Hello I have two sets of code, one from a .py file that has the important classes.
class QLSTM(nn.Module):
def __init__(self,
input_size,
hidden_size,
n_qubits=4,
n_qlayers=1,
n_vrotations=3,
batch_first=True,
return_sequences=False,
return_state=False,
noise = nm,
backend="qiskit.aer"):
super(QLSTM, self).__init__()
self.n_inputs = input_size
self.hidden_size = hidden_size
self.concat_size = self.n_inputs + self.hidden_size
self.n_qubits = n_qubits
self.n_qlayers = n_qlayers
self.n_vrotations = n_vrotations
self.backend = backend # "default.qubit", "qiskit.basicaer", "qiskit.ibm"
self.noise = noise
self.batch_first = batch_first
self.return_sequences = return_sequences
self.return_state = return_state
self.wires_forget = [f"wire_forget_{i}" for i in range(self.n_qubits)]
self.wires_input = [f"wire_input_{i}" for i in range(self.n_qubits)]
self.wires_update = [f"wire_update_{i}" for i in range(self.n_qubits)]
self.wires_output = [f"wire_output_{i}" for i in range(self.n_qubits)]
self.dev_forget = qml.device(self.backend, wires=self.wires_forget, noise_model = self.noise)
self.dev_input = qml.device(self.backend, wires=self.wires_input, noise_model = self.noise)
self.dev_update = qml.device(self.backend, wires=self.wires_update, noise_model = self.noise)
self.dev_output = qml.device(self.backend, wires=self.wires_update, noise_model = self.noise)
def ansatz(params, wires_type):
# Entangling layer.
for i in range(1, 3):
for j in range(self.n_qubits):
if j + i < self.n_qubits:
qml.CNOT(wires=[wires_type[j], wires_type[j + i]])
else:
qml.CNOT(wires=[wires_type[j], wires_type[j + i - self.n_qubits]])
# Variational layer.
for i in range(self.n_qubits):
qml.RX(params[0][i], wires=wires_type[i])
qml.RY(params[1][i], wires=wires_type[i])
qml.RZ(params[2][i], wires=wires_type[i])
def VQC(features, weights, wires_type):
# Preproccess input data to encode the initial state.
# qml.templates.AngleEmbedding(features, wires=wires_type)
ry_params = [torch.arctan(feature) for feature in features]
rz_params = [torch.arctan(feature ** 2) for feature in features]
for i in range(self.n_qubits):
qml.Hadamard(wires=wires_type[i])
qml.RY(ry_params[i], wires=wires_type[i])
qml.RZ(ry_params[i], wires=wires_type[i])
# Variational block.
qml.layer(ansatz, self.n_qlayers, weights, wires_type=wires_type)
def _circuit_forget(inputs, weights):
VQC(inputs, weights, self.wires_forget)
return [qml.expval(qml.PauliZ(wires=i)) for i in self.wires_forget]
self.qlayer_forget = qml.QNode(_circuit_forget, self.dev_forget, interface="torch")
def _circuit_input(inputs, weights):
VQC(inputs, weights, self.wires_input)
return [qml.expval(qml.PauliZ(wires=i)) for i in self.wires_input]
self.qlayer_input = qml.QNode(_circuit_input, self.dev_input, interface="torch")
def _circuit_update(inputs, weights):
VQC(inputs, weights, self.wires_update)
return [qml.expval(qml.PauliZ(wires=i)) for i in self.wires_update]
self.qlayer_update = qml.QNode(_circuit_update, self.dev_update, interface="torch")
def _circuit_output(inputs, weights):
VQC(inputs, weights, self.wires_output)
return [qml.expval(qml.PauliZ(wires=i)) for i in self.wires_output]
self.qlayer_output = qml.QNode(_circuit_output, self.dev_output, interface="torch")
weight_shapes = {"weights": (self.n_qlayers, self.n_vrotations, self.n_qubits)}
print(
f"weight_shapes = (n_qlayers, n_vrotations, n_qubits) = ({self.n_qlayers}, {self.n_vrotations}, {self.n_qubits})")
self.clayer_in = torch.nn.Linear(self.concat_size, self.n_qubits)
self.VQC = {
'forget': qml.qnn.TorchLayer(self.qlayer_forget, weight_shapes),
'input': qml.qnn.TorchLayer(self.qlayer_input, weight_shapes),
'update': qml.qnn.TorchLayer(self.qlayer_update, weight_shapes),
'output': qml.qnn.TorchLayer(self.qlayer_output, weight_shapes)
}
self.clayer_out = torch.nn.Linear(self.n_qubits, self.hidden_size)
# self.clayer_out = [torch.nn.Linear(n_qubits, self.hidden_size) for _ in range(4)]
def forward(self, x, init_states=None):
'''
x.shape is (batch_size, seq_length, feature_size)
recurrent_activation -> sigmoid
activation -> tanh
'''
if self.batch_first is True:
batch_size, seq_length, features_size = x.size()
