Test all available platforms automatically

.github/workflows/rules.yml

@@ -33,7 +33,7 @@ jobs:
         pylint src -E -d E1123,E1120
     - name: Test with pytest core
       run: |
-        pytest --cov=qibo --cov-report=xml --pyargs qibo --durations=60
+        pytest src/qibo/tests/ --skip-parallel --cov=qibo --cov-report=xml --pyargs qibo --durations=60
     - name: Test documentation examples
       if: startsWith(matrix.os, 'ubuntu')
       run: |

src/qibo/core/gates.py

@@ -1064,7 +1064,7 @@ def cache(self):
             cache = K.create_gate_cache(self)
 
             qubits = sorted(self.nqubits - q - 1 for q in self.target_qubits)
-            cache.qubits_tensor = qubits + [q + self.nqubits for q in qubits]
+            cache.qubits_tensor = K.cast(qubits + [q + self.nqubits for q in qubits], dtype="int32")
             cache.target_qubits_dm = self.qubits + tuple(q + self.nqubits for q in self.qubits)
 
             if not K.is_custom:

src/qibo/optimizers.py

@@ -129,7 +129,7 @@ def newtonian(loss, initial_parameters, args=(), method='Powell',
             ``scipy.optimize.minimize``.
         processes (int): number of processes when using the parallel BFGS method.
     """
-    if method == 'parallel_L-BFGS-B':
+    if method == 'parallel_L-BFGS-B':  # pragma: no cover
         from qibo.parallel import _check_parallel_configuration
         _check_parallel_configuration(processes)
         o = ParallelBFGS(loss, args=args, processes=processes,

src/qibo/parallel.py

@@ -76,7 +76,7 @@ def _executor(params): # pragma: no cover
     return ParallelResources().run(params)
 
 
-def parallel_execution(circuit, states, processes=None):
+def parallel_execution(circuit, states, processes=None):  # pragma: no cover
     """Execute circuit for multiple states.
 
     Example:
@@ -128,12 +128,12 @@ def operation(state, circuit): # pragma: no cover
     return results
 
 
-def parallel_parametrized_execution(circuit, parameters, initial_state=None, processes=None):
+def parallel_parametrized_execution(circuit, parameters, initial_state=None, processes=None):  # pragma: no cover
     """Execute circuit for multiple parameters and fixed initial_state.
 
     Example:
         .. testcode::
-            
+
             import qibo
             original_backend = qibo.get_backend()
             qibo.set_backend("qibotf")
@@ -191,7 +191,7 @@ def operation(params, circuit, state): # pragma: no cover
     return results
 
 
-def _check_parallel_configuration(processes):
+def _check_parallel_configuration(processes):  # pragma: no cover
     """Check if configuration is suitable for efficient parallel execution."""
     import sys, psutil
     from qibo import get_device, get_backend, get_threads

src/qibo/tests/conftest.py

@@ -6,15 +6,13 @@
 import sys
 import pytest
 import qibo
+from qibo import K
 
-_available_backends = set(b.get('name') for b in qibo.K.profile.get('backends')
+_available_backends = set(b.get('name') for b in K.profile.get('backends')
                           if (not b.get('is_hardware', False) and
-                          qibo.K.check_availability(b.get('name'))))
+                          K.check_availability(b.get('name'))))
 _available_backends.add("numpy")
-_ACCELERATORS = None
-for bkd in _available_backends:
-    if qibo.K.construct_backend(bkd).supports_multigpu:
-        _ACCELERATORS = "2/GPU:0,1/GPU:0+1/GPU:1,2/GPU:0+1/GPU:1+1/GPU:2"
+_ACCELERATORS = "2/GPU:0,1/GPU:0+1/GPU:1,2/GPU:0+1/GPU:1+1/GPU:2"
 _BACKENDS = ",".join(_available_backends)
 
 
@@ -43,14 +41,23 @@ def pytest_addoption(parser):
     # `test_backends_agreement.py` tests that backend methods agree between
     # different backends by testing each backend in `--backends` with the
     # `--target-backend`
+    parser.addoption("--skip-parallel", action="store_true",
+                     help="Skip tests that use the ``qibo.parallel`` module.")
+    # parallel tests make the CI hang
 
