def test_decoding_results():
viterbi_net_performance = []
threshold_performance = []
classic_performance = []
SNRs = np.linspace(.1, 10, 10)
seed_generator = 0
data_gen = None
for SNR in SNRs:
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
number_symbols = 500
channel = np.zeros((1, 4))
channel[0, [0, 1, 2, 3]] = 1, 0.1, 0.1, 0.2
data_gen = training_data_generator(
symbol_stream_shape=(1, number_symbols),
SNR=SNR,
plot=True,
channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
"""
Load in Trained Neural Network and verify that it is acceptable performance
"""
device = torch.device("cpu")
num_inputs_for_nn = 1
x, y = data_gen.get_labeled_data(inputs=num_inputs_for_nn)
y = np.argmax(
y, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, np.power(
m, channel_length)
net = models.ViterbiNet(D_in, H1, H2, D_out)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
"""
Train NN
"""
# criterion = nn.CrossEntropyLoss()
criterion = nn.NLLLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
for t in range(500):
output = net(x_train)
loss = criterion(output, y_train.long())
train_cost_over_epoch.append(loss)
net.zero_grad()
print(loss)
loss.backward()
optimizer.step()
test_cost_over_epoch.append(criterion(net(x_test), y_test.long()))
# Test NN
x, y = data_gen.get_labeled_data(inputs=num_inputs_for_nn)
y = np.argmax(
y, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
# criterion = nn.NLLLoss()
criterion = nn.CrossEntropyLoss()
cost = criterion(net(x), y.long())
threshold = 1e-2
# assert cost < threshold
"""
Train Mixture Model
"""
mixture_model_training_data = data_gen.channel_output.flatten()
num_sources = pow(data_gen.alphabet.size, data_gen.CIR_matrix.shape[1])
mm = em_gausian(num_sources,
mixture_model_training_data,
20,
save=True,
model=True)
mm = mm.get_probability
# mm = 1
"""
After sending through channel, symbol detection should be performed using something like a matched filter.
Create new set of test data.
"""
data_gen = training_data_generator(
symbol_stream_shape=(1, number_symbols),
SNR=SNR,
plot=True,
channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
# !! Make sure channel output gets flipped here!!
metric = NeuralNetworkMixtureModelMetric(
net, mm, data_gen.channel_output, input_length=num_inputs_for_nn
) # This is a function to be used in the viterbi
detected_nn = viterbi_setup_with_nodes(data_gen.alphabet,
data_gen.channel_output,
data_gen.CIR_matrix.shape[1],
metric.metric)
ser_nn = symbol_error_rate_channel_compensated(
detected_nn, data_gen.symbol_stream_matrix, channel_length)
"""
Compare to Classical Viterbi with full CSI
"""
metric = GaussianChannelMetric(
channel, data_gen.channel_output
) # This is a function to be used in the viterbi
detected_classic = viterbi_setup_with_nodes(
data_gen.alphabet, data_gen.channel_output,
data_gen.CIR_matrix.shape[1], metric.metric)
ser_classic = symbol_error_rate_channel_compensated(
detected_classic, data_gen.symbol_stream_matrix, channel_length)
"""
Analyze SER performance
"""
viterbi_net_performance.append(ser_nn)
classic_performance.append(ser_classic)
path = "Output/SER.pickle"
pickle_out = open(path, "wb")
pickle.dump([classic_performance, viterbi_net_performance], pickle_out)
pickle_out.close()
plt.figure(1)
plt.plot(SNRs, viterbi_net_performance, label='viterbi net')
plt.plot(SNRs, classic_performance, label='standard viterbi')
plt.title(str(data_gen.get_info_for_plot()), fontdict={'fontsize': 10})
plt.xlabel("SNR")
plt.ylabel("SER")
plt.legend(loc='upper left')
path = "Output/SER_curves.png"
plt.savefig(path, format="png")