else:
seq_length, batch_size, features_size = x.size()
hidden_seq = []
if init_states is None:
h_t = torch.zeros(batch_size, self.hidden_size) # hidden state (output)
c_t = torch.zeros(batch_size, self.hidden_size) # cell state
else:
# for now we ignore the fact that in PyTorch you can stack multiple RNNs
# so we take only the first elements of the init_states tuple init_states[0][0], init_states[1][0]
h_t, c_t = init_states
h_t = h_t[0]
c_t = c_t[0]
for t in range(seq_length):
# get features from the t-th element in seq, for all entries in the batch
x_t = x[:, t, :]
# Concatenate input and hidden state
v_t = torch.cat((h_t, x_t), dim=1)
# match qubit dimension
y_t = self.clayer_in(v_t)
f_t = torch.sigmoid(self.clayer_out(self.VQC['forget'](y_t))) # forget block
i_t = torch.sigmoid(self.clayer_out(self.VQC['input'](y_t))) # input block
g_t = torch.tanh(self.clayer_out(self.VQC['update'](y_t))) # update block
o_t = torch.sigmoid(self.clayer_out(self.VQC['output'](y_t))) # output block
c_t = (f_t * c_t) + (i_t * g_t)
h_t = o_t * torch.tanh(c_t)
hidden_seq.append(h_t.unsqueeze(0))
hidden_seq = torch.cat(hidden_seq, dim=0)
hidden_seq = hidden_seq.transpose(0, 1).contiguous()
return hidden_seq, (h_t, c_t)
class QShallowRegressionLSTM(nn.Module):
def __init__(self, num_sensors, hidden_units, n_qubits=0, n_qlayers=1):
super().__init__()
self.num_sensors = num_sensors # this is the number of features
self.hidden_units = hidden_units
self.num_layers = 1
# self.lstm = nn.LSTM(
# input_size=num_sensors,
# hidden_size=hidden_units,
# batch_first=True,
# num_layers=self.num_layers
# )
self.lstm = QLSTM(
input_size=num_sensors,
hidden_size=hidden_units,
batch_first=True,
n_qubits=n_qubits,
n_qlayers=n_qlayers
)
self.linear = nn.Linear(in_features=self.hidden_units, out_features=1)
def forward(self, x):
batch_size = x.shape[0]
h0 = torch.zeros(self.num_layers, batch_size, self.hidden_units).requires_grad_()
c0 = torch.zeros(self.num_layers, batch_size, self.hidden_units).requires_grad_()
_, (hn, _) = self.lstm(x, (h0, c0))
out = self.linear(hn).flatten() # First dim of Hn is num_layers, which is set to 1 above.
return out
Then I’m running additional code on a notebook. Here is the code.
def train_model(data_loader, model, loss_function, optimizer):
num_batches = len(data_loader)
total_loss = 0
model.train()
for X, y in data_loader:
output = model(X)
loss = loss_function(output, y)
optimizer.zero_grad()
loss.backward()
optimizer.step()
total_loss += loss.item()
avg_loss = total_loss / num_batches
print(f"Train loss: {avg_loss}")
return avg_loss
def test_model(data_loader, model, loss_function):
num_batches = len(data_loader)
total_loss = 0
model.eval()
with torch.no_grad():
for X, y in data_loader:
output = model(X)
total_loss += loss_function(output, y).item()
avg_loss = total_loss / num_batches
print(f"Test loss: {avg_loss}")
return avg_loss
def predict(data_loader, model):
"""Just like `test_loop` function but keep track of the outputs instead of the loss
function.
"""
output = torch.tensor([])
model.eval()
with torch.no_grad():
for X, _ in data_loader:
y_star = model(X)
output = torch.cat((output, y_star), 0)
return output
from factory import QShallowRegressionLSTM
learning_rate = 0.05
num_hidden_units = 16
Qmodel = QShallowRegressionLSTM(num_sensors=len(features), hidden_units=num_hidden_units, n_qubits=4)
loss_function = nn.MSELoss()
optimizer = torch.optim.Adagrad(Qmodel.parameters(), lr=learning_rate)
quantum_loss_train = []
quantum_loss_test = []
print("Untrained test\n--------")
start = time.time()
test_loss = test_model(test_loader, Qmodel, loss_function)
end = time.time()
print("Execution time", end - start)
quantum_loss_test.append(test_loss)
for ix_epoch in range(20):
print(f"Epoch {ix_epoch}\n---------")
start = time.time()
train_loss = train_model(train_loader, Qmodel, loss_function, optimizer=optimizer)
test_loss = test_model(test_loader, Qmodel, loss_function)
end = time.time()
print("Execution time", end - start)
quantum_loss_train.append(train_loss)
quantum_loss_test.append(test_loss)
Here is the full error message, down below.
