Fujitsu¶

Fujitsu DA4 Solver¶

Fujitsu DA4 is Fujitsu’s QUBO solver with the 4th-generation Digital Annealing Unit (DAU (GPU)).

Solver specification:

Client class	`amplify.FujitsuDA4Client`
Execution parameters	`amplify.FujitsuDA4Client.Parameters`
Execution result	`amplify.FujitsuDA4Client.Result`
Execution time	`amplify.FujitsuDA4Client.SolverTiming.solve_time`
API method	REST API (JSON)
API reference	📖 API Reference

	Binary variable	Ising variable	Integer variable	Real variable
Objective function	2nd	-	-	-
Equality constraint	/*	-	-	-
Inequality constraint	1st	-	-	-

*: One-way-one-hot and two-way-one-hot constraints are supported.
**: Can be specified as penalty functions.

Client class:

In addition to the common interface, the client class has the following attributes and methods.

Attribute	Data type	Details
`type_id`	`str` \| `None`	Specify the type ID when using the Premium API.
`set_penalty_binary_polynomial`	`bool`	Pass the penalty function weight setting for the constraint to the `penalty_binary_polynomial` parameter if set to `True` (default: `True`). If set to `False`, the penalty function is added to the objective function.
`set_inequalities`	`bool`	Pass a first-order inequality constraint to the `inequalities` parameter (default: `True`) if set to `True`. If set to `False`, a penalty function for the inequality constraint is generated and processed according to `set_penalty_binary_polynomial`.
`set_one_way_one_hot_groups`	`bool`	If set to `True`, detect one-hot constraints from the beginning of the decision variables as much as possible and pass them to the `one_way_one_hot_groups` parameter (default: `False`). If set to `False`, or if the one-hot constraints cannot be passed to the parameter, penalty functions are generated and processed according to `set_penalty_binary_polynomial`.
`set_two_way_one_hot_groups`	`bool`	If set to `True`, detect equally spaced `one_way_one_hot_groups`, and if additional one-hot constraints can be added that satisfy the `two_way_one_hot_groups` condition, they are detected and passed to the `two_way_one_hot_groups` parameter (default: `False`). If set to `False`, or if no one-hot constraints can be passed to the parameter, penalty functions are generated and processed according to `set_penalty_binary_polynomial`. If set to `True` at the same time as `set_one_way_one_hot_groups`, `two_way_one_hot_groups` detection is prioritized.

Method	Return type	Details
`health_check()`	`CommonError` \| `None`	Query the health check API and check if the solver is working properly. Returns `None` if normal.
`async_solve()`	`str`	Execute the `/async/qubo/solve` API asynchronously and return the job ID.
`get_jobs()`	`list`[`JobStatusInfo`]	Obtain a list of job statuses.
`cancel_job()`	`JobStatus`	Attempt to abort a job by specifying its job ID
`get_job_result()`	`Result`	Obtain the completed result by specifying the job ID.
`delete_job_result()`	`Result`	Obtain a completed result and delete the result by specifying the job ID.

Note

solve() in the common interface of the client class is a synchronous version of async_solve(). It waits until the job has completed execution and returns the result of the execution.

Configuration example:

from amplify import FujitsuDA4Client
from datetime import timedelta

client = FujitsuDA4Client()

# Set API token
client.token = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

# Enable detection of one-way one-hot groups
client.set_one_way_one_hot_groups = True

# Set the execution time to 100 seconds
client.parameters.time_limit_sec = timedelta(seconds=100)

Execution example:

from amplify import Model, VariableGenerator, solve

# Create decision variables and the objective function
g = VariableGenerator()
q = g.array("Binary", 2)
f = q[0] * q[1] + q[0] - q[1] + 1

# Create a model
model = Model(f)

# Run a solver
result = solve(model, client)

Perform health check API:

>>> client.health_check()

Obtain a list of jobs:

>>> client.get_jobs()
[FujitsuDA4ClientJobStatusInfo({"job_id":"...","job_status":"Done","start_time":"..."}),
 FujitsuDA4ClientJobStatusInfo({"job_id":"...","job_status":"Done","start_time":"..."})
 ...]

Obtain and delete job result:

>>> client.delete_job_result("...")
{"qubo_solution":{"progress":[{"energy":417.0,"penalty_energy":366429644.0,"time":1.179},...

Obtain the solver version:

>>> client.version
'v4'

Obtain detailed execution time:

>>> result.client_result.qubo_solution.timing
FujitsuDA4Client.SolverTiming({
"solve_time": 101963.0,
"total_elapsed_time": 101963.0
})

Fujitsu DA3c Solver¶

Fujitsu DA3c is Fujitsu’s QUBO solver with the 3rd-generation Digital Annealing Unit (DAU (GPU)).

Note

The client class specification is the same as amplify.FujitsuDA4Client.

Solver specification:

Client class	`amplify.FujitsuDA3cClient`
Execution parameters	`amplify.FujitsuDA3cClient.Parameters`
Execution result	`amplify.FujitsuDA3cClient.Result`
Execution time	`amplify.FujitsuDA3cClient.SolverTiming.solve_time`
API method	REST API (JSON)
API reference	📖 API Reference

	Binary variable	Ising variable	Integer variable	Real variable
Objective function	2nd	-	-	-
Equality constraint	/*	-	-	-
Inequality constraint	1st	-	-	-

*: One-way-one-hot and two-way-one-hot constraints are supported.
**: Can be specified as penalty functions.