time_path = "Output/SER_" + net.name + str(num_inputs_for_nn) + str(
number_symbols) + " symbols " + str(time.time()) + "curves.png"
plt.savefig(time_path, format="png")
assert True
def test_full_integration():
viterbi_net_performance = []
linear_mmse_performance = []
classic_performance = []
SNRs_dB = np.linspace(20, 20, 2)
# SNRs_dB = np.linspace(6, 10,3)
SNRs = np.power(10, SNRs_dB/10)
seed_generator = 0
data_gen = None
channel = None
number_symbols = 5000
channel = np.zeros((1, 5))
# channel[0, [0, 1, 2, 3, 4]] = 0.227, 0.460, 0.688, 0.460, 0.227
channel[0, [0, 1, 2, 3, 4]] = 0.9, 0.7, 0.3, 0.5, 0.1
# Method used in ViterbiNet Paper
# channel[0, :] = np.random.randn(channel.size)
# channel = np.zeros((1, 5))
# channel[0, [0, 1, 2, 3, 4]] = 1, 0, .2, .2, .4
# channel[0, [0, 1, 2, 3]] = .8, 0, .02, .4
# channel[0, [0, 1, 2, 3, 4]] = 1, .7, .3, .1, .4
# channel[0, [0, 1, 2, 3, 4]] = 1, .4, .7, .1, .3
# channel = np.zeros((1, 3))
# channel[0, [0]] = 1
for SNR in SNRs:
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
data_gen = CommunicationDataGenerator(symbol_stream_shape=(1, number_symbols), SNR=SNR, plot=True, channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
# plt.scatter(data_gen.channel_output.flatten(),data_gen.channel_output.flatten())
# plt.show()
"""
Load in Trained Neural Network and verify that it is acceptable performance
"""
device = torch.device("cpu")
x, y = data_gen.get_labeled_data()
y = np.argmax(y, axis=1) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
# channel_length = channel_length-2
output_layer_size = np.power(m, channel_length)
num_states = output_layer_size
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, output_layer_size
net = models.ViterbiNet(D_in, H1, H2, D_out)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
"""
Train NN
"""
# This loss function looks at only the true class and takes the NLL of that.
criterion = nn.NLLLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
batch_size = 1000
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
epochs = 900
for t in range(epochs):
batch_indices = np.random.randint(len(y_train), size=(1, batch_size))
x_batch = x_train[(batch_indices)]
y_batch = y_train[(batch_indices)]
# Add "dropout to prevent overfitting data"
net.zero_grad()
output = net(x_batch)
loss = criterion(output, y_batch.long())
loss.backward()
optimizer.step()
test_batch_indices = np.random.randint(len(y_test), size=(1, batch_size))
x_batch_test = x_test[(test_batch_indices)]
y_batch_test = y_test[(test_batch_indices)]
# Setup Accuracy test
# detached_ouput = output.
max_state_train = np.argmax(output.detach().numpy(), axis=1)
max_state_test = np.argmax(net(x_batch_test).detach().numpy(), axis=1)
train_cost_over_epoch.append(np.sum(np.not_equal(max_state_train, y_batch.detach().numpy()))/y_batch.size())
test_cost_over_epoch.append(np.sum(np.not_equal(max_state_test, y_batch_test.detach().numpy()))/y_batch_test.size())
# test_cost_over_epoch.append(criterion(net(x_batch_test), y_batch_test.long()))
"""
Train Mixture Model
"""
mm_train_size = 1000
mixture_model_training_data = data_gen.channel_output.flatten()[0:mm_train_size]
num_sources = num_states
mm = em_gausian(num_sources, mixture_model_training_data, 10, save=True, model=True)
mm = mm.get_probability
"""
User training data to train MMSE equalizer to then use on the test data
"""
mmse_equalizer = LinearMMSE()
mmse_equalizer.train_equalizer(data_gen.symbol_stream_matrix, data_gen.channel_output, data_gen.symbol_stream_matrix, channel.size)
"""
Create new set of test data.