--------
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
<ipython-input-16-966b8482e935> in <cell line: 14>()
12 print("Untrained test\n--------")
13 start = time.time()
---> 14 test_loss = test_model(test_loader, Qmodel, loss_function)
15 end = time.time()
16 print("Execution time", end - start)
12 frames
<ipython-input-14-36c020aec645> in test_model(data_loader, model, loss_function)
26 with torch.no_grad():
27 for X, y in data_loader:
---> 28 output = model(X)
29 total_loss += loss_function(output, y).item()
30
/usr/local/lib/python3.10/dist-packages/torch/nn/modules/module.py in _call_impl(self, *args, **kwargs)
1499 or _global_backward_pre_hooks or _global_backward_hooks
1500 or _global_forward_hooks or _global_forward_pre_hooks):
-> 1501 return forward_call(*args, **kwargs)
1502 # Do not call functions when jit is used
1503 full_backward_hooks, non_full_backward_hooks = [], []
/content/factory.py in forward(self, x)
241 c0 = torch.zeros(self.num_layers, batch_size, self.hidden_units).requires_grad_()
242
--> 243 _, (hn, _) = self.lstm(x, (h0, c0))
244 out = self.linear(hn).flatten() # First dim of Hn is num_layers, which is set to 1 above.
245
/usr/local/lib/python3.10/dist-packages/torch/nn/modules/module.py in _call_impl(self, *args, **kwargs)
1499 or _global_backward_pre_hooks or _global_backward_hooks
1500 or _global_forward_hooks or _global_forward_pre_hooks):
-> 1501 return forward_call(*args, **kwargs)
1502 # Do not call functions when jit is used
1503 full_backward_hooks, non_full_backward_hooks = [], []
/content/factory.py in forward(self, x, init_states)
198 y_t = self.clayer_in(v_t)
199
--> 200 f_t = torch.sigmoid(self.clayer_out(self.VQC['forget'](y_t))) # forget block
201 i_t = torch.sigmoid(self.clayer_out(self.VQC['input'](y_t))) # input block
202 g_t = torch.tanh(self.clayer_out(self.VQC['update'](y_t))) # update block
/usr/local/lib/python3.10/dist-packages/torch/nn/modules/module.py in _call_impl(self, *args, **kwargs)
1499 or _global_backward_pre_hooks or _global_backward_hooks
1500 or _global_forward_hooks or _global_forward_pre_hooks):
-> 1501 return forward_call(*args, **kwargs)
1502 # Do not call functions when jit is used
1503 full_backward_hooks, non_full_backward_hooks = [], []
/usr/local/lib/python3.10/dist-packages/pennylane/qnn/torch.py in forward(self, inputs)
406 else:
407 # calculate the forward pass as usual
--> 408 results = self._evaluate_qnode(inputs)
409
410 # reshape to the correct number of batch dims
/usr/local/lib/python3.10/dist-packages/pennylane/qnn/torch.py in _evaluate_qnode(self, x)
427 **{arg: weight.to(x) for arg, weight in self.qnode_weights.items()},
428 }
--> 429 res = self.qnode(**kwargs)
430
431 if isinstance(res, torch.Tensor):
/usr/local/lib/python3.10/dist-packages/pennylane/qnode.py in __call__(self, *args, **kwargs)
934
935 # construct the tape
--> 936 self.construct(args, kwargs)
937
938 cache = self.execute_kwargs.get("cache", False)
/usr/local/lib/python3.10/dist-packages/pennylane/qnode.py in construct(self, args, kwargs)
825 self.interface = qml.math.get_interface(*args, *list(kwargs.values()))
826
--> 827 self._tape = make_qscript(self.func, shots)(*args, **kwargs)
828 self._qfunc_output = self.tape._qfunc_output
829
/usr/local/lib/python3.10/dist-packages/pennylane/tape/qscript.py in wrapper(*args, **kwargs)
1480 def wrapper(*args, **kwargs):
1481 with AnnotatedQueue() as q:
-> 1482 result = fn(*args, **kwargs)
1483
1484 qscript = QuantumScript.from_queue(q, shots)
/content/factory.py in _circuit_forget(inputs, weights)
129
130 def _circuit_forget(inputs, weights):
--> 131 VQC(inputs, weights, self.wires_forget)
132 return [qml.expval(qml.PauliZ(wires=i)) for i in self.wires_forget]
133
/content/factory.py in VQC(features, weights, wires_type)
122 for i in range(self.n_qubits):
123 qml.Hadamard(wires=wires_type[i])
--> 124 qml.RY(ry_params[i], wires=wires_type[i])
125 qml.RZ(ry_params[i], wires=wires_type[i])
126
IndexError: list index out of range
I’m using all of the most recent packages. Thank you in advance for your help.
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