ProtocolGroup

class openff.evaluator.workflow.ProtocolGroup(protocol_id)[source]

A group of workflow protocols to be executed in one batch.

This may be used for example to cluster together multiple protocols that will execute in a linear chain so that multiple scheduler execution calls are reduced into a single one.

Additionally, a group may provide enhanced behaviour, for example running all protocols within the group self consistently until a given condition is met (e.g run a simulation until a given observable has converged).

__init__(protocol_id)[source]: Constructs a new ProtocolGroup.

Methods

`__init__`(protocol_id)	Constructs a new ProtocolGroup.
`add_protocols`(*protocols)	Add protocols to this group.
`apply_replicator`(replicator, template_values)	Applies a ProtocolReplicator to this protocol.
`can_merge`(other[, path_replacements])	Determines whether this protocol can be merged with another.
`execute`([directory, available_resources])	Execute the protocol.
`from_json`(file_path)	Create this object from a JSON file.
`from_schema`(schema)	Initializes a protocol from it's schema definition.
`get_attributes`([attribute_type])	Returns all attributes of a specific attribute_type.
`get_class_attribute`(reference_path)	Returns one of this protocols, or any of its children's, attributes directly (rather than its value).
`get_value`(reference_path)	Returns the value of one of this protocols inputs / outputs.
`get_value_references`(input_path)	Returns a dictionary of references to the protocols which one of this protocols inputs (specified by input_path) takes its value from.
`json`([file_path, format])	Creates a JSON representation of this class.
`merge`(other)	Merges another Protocol with this one.
`parse_json`(string_contents)	Parses a typed json string into the corresponding class structure.
`replace_protocol`(old_id, new_id)	Finds each input which came from a given protocol
`set_uuid`(value)	Store the uuid of the calculation this protocol belongs to
`set_value`(reference_path, value)	Sets the value of one of this protocols inputs.
`validate`([attribute_type])	Validate the values of the attributes.

Attributes

`allow_merging`	Input - Defines whether this protocols is allowed to merge with other protocols.
`dependencies`	A list of pointers to the protocols which this protocol takes input from.
`id`	The unique id of this protocol.
`outputs`	A dictionary of the outputs of this property.
`protocols`	A dictionary of the protocols in this groups, where the dictionary key is the protocol id, and the value is the protocol itself.
`required_inputs`	The inputs which must be set on this protocol.
`schema`	A serializable schema for this object.

property required_inputs

The inputs which must be set on this protocol.

Type: list of ProtocolPath

property dependencies

A list of pointers to the protocols which this protocol takes input from.

Type: list of ProtocolPath

property outputs

A dictionary of the outputs of this property.

Type: dict of ProtocolPath and Any

property protocols

A dictionary of the protocols in this groups, where the dictionary key is the protocol id, and the value is the protocol itself.

Notes

This property should not be altered. Use add_protocols to add new protocols to the group.

Type: dict of str and Protocol

add_protocols(*protocols)[source]

Add protocols to this group.

Parameters: protocols (Protocol) – The protocols to add.

set_uuid(value)[source]

Store the uuid of the calculation this protocol belongs to

Parameters: value (str) – The uuid of the parent calculation.

replace_protocol(old_id, new_id)[source]

Finds each input which came from a given protocol: and redirects it to instead take input from a different one.

Parameters

old_id (str) – The id of the old input protocol.
new_id (str) – The id of the new input protocol.

can_merge(other, path_replacements=None)[source]

Determines whether this protocol can be merged with another.

Parameters

other (Protocol) – The protocol to compare against.
path_replacements (list of tuple of str, optional) – Replacements to make in any value reference protocol paths before comparing for equality.

Returns

True if the two protocols are safe to merge.

Return type

bool

merge(other)[source]

Merges another Protocol with this one. The id of this protocol will remain unchanged.

Parameters: other (Protocol) – The protocol to merge into this one.
Returns: A map between any original protocol ids and their new merged values.
Return type: Dict[str, str]

get_value_references(input_path)[source]

Returns a dictionary of references to the protocols which one of this protocols inputs (specified by input_path) takes its value from.

