpers.isdate(datum[attr])
if is_date:
attr_datatype_for_majority = constants.attribute_types[
'TEMPORAL'] + "-" + str(
unformatted_date_obj["regex_id"])
# Check for Numeric (float, int)
elif helpers.isfloat(datum[attr]) or helpers.isint(
datum[attr]):
attr_datatype_for_majority = constants.attribute_types[
'QUANTITATIVE']
# Otherwise set as Nominal
else:
attr_datatype_for_majority = constants.attribute_types[
'NOMINAL']
# Append the list of attribute types for each data row to take best decision on heterogeneous data with multiple datatypes
self.data_attribute_map[attr]['dataTypeList'].append(
attr_datatype_for_majority)
# Determine the Datatype based on majority of values.
# Also Override a few datatypes set above based on rules such as NOMINAL to ORDINAL if all values are unique such as Sr. 1, Sr. 2, ...
for attr in self.data_attribute_map:
# By default, set the attribute datatype to the most common attribute
attr_datatype = Counter(self.data_attribute_map[attr]
['dataTypeList']).most_common(1)[0][0]
# If attr_datatype is Temporal (e.g., T-1, T-2, T-n where 'n' corresponds to the n'th index of the date_regex array.
# Then: PROCESS this and eventually strip the '-n' from the datatype
if not (attr_datatype in [
constants.attribute_types['QUANTITATIVE'],
constants.attribute_types['NOMINAL']
]):
# If there is at least one instance of 'T-2' (DD*MM*YY(YY)), in the `dataTypeList`, set the regex_id to this, even if 'T-1' is the majority.
if 'T-2' in self.data_attribute_map[attr]['dataTypeList']:
attr_datatype = 'T-2'
# Strip the '-n' from the datatype
attr_datatype_split = attr_datatype.split("-")
attr_datatype = attr_datatype_split[0]
# Set the final data type
self.data_attribute_map[attr]['dataTypeMeta'] = {
"regex_id": attr_datatype_split[1]
}
# Add raw data to the domain's metadata. Only for Temporal Attributes.
if not 'raw' in self.data_attribute_map[attr]['domainMeta']:
self.data_attribute_map[attr]['domainMeta']['raw'] = set()
# Set the final data type
self.data_attribute_map[attr]['dataType'] = attr_datatype
# Update the dataset metadata for each attribute
self.populate_dataset_meta_for_attr(attr, attr_datatype)
def set_task(self, dim, task):
if task["task"] == 'find_extremum':
if dim is None:
dim = 'y'
if task["operator"] == 'MIN':
if dim == 'x':
if 'y' in self.vl_spec['encoding']:
self.vl_spec['encoding']['y']['sort'] = 'x'
elif dim == 'y':
if 'x' in self.vl_spec['encoding']:
self.vl_spec['encoding']['x']['sort'] = 'y'
elif task["operator"] == 'MAX':
if dim == 'x':
if 'y' in self.vl_spec['encoding']:
self.vl_spec['encoding']['y']['sort'] = '-x'
elif dim == 'y':
if 'x' in self.vl_spec['encoding']:
self.vl_spec['encoding']['x']['sort'] = '-y'
elif task["task"] == 'filter':
if task["operator"] == 'IN':
for attr in task['attributes']:
self.vl_spec['transform'].append(
{'filter': {
"field": attr,
"oneOf": task["values"]
}})
elif task["operator"] == 'RANGE':
for attr in task['attributes']:
self.vl_spec['transform'].append(
{"filter": {
"field": attr,
"range": task["values"]
}})
elif task["operator"] == 'NOT RANGE':
for attr in task['attributes']:
# self.vl_spec['transform'].append({"filter": {"field": attr, "gte": task["values"][1], "lte": task["values"][0]}})
self.vl_spec['transform'].append({
"filter": {
"not": {
"field": attr,
"range": task["values"]
}
}
})
else:
for attr in task['attributes']:
symbol = constants.operator_symbol_mapping[
task["operator"]]
if helpers.isfloat(task["values"][0]) or helpers.isint(
task["values"][0]):
self.vl_spec['transform'].append({
'filter':
'lower(datum["{}"]) {} {}'.format(
attr, symbol, task["values"][0])
})
elif helpers.isdate(task["values"][0]):
self.vl_spec['transform'].append({
'filter':
'lower(datum["{}"]) {} "{}"'.format(
attr, symbol, task["values"][0])
})
def set_data(self, data_url=None, data_value=None):
# type: (str) -> None
"""
User can choose to manually initialize data
"""
self.nl4dv_instance.data_url = data_url if data_url is not None else self.nl4dv_instance.data_url
