JSONDecodeError when callin run_circuit

[BrunoLiegiBastonLiegi]

Some qibo-cloud-backends tests are failing due to qibo-client qiboteam/qibo-cloud-backends#37.
I am using qibo-client 0.0.9 and running a circuit raises JSONDecodeError: Expecting value: line 2 column 1 (char 1).
The example in the README fails for instance.

[scarrazza]

I confirm, @marcorossi5 could you please have a look asap?

[marcorossi5]

Yes, he is not using the latest qibo-client version. We have not released it yet (0.0.10). Let me check everything is working and we can make the release. Can you confirm that the qibo version you just released is 0.2.12?

[scarrazza]

I have just tried in PR #65 but it does not work too, same error.

[marcorossi5]

The former example was:

import qibo
from qibo_client import Client

circuit = qibo.models.QFT(5)
token_path = Path(__file__).parent / "token.txt"
token = token_path.read_text()
client = Client(token)
job = client.run_circuit(circuit, nshots=100, device="sim")

r = job.result(verbose=True)
print(r.frequencies())

We should replace by this working example

import qibo
from qibo_client import Client

circuit = qibo.Circuit(5)
circuit.add(qibo.gates.M(0))

token_path = Path(__file__).parent / "token.txt"
token = token_path.read_text()
client = Client(token)
job = client.run_circuit(circuit, nshots=100, device="sim")

r = job.result(verbose=True)
print(r.frequencies())

Any idea on why models.QFT is not working?

[scarrazza]

In principle we should be able to support circuit simulations without measurement gates (for sim partitions) and with measurement gates for hardware partitions.

[marcorossi5]

Ok, we can add some sort of check in the webapp for that.

However, why is QFT circuit giving problems? Is it somehow deprecated or similar?

[scarrazza]

As discussed, if you don't add the M gate, you should not expect samples/frequencies but just the state vector.

[scarrazza]

I have just tested main and the latest release and for both setups I get the same failure.