Notes

Currently this method only functions correctly for an input value which is either currently a ProtocolPath, or a list / dict which contains at least one ProtocolPath.

Parameters: input_path (ProtocolPath) – The input value to check.
Returns: A dictionary of the protocol paths that the input targeted by input_path depends upon.
Return type: dict of ProtocolPath and ProtocolPath

get_class_attribute(reference_path)[source]

Returns one of this protocols, or any of its children’s, attributes directly (rather than its value).

Parameters: reference_path (ProtocolPath) – The path pointing to the attribute to return.
Returns: The class attribute.
Return type: object

get_value(reference_path)[source]

Returns the value of one of this protocols inputs / outputs.

Parameters: reference_path (ProtocolPath) – The path pointing to the value to return.
Returns: The value of the input / output
Return type: Any

allow_merging

Input - Defines whether this protocols is allowed to merge with other protocols. The default value of this attribute is True.

Type: bool

execute(directory='', available_resources=None)

Execute the protocol.

Parameters

directory (str) – The directory to store output data in.
available_resources (ComputeResources) – The resources available to execute on. If None, the protocol will be executed on a single CPU.

classmethod from_json(file_path)

Create this object from a JSON file.

Parameters: file_path (str) – The path to load the JSON from.
Returns: The parsed class.
Return type: cls

classmethod from_schema(schema)

Initializes a protocol from it’s schema definition.

Parameters: schema (ProtocolSchema) – The schema to initialize the protocol using.
Returns: The initialized protocol.
Return type: cls

classmethod get_attributes(attribute_type=None)

Returns all attributes of a specific attribute_type.

Parameters: attribute_type (type of Attribute, optional) – The type of attribute to search for.
Returns: The names of the attributes of the specified type.
Return type: list of str

id

The unique id of this protocol. The default value of this attribute is not set and must be set by the user..

Type: str

json(file_path=None, format=False)

Creates a JSON representation of this class.

Parameters

file_path (str, optional) – The (optional) file path to save the JSON file to.
format (bool) – Whether to format the JSON or not.

Returns

The JSON representation of this class.

Return type

str

classmethod parse_json(string_contents)

Parses a typed json string into the corresponding class structure.

Parameters: string_contents (str or bytes) – The typed json string.
Returns: The parsed class.
Return type: Any

property schema

A serializable schema for this object.

Type: ProtocolSchema

set_value(reference_path, value)[source]

Sets the value of one of this protocols inputs.

Parameters

reference_path (ProtocolPath) – The path pointing to the value to return.
value (Any) – The value to set.

validate(attribute_type=None)

Validate the values of the attributes. If attribute_type is set, only attributes of that type will be validated.

Parameters: attribute_type (type of Attribute, optional) – The type of attribute to validate.
Raises: ValueError or AssertionError –

apply_replicator(replicator, template_values, template_index=- 1, template_value=None, update_input_references=False)[source]

Applies a ProtocolReplicator to this protocol. This method should clone any protocols whose id contains the id of the replicator (in the format $(replicator.id)).

Parameters

replicator (ProtocolReplicator) – The replicator to apply.
template_values (list of Any) –
A list of the values which will be inserted into the newly replicated protocols.

This parameter is mutually exclusive with template_index and template_value
template_index (int, optional) –
A specific value which should be used for any protocols flagged as to be replicated by the replicator. This option is mainly used when replicating children of an already replicated protocol.

This parameter is mutually exclusive with template_values and must be set along with a template_value.
template_value (Any, optional) –
A specific index which should be used for any protocols flagged as to be replicated by the replicator. This option is mainly used when replicating children of an already replicated protocol.

This parameter is mutually exclusive with template_values and must be set along with a template_index.
update_input_references (bool) –
If true, any protocols which take their input from a protocol which was flagged for replication will be updated to take input from the actually replicated protocol. This should only be set to true if this protocol is not nested within a workflow or a protocol group.

This option cannot be used when a specific template_index or template_value is providied.

Returns

A dictionary of references to all of the protocols which have been replicated, with keys of original protocol ids. Each value is comprised of a list of the replicated protocol ids, and their index into the template_values array.

Return type

dict of ProtocolPath and list of tuple of ProtocolPath and int