self.nl4dv_instance.data_value = data_value if data_value is not None else self.nl4dv_instance.data_value
# initialize values
self.data_attribute_map = dict()
self.data = list()
self.rows = 0
if self.nl4dv_instance.data_url is not None:
# Possible Local FILE or HTTP URL
if self.nl4dv_instance.data_url.lower().endswith('.csv'):
self.data = pd.read_csv(self.nl4dv_instance.data_url,
sep=',').to_dict('records')
elif self.nl4dv_instance.data_url.lower().endswith('.tsv'):
self.data = pd.read_csv(self.nl4dv_instance.data_url,
sep='\t').to_dict('records')
elif self.nl4dv_instance.data_url.lower().endswith('.json'):
self.data = pd.read_json(
self.nl4dv_instance.data_url).to_dict('records')
elif self.nl4dv_instance.data_value is not None:
if isinstance(data_value, pd.DataFrame):
self.data = data_value.to_dict('records')
elif isinstance(data_value, list):
self.data = data_value
elif isinstance(data_value, dict):
self.data = pd.DataFrame(data_value).to_dict('records')
# Set number of rows in the dataset
self.rows = len(self.data)
# initialize properties in Attribute Map
if len(self.data) > 0:
for attr in self.data[0].keys():
# Don't consider attribute names that are empty or just whitespaces
if attr and attr.strip():
self.data_attribute_map[attr] = {
'domain': set(),
'isLabelAttribute':
attr == self.nl4dv_instance.label_attribute,
'summary': dict(),
'dataTypeList':
list(), # temporary to determine datatype
'dataType': '',
'aliases': list(),
}
# infer attribute datatypes and compute summary (range, domain)
for datum in self.data:
for attr in self.data_attribute_map.keys():
attr_val = datum[attr]
# Check for Numeric (float, int)
if helpers.isfloat(attr_val) or helpers.isint(attr_val):
attr_datatype = constants.attribute_types['QUANTITATIVE']
self.populate_dataset_meta(attr, attr_val, attr_datatype)
# Check for Datetime
# ToDo:- Works fine for datetime strings. Not for others like Epochs and Int-only Years (e.g. 2018) which get captured above.
# ToDo:- It is VERY risky to switch this elif block with the if block above
elif helpers.isdate(attr_val)[0]:
attr_datatype = constants.attribute_types['TEMPORAL']
self.populate_dataset_meta(attr, attr_val, attr_datatype)
# Otherwise set as Nominal
else:
attr_datatype = constants.attribute_types['NOMINAL']
self.populate_dataset_meta(attr, attr_val, attr_datatype)
# Irrespective of above assignment, make a list of attribute types for each data row
# to take best decision on heterogeneous data with multiple datatypes
self.data_attribute_map[attr]['dataTypeList'].append(
attr_datatype)
# Determine the Datatype based on majority of values.
# Also Override a few datatypes set above based on rules such as NOMINAL to ORDINAL if all values are unique such as Sr. 1, Sr. 2, ...
for attr in self.data_attribute_map:
# most common attribute type
attr_datatype = Counter(self.data_attribute_map[attr]
['dataTypeList']).most_common(1)[0][0]
## NOTE: For all practical purposes, let QUANTITATIVE be the determined Data Type. If an attribute is known to be ORDINAL, it can be set using the set_attribute_datatype() API.
# # if it's quantitative but with less than or equal to 12 unique values, then it's ordinal.
# # eg. 1, 2, 3, ..., 12 (months of a year)
# # eg. -3, -2, -1, 0, 1, 2, 3 (likert ratings)
# if attr_datatype == constants.attribute_types['QUANTITATIVE'] and len(
# self.data_attribute_map[attr]['domain']) <= 12:
# attr_datatype = constants.attribute_types['ORDINAL']
# self.populate_dataset_meta_for_attr(attr, attr_datatype)
# If an attribute has (almnost) no repeating value, then mark it as the label attribute.
# eg. primary/unique key of the table? Car1 , Car2, Car3, ...
# Almost == 90% heuristic-based
if attr_datatype == constants.attribute_types['NOMINAL'] and len(
self.data_attribute_map[attr]['domain']) > 0.9 * self.rows:
self.nl4dv_instance.label_attribute = attr
self.data_attribute_map[attr]['isLabelAttribute'] = True
# Set the final data type
self.data_attribute_map[attr]['dataType'] = attr_datatype
# Presentation
self.prepare_output(attr, attr_datatype)