"""
ser_nn = []
ser_classic = []
ser_lmmse = []
for reps in range(5):
del data_gen
data_gen = CommunicationDataGenerator(symbol_stream_shape=(1, 2000), SNR=SNR, plot=True, channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
"""
Evaluate Neural Net Performance
"""
# metric = NeuralNetworkMixtureModelMetric(net, mm, data_gen.channel_output)
metric = NeuralNetworkMixtureModelMetric(net, mm, np.flip(data_gen.channel_output))
detected_nn = viterbi_setup_with_nodes(data_gen.alphabet, data_gen.channel_output, data_gen.CIR_matrix.shape[1],
metric.metric)
ser_nn = symbol_error_rate_channel_compensated_NN(detected_nn, data_gen.symbol_stream_matrix, channel_length)
"""
Compare to Classical Viterbi with full CSI
"""
metric = GaussianChannelMetric(channel, np.flip(data_gen.channel_output)) # This is a function to be used in the viterbi
detected_classic = viterbi_setup_with_nodes(data_gen.alphabet, data_gen.channel_output, data_gen.CIR_matrix.shape[1],
metric.metric)
ser_classic = symbol_error_rate(detected_classic, data_gen.symbol_stream_matrix, channel_length)
"""
Evaluate performance with linear MMSE
"""
ser_lmmse.append(mmse_equalizer.test_equalizer(data_gen.symbol_stream_matrix, data_gen.channel_output))
ser_nn = np.average(ser_nn)
ser_classic = np.average(ser_classic)
ser_lmmse = np.average(ser_lmmse)
"""
Analyze SER performance
"""
linear_mmse_performance.append(ser_lmmse)
viterbi_net_performance.append(ser_nn)
classic_performance.append(ser_classic)
path = "Output/SER.pickle"
pickle_out = open(path, "wb")
pickle.dump([classic_performance, linear_mmse_performance, viterbi_net_performance], pickle_out)
pickle_out.close()
figure, dictionary = plot_symbol_error_rates(SNRs_dB, [classic_performance, linear_mmse_performance, viterbi_net_performance], data_gen.get_info_for_plot())
time_path = "Output/SER_"+f"{time.time()}"+"curves.png"
figure.savefig(time_path, format="png")
text_path = "Output/SER_"+f"{time.time()}"+"curves.csv"
pd.DataFrame.from_dict(dictionary).to_csv(text_path)
figure.savefig(time_path, format="png")
#Plots for NN training information
plt.figure(2)
plt.plot(test_cost_over_epoch, label='Test Error')
plt.plot(train_cost_over_epoch, label='Train Error')
plt.title(str(data_gen.get_info_for_plot()), fontdict={'fontsize': 10})
plt.xlabel("Epoch")
plt.ylabel("Error")
plt.legend(loc='upper right')
path = f"Output/Neural_Network{time.time()}_Convergence.png"
plt.savefig(path, format="png")
def test_nn_channel_reduced():
viterbi_net_performance = []
linear_mmse_performance = []
classic_performance = []
SNRs_dB = np.linspace(15, 15, 1)
# SNRs_dB = np.linspace(6, 10,3)
SNRs = np.power(10, SNRs_dB / 10)
seed_generator = 0
data_gen = None
channel = None
number_symbols = 5000
channel = np.zeros((1, 5))
# channel[0, [0, 1, 2, 3, 4]] = 0.227, 0.460, 0.688, 0.460, 0.227
# Method used in ViterbiNet Paper
channel[0, :] = np.random.randn(channel.size)
# channel = np.zeros((1, 5))
# channel[0, [0, 1, 2, 3, 4]] = 1, 0, .2, .2, .4
# channel[0, [0, 1, 2, 3]] = .8, 0, .02, .4
# channel[0, [0, 1, 2, 3, 4]] = 1, .7, .3, .1, .4
# channel[0, [0, 1, 2, 3, 4]] = 1, .4, .7, .1, .3
# channel = np.zeros((1, 3))
# channel[0, [0]] = 1
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
data_gen = training_data_generator(symbol_stream_shape=(1, number_symbols),
SNR=SNRs,
plot=True,
channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
# plt.scatter(data_gen.channel_output.flatten(),data_gen.channel_output.flatten())
# plt.show()
"""
Load in Trained Neural Network and verify that it is acceptable performance
"""
device = torch.device("cpu")
reduced_state = 32
x, y = data_gen.get_labeled_data_reduced_state(reduced_state)
# x, y = data_gen.get_labeled_data()
y = np.argmax(
y, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
output_layer_size = np.power(m, channel_length)
output_layer_size = reduced_state
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, output_layer_size
# N, D_in, H1, H2, H3, D_out = number_symbols, 1, 20, 20, 20, output_layer_size
net = models.ViterbiNet(D_in, H1, H2, D_out)
# net = models.viterbiNet(D_in, H1, H2, D_out, dropout_probability)
# net = models.deeper_viterbiNet(D_in, H1, H2, H3, D_out, dropout_probability)
# N, D_in, H1, H2, H3, D_out = number_symbols, num_inputs_for_nn, 20, 10, 10, np.power(m, channel_length)
# net = models.deeper_viterbiNet(D_in, H1, H2, H3, D_out)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
# optimizer = optim.SGD(net.parameters(), lr=1e-1)
"""
Train NN
"""
# This loss function looks at only the true class and takes the NLL of that.
criterion = nn.NLLLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
batch_size = 1000
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
epochs = 900
for t in range(epochs):
batch_indices = np.random.randint(len(y_train), size=(1, batch_size))
x_batch = x_train[(batch_indices)]
y_batch = y_train[(batch_indices)]
# Add "dropout to prevent overfitting data"
net.zero_grad()
output = net(x_batch)
loss = criterion(output, y_batch.long())
loss.backward()
optimizer.step()
test_batch_indices = np.random.randint(len(y_test),
size=(1, batch_size))
x_batch_test = x_test[(test_batch_indices)]
y_batch_test = y_test[(test_batch_indices)]