 
 @pytest.fixture
-def backend(backend_name):
+def backend(backend_platform):
+    if "-" in backend_platform:
+        backend_name, platform_name = backend_platform.split("-")
+    else:
+        backend_name, platform_name = backend_platform, None
+
     original_backend = qibo.get_backend()
-    qibo.set_backend(backend_name)
+    original_platform = K.get_platform()
+    qibo.set_backend(backend_name, platform=platform_name)
     yield
-    qibo.set_backend(original_backend)
+    qibo.set_backend(original_backend, platform=original_platform)
 
 
 def pytest_generate_tests(metafunc):
@@ -70,11 +77,32 @@ def pytest_generate_tests(metafunc):
     the user when calling `pytest`.
     """
     backends = metafunc.config.option.backends.split(",")
-    accelerators = metafunc.config.option.accelerators
+    # construct backend instances to find what platforms each backend supports
+    # and if it supports multi-GPU
+    backend_platforms = [] # list of all available backend-platform pairs
+    distributed_backends = [] # list of backends that support multi-GPU
+    for name in backends:
+        instance = K.construct_backend(name)
+        for platform in instance.available_platforms:
+            if platform is not None:
+                total_name = f"{name}-{platform}"
+                instance.set_platform(platform)
+            else:
+                total_name = name
+            backend_platforms.append(total_name)
+            if instance.supports_multigpu:
+                distributed_backends.append(total_name)
+
+    # If a GPU platform is not available, we execute distributed tests with
+    # `qibojit-numba` for coverage purposes
+    #if not distributed_backends and "qibojit-numba" in backend_platforms:  # pragma: no cover
+    #    distributed_backends.append("qibojit-numba")
+
     # parse accelerator stings to dicts
-    if accelerators is not None:
-        accelerators = [{dev[1:]: int(dev[0]) for dev in x.split("+")}
-                        for x in accelerators.split(",")]
+    accelerators = metafunc.config.option.accelerators
+    accelerators = [{dev[1:]: int(dev[0]) for dev in x.split("+")}
+                    for x in accelerators.split(",")]
+
     distributed_tests = {
         "qibo.tests.test_core_states_distributed",
         "qibo.tests.test_core_distutils",
@@ -83,42 +111,47 @@ def pytest_generate_tests(metafunc):
     }
     module_name = metafunc.module.__name__
     # skip distributed tests if qibojit or qibotf are not installed
-    if ((module_name in distributed_tests) and ("qibotf" not in backends) and
-        ("qibojit" not in backends)): # pragma: no cover
+    if module_name in distributed_tests and not distributed_backends:  # pragma: no cover
         pytest.skip("Skipping distributed tests because are not supported by "
                     "the available backends.")
     # skip distributed tests on mac
     if sys.platform == "darwin":  # pragma: no cover
-        accelerators = None
-        if module_name in distributed_tests:
-            pytest.skip("macos does not support distributed circuits.")
+        # macos does not support distributed circuits
+        distributed_backends = []
+
+    if module_name in distributed_tests and not distributed_backends:  # pragma: no cover
+        pytest.skip("Skipping distributed tests because are not supported by "
+                    "available backends.")
+
+    # skip parallel tests if the ``--skip-parallel`` option is used
+    skip_parallel = metafunc.config.option.skip_parallel
+    if "skip_parallel" in metafunc.fixturenames:
+        metafunc.parametrize("skip_parallel", [skip_parallel])
 
     # for `test_backends_agreement.py`
     if "tested_backend" in metafunc.fixturenames:
         target = metafunc.config.option.target_backend
-        test_backends = [x for x in backends if x != target and x not in qibo.K.hardware_backends]
-        metafunc.parametrize("tested_backend", test_backends)
+        metafunc.parametrize("tested_backend", [x for x in backends if x != target])
         metafunc.parametrize("target_backend", [target])
 
     if "backend_name" in metafunc.fixturenames:
+        metafunc.parametrize("backend_name", backends)
+
+    if "backend_platform" in metafunc.fixturenames:
         if metafunc.module.__name__ in distributed_tests:
-            distributed_backends = list(set(backends) & {"qibotf", "qibojit"})
-            metafunc.parametrize("backend_name", distributed_backends)
+            metafunc.parametrize("backend_platform", distributed_backends)
             if "accelerators" in metafunc.fixturenames:
                 metafunc.parametrize("accelerators", accelerators)
 
         elif "accelerators" in metafunc.fixturenames:
             if accelerators is None: # pragma: no cover
                 # `accelerators` is never `None` in CI test execution
-                metafunc.parametrize("backend_name", backends)
+                metafunc.parametrize("backend_platform", backend_platforms)
                 metafunc.parametrize("accelerators", [None])
             else:
-                config = [(b, None) for b in backends]
-                if "qibotf" in backends:
-                    config.extend(("qibotf", d) for d in accelerators)
-                if "qibojit" in backends:
-                    config.extend(("qibojit", d) for d in accelerators)
-                metafunc.parametrize("backend_name,accelerators", config)
+                config = [(b, None) for b in backend_platforms]
+                config.extend((b, a) for b in distributed_backends for a in accelerators)
+                metafunc.parametrize("backend_platform,accelerators", config)
 
         else:
-            metafunc.parametrize("backend_name", backends)
+            metafunc.parametrize("backend_platform", backend_platforms)

src/qibo/tests/test_cirq.py

@@ -54,9 +54,12 @@ def assert_gates_equivalent(qibo_gate, cirq_gates, nqubits,
     if ndevices is not None:
         accelerators = {"/GPU:0": ndevices}
 
