Merge pull request #30 from qctrl/lazy-loading

Lazy /Conditional loading of 3rd party Quantum libraries

Author: Rajib Chakravorty

qctrlopencontrols/cirq/circuit.py

@@ -20,14 +20,12 @@
 
 import numpy as np
 
-import cirq
-
 from ..dynamic_decoupling_sequences.dynamic_decoupling_sequence import DynamicDecouplingSequence
 from ..exceptions.exceptions import ArgumentsValueError
 from ..globals import (FIX_DURATION_UNITARY, INSTANT_UNITARY)
 
 
-def convert_dds_to_cirq_circuit(
+def convert_dds_to_cirq_circuit(    #pylint: disable=too-many-locals
         dynamic_decoupling_sequence,
         target_qubits=None,
         gate_time=0.1,
@@ -93,6 +91,8 @@ def convert_dds_to_cirq_circuit(
     any offset.
     """
 
+    import cirq
+
     if dynamic_decoupling_sequence is None:
         raise ArgumentsValueError('No dynamic decoupling sequence provided.',
                                   {'dynamic_decoupling_sequence': dynamic_decoupling_sequence})

qctrlopencontrols/cirq/schedule.py

@@ -20,13 +20,11 @@
 
 import numpy as np
 
-import cirq
-
 from ..dynamic_decoupling_sequences.dynamic_decoupling_sequence import DynamicDecouplingSequence
 from ..exceptions.exceptions import ArgumentsValueError
 
 
-def convert_dds_to_cirq_schedule(
+def convert_dds_to_cirq_schedule(   #pylint: disable=too-many-locals
         dynamic_decoupling_sequence,
         target_qubits=None,
         gate_time=0.1,
@@ -87,6 +85,8 @@ def convert_dds_to_cirq_schedule(
     any offset.
     """
 
+    import cirq
+
     if dynamic_decoupling_sequence is None:
         raise ArgumentsValueError('No dynamic decoupling sequence provided.',
                                   {'dynamic_decoupling_sequence': dynamic_decoupling_sequence})
@@ -146,8 +146,8 @@ def convert_dds_to_cirq_schedule(
         nonzero_pulse_counts = 3 - np.sum(zero_pulses)
         if nonzero_pulse_counts > 1:
             raise ArgumentsValueError(
-                'Open Controls support a sequence with one '
-                'valid pulse at any offset. Found sequence '
+                'Open Controls support a sequence with one'
+                'valid pulse at any offset. Found sequence'
                 'with multiple rotation operations at an offset.',
                 {'dynamic_decoupling_sequence': str(dynamic_decoupling_sequence),
                  'offset': dynamic_decoupling_sequence.offsets[op_idx],

qctrlopencontrols/pyquil/program.py

@@ -20,17 +20,13 @@
 
 import numpy as np
 
-from pyquil import Program
-from pyquil.gates import I, RX, RY, RZ, MEASURE
-from pyquil.quil import Pragma
-
 from ..dynamic_decoupling_sequences.dynamic_decoupling_sequence import DynamicDecouplingSequence
 from ..exceptions.exceptions import ArgumentsValueError
 from ..globals import (
     FIX_DURATION_UNITARY, INSTANT_UNITARY)
 
 
-def convert_dds_to_pyquil_program(
+def convert_dds_to_pyquil_program(  #pylint: disable=too-many-locals
         dynamic_decoupling_sequence,
         target_qubits=None,
         gate_time=0.1,
@@ -93,6 +89,10 @@ def convert_dds_to_pyquil_program(
     any offset.
     """
 
+    from pyquil import Program
+    from pyquil.gates import I, RX, RY, RZ, MEASURE
+    from pyquil.quil import Pragma
+
     if dynamic_decoupling_sequence is None:
         raise ArgumentsValueError('No dynamic decoupling sequence provided.',
                                   {'dynamic_decoupling_sequence': dynamic_decoupling_sequence})

qctrlopencontrols/qiskit/quantum_circuit.py

@@ -20,13 +20,9 @@
 
 import numpy as np
 
-from qiskit import (
-    QuantumRegister, ClassicalRegister, QuantumCircuit)
-from qiskit.qasm import pi
-
+from ..globals import (FIX_DURATION_UNITARY, INSTANT_UNITARY)
 from ..dynamic_decoupling_sequences.dynamic_decoupling_sequence import DynamicDecouplingSequence
 from ..exceptions.exceptions import ArgumentsValueError
-from ..globals import (FIX_DURATION_UNITARY, INSTANT_UNITARY)
 
 
 def convert_dds_to_qiskit_quantum_circuit(
@@ -97,6 +93,10 @@ def convert_dds_to_qiskit_quantum_circuit(
     any offset.
     """
 
+    from qiskit import (
+        QuantumRegister, ClassicalRegister, QuantumCircuit)
+    from qiskit.qasm import pi
+
     if dynamic_decoupling_sequence is None:
         raise ArgumentsValueError('No dynamic decoupling sequence provided.',
                                   {'dynamic_decoupling_sequence': dynamic_decoupling_sequence})

tests/test_qiskit_sequence.py

@@ -14,7 +14,7 @@
 
 """
 ===================================
-Tests converstion to Qiskit Circuit
+Tests conversion to Qiskit Circuit
 ===================================
 """
 
@@ -127,6 +127,5 @@ def test_identity_operation():
     _check_circuit_unitary(True, _multiplier, 'fixed duration unitary')
 
 
-
 if __name__ == '__main__':
     pass