# Setup Accuracy test
# detached_ouput = output.
max_state_train = np.argmax(output.detach().numpy(), axis=1)
check = np.not_equal(max_state_train, y_batch.detach().numpy())
max_state_test = np.argmax(net(x_batch_test).detach().numpy(), axis=1)
train_cost_over_epoch.append(
np.sum(np.not_equal(max_state_train,
y_batch.detach().numpy())) / y_batch.size())
test_cost_over_epoch.append(
np.sum(np.not_equal(max_state_test,
y_batch_test.detach().numpy())) /
y_batch_test.size())
# test_cost_over_epoch.append(criterion(net(x_batch_test), y_batch_test.long()))
#Plots for NN training information
plt.figure(2)
plt.plot(test_cost_over_epoch, label='Test Error')
plt.plot(train_cost_over_epoch, label='Train Error')
plt.title(str(data_gen.get_info_for_plot()), fontdict={'fontsize': 10})
plt.xlabel("Epoch")
plt.ylabel("Error")
plt.legend(loc='upper right')
path = f"Output/Neural_Network{time.time()}_Convergence.png"
plt.savefig(path, format="png")
def test_auto_encoder():
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
number_symbols = 5000
sources = 32
x = np.random.randint(sources, size=(number_symbols, 1))
y = x.flatten()
x = x + np.random.standard_normal((number_symbols, 1)) * 1
# plt.scatter(x, x)
# plt.show()
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size]
x_test = x[train_size::]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, sources
net = models.ViterbiNet(D_in, H1, H2, D_out)
# N, D_in, H1, H2, H3, D_out = number_symbols, 1, 50, 50, 50, sources
# net = models.deeper_viterbiNet(D_in, H1, H2, H3, D_out, dropout_probability)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
# optimizer = optim.SGD(net.parameters(), lr=1e-1)
"""
Train NN
"""
criterion = nn.NLLLoss()
# criterion = nn.CrossEntropyLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
accuracy = []
batch_size = 1000
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
for t in range(900):
batch_indices = np.random.randint(len(y_train), size=(1, batch_size))
x_batch = x_train[(batch_indices)]
y_batch = y_train[(batch_indices)]
output = net(x_batch)
loss = criterion(output, y_batch.long())
train_cost_over_epoch.append(loss)
net.zero_grad()
# print(loss)
loss.backward()
optimizer.step()
test_batch_indices = np.random.randint(len(y_test),
size=(1, batch_size))
x_batch_test = x_test[(test_batch_indices)]
y_batch_test = y_test[(test_batch_indices)]
# check = np.argmax(net(x_batch_test))
# accuracy.append(np.sum(np.equal(net(x_batch_test), y_batch_test)))
test_cost_over_epoch.append(
criterion(net(x_batch_test), y_batch_test.long()))
x = np.random.randint(sources, size=(100000, 1))
y = x.flatten()
x = torch.Tensor(x)
check = net(x).detach().numpy()
output = np.argmax(net(x).detach().numpy(), axis=1)
test = np.not_equal(y, output)
error = np.sum(np.not_equal(y, output))
print(f"number of errors: {error/100000}")
#Plots for NN training information
# plt.figure(1)
# plt.plot(accuracy, label='Test Error')
plt.figure(2)
plt.plot(test_cost_over_epoch, label='Test Error')
plt.plot(train_cost_over_epoch, label='Train Error')
plt.xlabel("Epoch")
plt.ylabel("Error")
plt.legend(loc='upper left')
plt.show()
assert True
def test_reduced_full_final():
viterbi_net_performance = []
viterbi_net_reduced_performance = []
linear_mmse_performance = []
classic_performance = []
SNRs_dB = np.linspace(0, 15, 15)
SNRs = np.power(10, SNRs_dB / 10)
seed_generator = 0
data_gen = None
channel = None
quantization_level = None
quantization_level = 0
noise_levels = None
# noise_levels = 2
number_symbols = 5000
channel = np.zeros((1, 5))
# channel[0, [0, 1, 2, 3, 4]] = 0.227, 0.460, 0.688, 0.460, 0.227
# channel[0, [0, 1, 2, 3, 4]] = 0.9, 0.7, 0.3, 0.5, 0.1
# Channel to use for redundancy testing
# Method used in ViterbiNet Paper
# channel[0, :] = np.random.randn(channel.size)
# channel = np.zeros((1, 5))
channel[0, [0, 1, 2, 3, 4]] = .9, 0, .0, .4, .7
# channel = np.zeros((1, 3))
# channel[0, [0, 1, 2]] = .9, .8, .7
# channel = np.zeros((1, 3))
# channel[0, [0]] = 1
for SNR in SNRs:
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
data_gen = CommunicationDataGenerator(
symbol_stream_shape=(1, number_symbols),
SNR=SNR,
plot=True,
channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel(quantization_level,
noise_levels=noise_levels)
# plt.scatter(data_gen.channel_output.flatten(),data_gen.channel_output.flatten())
# plt.show()
"""
Setup Reduced ViterbiNet training data.
