MeasurementSet

class lsst.verify.MeasurementSet(measurements=None)

Bases: lsst.verify.jsonmixin.JsonSerializationMixin

A collection of Measurements of Metrics.

MeasurementSet provides a dict-like interface for getting, setting, and iterating over Measurements.

Parameters:

measurements : list of lsst.verify.Measurements

Measurements to include in the set.

Attributes Summary

json	A dict that can be serialized as JSON.

Methods Summary

deserialize([measurements, blob_set, metric_set])	Create a measurement set from a parsed JSON dataset.
insert(measurement)	Insert a measurement into the set.
items()	Iterete over (Name, Measurement) pairs in the set.
jsonify_dict(d)	Recursively build JSON-renderable objects on all values in a dict.
keys()	Get a sequence of metric names contained in the measurement set.
refresh_metrics(metric_set)	Refresh Measurement.metric attributes in Measurements contained by this set.
update(other)	Merge another MeasurementSet into this one.
write_json(filepath)	Write JSON to a file.

Attributes Documentation

json

A dict that can be serialized as JSON.

Methods Documentation

classmethod deserialize(measurements=None, blob_set=None, metric_set=None)

Create a measurement set from a parsed JSON dataset.

Parameters:

measurements : list, optional

A list of Measurement JSON serializations.

blob_set : BlobSet, optional

A BlobSet instance that support measurement deserialization.

metric_set : MetricSet, optional

A MetricSet that supports measurement deserialization. If provided, measurements are validated for unit consistency with metric definitions. Measurement instances also gain a Measurement.metric attribute.

Returns:

instance : MeasurementSet

A MeasurementSet instance.

insert(measurement)

Insert a measurement into the set.

items()

Iterete over (Name, Measurement) pairs in the set.

Yields:

item : tuple

Tuple containing:

• Name of the measurement’s Metric.
• Measurement instance.

static jsonify_dict(d)

Recursively build JSON-renderable objects on all values in a dict.

Parameters:

d : dict

Dictionary to convert into a JSON-serializable object. Values are recursively JSON-ified.

Returns:

json_dict : dict

Dictionary that can be serialized to JSON.

Examples

Subclasses can use this method to prepare output in their json-method implementation. For example:

def json(self):
    return JsonSerializationMixin.jsonify_dict({
        'value': self.value,
    })

keys()

Get a sequence of metric names contained in the measurement set.

Returns:

keys : sequence of Name

Sequence of names of metrics for measurements in the set.

refresh_metrics(metric_set)

Refresh Measurement.metric attributes in Measurements contained by this set.

Parameters:

metric_set : MetricSet

Metrics from this set are inserted into corresponding Measurements contained in this MeasurementSet.

See also

lsst.verify.Job.reload_metrics_package

Notes

This method is especially useful for inserting Metric instances into Measurements that weren’t originally created with Metric instances. By including a Metric in a Measurement, the serialized units of a measurment are normalized to the metric’s definition.

update(other)

Merge another MeasurementSet into this one.

Parameters:

other : MeasurementSet

Another MeasurementSet. Measurements in other that do exist in this set are added to this one. Measurements in other replace measurements of the same metric in this one.

write_json(filepath)

Write JSON to a file.

Parameters:

filepath : str

Destination file name for JSON output.