-    if accelerators and not K.supports_multigpu:
-        with pytest.raises(NotImplementedError):
-            c = models.Circuit(nqubits, accelerators)
+    if accelerators:
+        if not K.supports_multigpu:
+            with pytest.raises(NotImplementedError):
+                c = models.Circuit(nqubits, accelerators)
+        elif K.get_platform() == "numba" and len(K.available_platforms) > 1:  # pragma: no cover
+            pytest.skip("Skipping distributed cirq test for numba platform.")
     else:
         c = models.Circuit(nqubits, accelerators)
         c.add(qibo_gate)

src/qibo/tests/test_core_distcircuit_execution.py

@@ -39,7 +39,7 @@ def test_distributed_circuit_execution_pretransformed(backend, accelerators):
     initial_state = random_state(c.nqubits)
     final_state = dist_c(np.copy(initial_state))
     target_state = c(np.copy(initial_state))
-    K.assert_allclose(target_state, final_state)
+    K.assert_allclose(target_state, final_state, atol=1e-7)
 
 
 def test_distributed_circuit_execution_with_swap(backend, accelerators):
@@ -55,7 +55,7 @@ def test_distributed_circuit_execution_with_swap(backend, accelerators):
     initial_state = random_state(c.nqubits)
     final_state = dist_c(np.copy(initial_state))
     target_state = c(np.copy(initial_state))
-    K.assert_allclose(target_state, final_state)
+    K.assert_allclose(target_state, final_state, atol=1e-7)
 
 
 def test_distributed_circuit_execution_special_gate(backend, accelerators):
@@ -102,7 +102,7 @@ def test_distributed_circuit_execution_controlled_by_gates(backend, accelerators
     initial_state = random_state(c.nqubits)
     final_state = dist_c(np.copy(initial_state))
     target_state = c(np.copy(initial_state))
-    K.assert_allclose(target_state, final_state)
+    K.assert_allclose(target_state, final_state, atol=1e-7)
 
 
 def test_distributed_circuit_execution_addition(backend, accelerators):

src/qibo/tests/test_core_fusion.py

@@ -116,7 +116,7 @@ def test_random_circuit_fusion(backend, nqubits, ngates):
             q0, q1 = np.random.randint(0, nqubits, (2,))
         c.add(gate(q0, q1))
     fused_c = c.fuse()
-    K.assert_allclose(fused_c(), c())
+    K.assert_allclose(fused_c(), c(), atol=1e-7)
 
 
 def test_controlled_by_gates_fusion(backend):

src/qibo/tests/test_models_qgan.py

@@ -85,14 +85,16 @@ def set_params(circuit, params, x_input, i):
     qibo.set_backend(original_backend)
 
 
-def test_qgan_errors():
+def test_qgan_errors(backend_name):
     if not K.check_availability("tensorflow"):  # pragma: no cover
         pytest.skip("Skipping StyleQGAN test because tensorflow backend is not available.")
 
     original_backend = qibo.get_backend()
-    qibo.set_backend("qibojit")
-    with pytest.raises(RuntimeError):
-        qgan = models.StyleQGAN(latent_dim=2)
+
+    if backend_name != "tensorflow":
+        qibo.set_backend(backend_name)
+        with pytest.raises(RuntimeError):
+            qgan = models.StyleQGAN(latent_dim=2)
 
     qibo.set_backend("tensorflow")
     with pytest.raises(ValueError):

src/qibo/tests/test_models_variational.py

@@ -86,20 +86,19 @@ def myloss(parameters, circuit, target):
                ("sgd", {"nepochs": 5}, False, None),
                ("sgd", {"nepochs": 5}, True, None)]
 @pytest.mark.parametrize(test_names, test_values)
-def test_vqe(backend, method, options, compile, filename):
+def test_vqe(backend, method, options, compile, filename, skip_parallel):
     """Performs a VQE circuit minimization test."""
     original_threads = qibo.get_threads()
     if (method == "sgd" or compile) and qibo.get_backend() != "tensorflow":
         pytest.skip("Skipping SGD test for unsupported backend.")
 