"""
reduced_state = 8
x_reduced, y_reduced, states_reduced, states_original, totals = data_gen.get_labeled_data_reduced_state(
reduced_state)
y_reduced = np.argmax(
y_reduced, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x_reduced = torch.Tensor(x_reduced)
y_reduced = torch.Tensor(y_reduced)
train_size = int(.6 * number_symbols)
x_train_reduced = x_reduced[0:train_size, :]
x_test_reduced = x_reduced[train_size::, :]
y_train_reduced = y_reduced[0:train_size]
y_test_reduced = y_reduced[train_size::]
"""
Setup Standard ViterbiNet training data.
"""
x, y = data_gen.get_labeled_data()
y = np.argmax(
y, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup reduced NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
output_layer_size = reduced_state
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, output_layer_size
net_reduced = models.ViterbiNet(D_in, H1, H2, D_out)
optimizer_reduced = optim.Adam(net_reduced.parameters(), lr=1e-2)
criterion_reduced = nn.NLLLoss()
batch_size = 1000
train_cost_over_epoch_reduced = []
test_cost_over_epoch_reduced = []
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
epochs = 50
for t in range(epochs):
batch_indices = np.random.randint(len(y_train),
size=(1, batch_size))
x_batch_reduced = x_train_reduced[(batch_indices)]
y_batch_reduced = y_train_reduced[(batch_indices)]
# Add "dropout to prevent overfitting data"
net_reduced.zero_grad()
output_reduced = net_reduced(x_batch_reduced)
loss_reduced = criterion_reduced(output_reduced,
y_batch_reduced.long())
loss_reduced.backward()
optimizer_reduced.step()
test_batch_indices = np.random.randint(len(y_test),
size=(1, batch_size))
x_batch_test_reduced = x_test_reduced[(test_batch_indices)]
y_batch_test_reduced = y_test_reduced[(test_batch_indices)]
# Setup Accuracy test
max_state_train_reduced = np.argmax(
output_reduced.detach().numpy(), axis=1)
max_state_test_reduced = np.argmax(
net_reduced(x_batch_test_reduced).detach().numpy(), axis=1)
train_cost_over_epoch_reduced.append(
np.sum(
np.not_equal(max_state_train_reduced,
y_batch_reduced.detach().numpy())) /
y_batch_reduced.size())
test_cost_over_epoch_reduced.append(
np.sum(
np.not_equal(max_state_test_reduced,
y_batch_test_reduced.detach().numpy())) /
y_batch_test_reduced.size())
"""
Setup standard NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
# channel_length = channel_length-2
output_layer_size = np.power(m, channel_length)
num_states = output_layer_size
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, output_layer_size
net = models.ViterbiNet(D_in, H1, H2, D_out)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
"""
Train NN
"""
# This loss function looks at only the true class and takes the NLL of that.
criterion = nn.NLLLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
epochs = 500
for t in range(epochs):
batch_indices = np.random.randint(len(y_train),
size=(1, batch_size))
x_batch = x_train[(batch_indices)]
y_batch = y_train[(batch_indices)]
# Add "dropout to prevent overfitting data"
net.zero_grad()
net_reduced.zero_grad()
output = net(x_batch)
loss = criterion(output, y_batch.long())
loss.backward()
optimizer.step()
test_batch_indices = np.random.randint(len(y_test),
size=(1, batch_size))
x_batch_test = x_test[(test_batch_indices)]
y_batch_test = y_test[(test_batch_indices)]
# Setup Accuracy test
max_state_train = np.argmax(output.detach().numpy(), axis=1)
max_state_test = np.argmax(net(x_batch_test).detach().numpy(),
axis=1)
train_cost_over_epoch.append(
np.sum(np.not_equal(max_state_train,
y_batch.detach().numpy())) /
y_batch.size())
test_cost_over_epoch.append(
np.sum(
np.not_equal(max_state_test,
y_batch_test.detach().numpy())) /
y_batch_test.size())
"""
Train Mixture Model
"""
mixture_model_training_data = data_gen.channel_output.flatten(
)[0:train_size]
num_sources = reduced_state
mm = em_gausian(num_sources,
mixture_model_training_data,
10,
save=True,
model=True)
mm = mm.get_probability
"""
Train Reduced Mixture Model
"""
mixture_model_training_data_reduced = data_gen.channel_output.flatten(
)[0:train_size]
num_sources = reduced_state
mm_reduced = em_gausian(num_sources,
mixture_model_training_data_reduced,
10,
save=True,
model=True)
mm_reduced = mm_reduced.get_probability
"""
User training data to train MMSE equalizer to then use on the test data
"""
mmse_equalizer = LinearMMSE()
mmse_equalizer.train_equalizer(data_gen.symbol_stream_matrix,
data_gen.channel_output,
data_gen.symbol_stream_matrix,
channel.size)
"""
Create new set of test data.
"""
ser_nn = []
ser_nn_reduced = []
ser_classic = []
ser_lmmse = []
for reps in range(1):
del data_gen
data_gen = CommunicationDataGenerator(symbol_stream_shape=(1,
10000),
SNR=SNR,
plot=True,
channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel(quantization_level,
noise_levels=noise_levels)
"""
Evaluate Reduced Neural Net Performance
"""
metric = NeuralNetworkMixtureModelMetric(
net_reduced, mm_reduced, np.flip(data_gen.channel_output))
detected_nn = viterbi_setup_with_nodes(
data_gen.alphabet,
data_gen.channel_output,
data_gen.CIR_matrix.shape[1],
metric.metric,
reduced_length=reduced_state,
reduced=True)
symbol_probabilities = get_symbol_probabilities(
totals, states_original, data_gen.alphabet)
survivor_state_path = get_symbols_from_probabilities(
detected_nn, symbol_probabilities, data_gen.alphabet)
ser_nn_reduced = symbol_error_rate_channel_compensated_NN_reduced(
survivor_state_path, data_gen.symbol_stream_matrix,
channel_length)
"""
Evaluate Neural Net Performance
"""
metric = NeuralNetworkMixtureModelMetric(
net, mm, np.flip(data_gen.channel_output))
detected_nn = viterbi_setup_with_nodes(
data_gen.alphabet, data_gen.channel_output,
data_gen.CIR_matrix.shape[1], metric.metric)
ser_nn = symbol_error_rate_channel_compensated_NN(
detected_nn, data_gen.symbol_stream_matrix, channel_length)
"""
Compare to Classical Viterbi with full CSI
"""
metric = GaussianChannelMetric(
channel, np.flip(data_gen.channel_output), quantization_level
) # This is a function to be used in the viterbi
detected_classic = viterbi_setup_with_nodes(
data_gen.alphabet, data_gen.channel_output,
data_gen.CIR_matrix.shape[1], metric.metric)
ser_classic = symbol_error_rate(detected_classic,
data_gen.symbol_stream_matrix,
channel_length)
"""
Evaluate LMMSE
"""
ser_lmmse.append(
mmse_equalizer.test_equalizer(data_gen.symbol_stream_matrix,
data_gen.channel_output))
ser_nn = np.average(ser_nn)
ser_nn_reduced = np.average(ser_nn_reduced)
ser_classic = np.average(ser_classic)
ser_lmmse = np.average(ser_lmmse)
"""
Analyze SER performance
"""
linear_mmse_performance.append(ser_lmmse)
viterbi_net_performance.append(ser_nn)
classic_performance.append(ser_classic)
viterbi_net_reduced_performance.append(ser_nn_reduced)
figure, dictionary = plot_quantized_symbol_error_rates_nn_compare(
SNRs_dB, [
classic_performance, linear_mmse_performance,
viterbi_net_performance, viterbi_net_reduced_performance
], data_gen.get_info_for_plot())
time_path = "Output/SER_" + f"{time.time()}" + "curves.png"
figure.savefig(time_path, format="png")
text_path = "Output/SER_" + f"{time.time()}" + "curves.csv"
pd.DataFrame.from_dict(dictionary).to_csv(text_path)
figure.savefig(time_path, format="png")
def test_nn_validation():
viterbi_net_performance = []
threshold_performance = []
classic_performance = []
SNRs_dB = 2
SNRs = np.power(10, SNRs_dB/10)
seed_generator = 0
data_gen = None
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
number_symbols = 2000
channel = np.zeros((1, 3))
channel[0, [0, 1, 2]] = 1, 0.1, 0.1
data_gen = training_data_generator(symbol_stream_shape=(1, number_symbols), SNR=SNRs, plot=True, channel=channel)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
"""
Load in Trained Neural Network and verify that it is acceptable performance
"""
device = torch.device("cpu")
num_inputs_for_nn = 1
x, y = data_gen.get_labeled_data(inputs=num_inputs_for_nn)
y = np.argmax(y, axis=1) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, np.power(m, channel_length)
net = models.ViterbiNet(D_in, H1, H2, D_out)