-    if method == 'parallel_L-BFGS-B':
-        device = qibo.get_device()
-        backend = qibo.get_backend()
-        if backend == "tensorflow" or backend == "qibojit" or "GPU" in device:
-            pytest.skip("unsupported configuration")
-        import sys
-        if sys.platform == 'win32' or sys.platform == 'darwin': # pragma: no cover
-            pytest.skip("Parallel L-BFGS-B only supported on linux.")
+    if method == 'parallel_L-BFGS-B':  # pragma: no cover
+        if skip_parallel:
+            pytest.skip("Skipping parallel test.")
+        from qibo.tests.test_parallel import is_parallel_supported
+        backend_name = qibo.get_backend()
+        if not is_parallel_supported(backend_name):
+            pytest.skip("Skipping parallel test due to unsupported configuration.")
         qibo.set_threads(1)
 
     nqubits = 6
@@ -313,18 +312,17 @@ def __call__(self, x):
                ("cma", {"maxfevals": 2}, False, None),
                ("parallel_L-BFGS-B", {'maxiter': 1}, False, None)]
 @pytest.mark.parametrize(test_names, test_values)
-def test_aavqe(backend, method, options, compile, filename):
+def test_aavqe(backend, method, options, compile, filename, skip_parallel):
     """Performs a AAVQE circuit minimization test."""
     original_threads = qibo.get_threads()
 
-    if method == 'parallel_L-BFGS-B':
-        device = qibo.get_device()
-        backend = qibo.get_backend()
-        if backend == "tensorflow" or backend == "qibojit" or "GPU" in device:
-            pytest.skip("unsupported configuration")
-        import sys
-        if sys.platform == 'win32' or sys.platform == 'darwin': # pragma: no cover
-            pytest.skip("Parallel L-BFGS-B only supported on linux.")
+    if method == 'parallel_L-BFGS-B':  # pragma: no cover
+        if skip_parallel:
+            pytest.skip("Skipping parallel test.")
+        from qibo.tests.test_parallel import is_parallel_supported
+        backend_name = qibo.get_backend()
+        if not is_parallel_supported(backend_name):
+            pytest.skip("Skipping parallel test due to unsupported configuration.")
         qibo.set_threads(1)
     nqubits = 6
     layers  = 4
@@ -346,7 +344,7 @@ def test_aavqe(backend, method, options, compile, filename):
     easy_hamiltonian=hamiltonians.X(nqubits)
     problem_hamiltonian=hamiltonians.XXZ(nqubits)
     s = lambda t: t
-    aavqe = models.AAVQE(circuit, easy_hamiltonian, problem_hamiltonian, 
+    aavqe = models.AAVQE(circuit, easy_hamiltonian, problem_hamiltonian,
                         s, nsteps=10, t_max=1)
     np.random.seed(0)
     initial_parameters = np.random.uniform(0, 2*np.pi, 2*nqubits*layers + nqubits)
@@ -359,4 +357,3 @@ def test_aavqe(backend, method, options, compile, filename):
     if filename is not None:
         assert_regression_fixture(params, filename, rtol=1e-2)
     qibo.set_threads(original_threads)
-

src/qibo/tests/test_parallel.py

@@ -10,12 +10,24 @@
 from qibo.parallel import parallel_parametrized_execution, parallel_execution
 
 
-def test_parallel_circuit_evaluation(backend):
+def is_parallel_supported(backend_name):  # pragma: no cover
+    if "GPU" in qibo.get_device():
+        return False
+    if backend_name in ("tensorflow", "qibojit"):
+        return False
+    if sys.platform in ("darwin", "win32"):
+        return False
+    return True
+
+
+def test_parallel_circuit_evaluation(backend, skip_parallel):  # pragma: no cover
     """Evaluate circuit for multiple input states."""
     device = qibo.get_device()
-    backend = qibo.get_backend()
-    if 'GPU' in qibo.get_device() or sys.platform == "win32" or sys.platform == "darwin" or backend == "tensorflow" or backend == "qibojit": # pragma: no cover
-        pytest.skip("unsupported configuration")
+    backend_name = qibo.get_backend()
+    if skip_parallel:
+        pytest.skip("Skipping parallel test.")
+    if not is_parallel_supported(backend_name):
+        pytest.skip("Skipping parallel test due to unsupported configuration.")
     original_threads = qibo.get_threads()
     qibo.set_threads(1)
 
@@ -34,12 +46,14 @@ def test_parallel_circuit_evaluation(backend):
     qibo.set_threads(original_threads)
 
 
-def test_parallel_parametrized_circuit(backend):
+def test_parallel_parametrized_circuit(backend, skip_parallel):  # pragma: no cover
     """Evaluate circuit for multiple parameters."""
     device = qibo.get_device()
-    backend = qibo.get_backend()
-    if 'GPU' in qibo.get_device() or sys.platform == "win32" or sys.platform == "darwin" or backend == "tensorflow" or backend == "qibojit": # pragma: no cover
-        pytest.skip("unsupported configuration")
+    backend_name = qibo.get_backend()
+    if skip_parallel:
+        pytest.skip("Skipping parallel test.")
+    if not is_parallel_supported(backend_name):
+        pytest.skip("Skipping parallel test due to unsupported configuration.")
     original_threads = qibo.get_threads()
     qibo.set_threads(1)