# N, D_in, H1, H2, H3, D_out = number_symbols, num_inputs_for_nn, 20, 10, 10, np.power(m, channel_length)
# net = models.deeper_viterbiNet(D_in, H1, H2, H3, D_out)
# optimizer = optim.Adam(net.parameters(), lr=1e-4)
optimizer = optim.SGD(net.parameters(), lr=1e-2)
"""
Train NN
"""
# criterion = nn.NLLLoss()
criterion = nn.CrossEntropyLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
batch_size = 500
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
for t in range(1000):
batch_indices = np.random.randint(len(y_train), size=(1, batch_size))
x_batch = x_train[(batch_indices)]
y_batch = y_train[(batch_indices)]
output = net(x_batch)
loss = criterion(output, y_batch.long())
train_cost_over_epoch.append(loss)
net.zero_grad()
print(loss)
loss.backward()
optimizer.step()
test_batch_indices = np.random.randint(len(y_test), size=(1, batch_size))
x_batch_test = x_test[(test_batch_indices)]
y_batch_test = y_test[(test_batch_indices)]
test_cost_over_epoch.append(criterion(net(x_batch_test), y_batch_test.long()))
#Plots for NN training information
plt.figure(2)
plt.plot(test_cost_over_epoch, label='Test Error')
plt.plot(train_cost_over_epoch, label='Train Error')
plt.title(str(data_gen.get_info_for_plot()), fontdict={'fontsize': 10})
plt.xlabel("Epoch")
plt.ylabel("Error")
plt.legend(loc='upper left')
plt.show()
assert True
def test_results_nerual_net():
"""
Train and save the neural network
:return:
"""
"""
Choose platform
"""
device = torch.device("cpu")
# device = torch.device('cuda') # Uncomment this to run on GPU
"""
Setup Training Data
"""
number_symbols = 5000
channel = np.zeros((1, 4))
channel[0, [0, 1, 2, 3]] = 1, 0.6, 0.3, 0.2
data_gen = training_data_generator(symbol_stream_shape=(1, number_symbols),
SNR=4,
plot=True,
channel=channel)
# data_gen.setup_channel(shape=None)
data_gen.random_symbol_stream()
data_gen.send_through_channel()
"""
After sending through channel, symbol detection should be performed using something like a matched filter
"""
num_inputs_for_training_data = 1
x, y = data_gen.get_labeled_data(inputs=num_inputs_for_training_data)
y = np.argmax(
y, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
m = data_gen.alphabet.size
channel_length = data_gen.CIR_matrix.shape[1]
# N is batch size; D_in is input dimension;
# H is hidden dimension; D_out is output dimension.
N, D_in, H1, H2, D_out = number_symbols, num_inputs_for_training_data, 100, 50, np.power(
m, channel_length)
net = models.ViterbiNet(D_in, H1, H2, D_out)
#TODO use better optimizer
optimizer = optim.SGD(net.parameters(), lr=1e-2)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
"""
Train NN
"""
criterion = nn.CrossEntropyLoss()
# criterion = nn.NLLLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
for t in range(400):
output = net(x_train)
loss = criterion(output, y_train.long())
train_cost_over_epoch.append(loss)
net.zero_grad()
print(loss)
loss.backward()
optimizer.step()
test_cost_over_epoch.append(criterion(net(x_test), y_test.long()))
path = "Output/nn.pt"
torch.save(net, path)
"""
Test NN
"""
plt.figure()
plt.plot(test_cost_over_epoch, label='Test Error')
plt.plot(train_cost_over_epoch, label='Train Error')
plt.title(str(data_gen.get_info_for_plot()), fontdict={'fontsize': 10})
plt.xlabel("Epoch")
plt.ylabel("Error")
plt.legend(loc='upper left')
path = "Output/Neural_Network_Convergence.png"
path = "Output/NN_ERROR" + str(number_symbols) + " symbols " \
+ str(num_inputs_for_training_data) + " inputs " + str(time.time())+"curves.png"
plt.savefig(path, format="png")
plt.show()
assert True
def test_nano_data_nerual_net():
viterbi_net_performance = []
"""
Generated Testing Data using the same channel as was used for training the mixture model and the nn
"""
# Load data from path
train_path = 'mc_data/5_cm_train.csv'
test_path = 'mc_data/5_cm_test.csv'
true_path = 'mc_data/input_string.csv'
# train_path = 'mc_data/20_cm_train.csv'
# test_path = 'mc_data/20_cm_test.csv'
test_input_sequence = 'mc_data/input_string.csv'
test_input_sequence = np.loadtxt(test_input_sequence, delimiter=",")
true_input_string = np.loadtxt(true_path, delimiter=",")
# For now just making a channel that represents some estimated memory length of the true channel
SNRs_dB = np.linspace(5, 5, 1)
# SNRs_dB = np.linspace(6, 10,3)
SNRs = np.power(10, SNRs_dB / 10)
channel = np.zeros((1, 8))
channel[0, [0]] = 1
train_time, train_measurement = load_file(train_path)
test_time, test_measurement = load_file(test_path)
# plt.plot(test_measurement)
# plt.show()
pulse_shape = get_pulse(train_time, train_measurement)
# Train with a random symbol stream generated from the training set pulse
number_symbols = 10000
data_gen = CommunicationDataGenerator(SNR=SNRs,
symbol_stream_shape=(1,
number_symbols),
constellation="onOffKey",
channel=channel)
data_gen.random_symbol_stream()
# 5 is true perdiod
symbol_period = 5
data_gen.modulate_sampled_pulse(pulse_shape, symbol_period)
data_gen.filter_sample_modulated_pulse(pulse_shape, symbol_period)
# Test for making sure alignment is correct
# ser = symbol_error_rate_mc_data(data_gen.symbol_stream_matrix.flatten(), data_gen.channel_output.flatten(), channel.size)
"""
Load in Trained Neural Network and verify that it is acceptable performance
"""
reduced_state = 4
# x, y, states_reduced, states_original, totals = data_gen.get_labeled_data_reduced_state(reduced_state)
x, y = data_gen.get_labeled_data()
y = np.argmax(
y, axis=1
) # Fix for how the pytorch Cross Entropy expects class labels to be shown
x = torch.Tensor(x)
y = torch.Tensor(y)
train_size = int(.6 * number_symbols)
x_train = x[0:train_size, :]
x_test = x[train_size::, :]
y_train = y[0:train_size]
y_test = y[train_size::]
"""
Setup NN and optimizer
"""
channel_length = data_gen.CIR_matrix.shape[1]
# test_length = channel_length-1
output_layer_size = reduced_state
output_layer_size = np.power(data_gen.alphabet.size, channel_length)
N, D_in, H1, H2, D_out = number_symbols, 1, 100, 50, output_layer_size
net = models.ViterbiNet(D_in, H1, H2, D_out)
optimizer = optim.Adam(net.parameters(), lr=1e-2)
"""
Train NN
"""
criterion = nn.NLLLoss()
# criterion = nn.CrossEntropyLoss()
train_cost_over_epoch = []
test_cost_over_epoch = []
batch_size = 1000
# If training is perfect, then NN should be able to perfectly predict the class to which a test set belongs and thus the loss (KL Divergence) should be zero
epochs = 900
for t in range(epochs):
batch_indices = np.random.randint(len(y_train), size=(1, batch_size))
x_batch = x_train[(batch_indices)]
y_batch = y_train[(batch_indices)]
# Add "dropout to prevent overfitting data"
output = net(x_batch)
loss = criterion(output, y_batch.long())
net.zero_grad()
loss.backward()
optimizer.step()
test_batch_indices = np.random.randint(len(y_test),
size=(1, batch_size))
x_batch_test = x_test[(test_batch_indices)]
y_batch_test = y_test[(test_batch_indices)]
max_state_train = np.argmax(output.detach().numpy(), axis=1)
max_state_test = np.argmax(net(x_batch_test).detach().numpy(), axis=1)
train_cost_over_epoch.append(
np.sum(np.not_equal(max_state_train,
y_batch.detach().numpy())) / y_batch.size())
test_cost_over_epoch.append(
np.sum(np.not_equal(max_state_test,
y_batch_test.detach().numpy())) /
y_batch_test.size())
"""
Train Mixture Model
"""
# num_sources = pow(data_gen.alphabet.size, data_gen.CIR_matrix.shape[1])
num_sources = reduced_state
mixture_model_training_data = data_gen.channel_output.flatten(
)[0:train_size]
mm = em_gausian(num_sources,
mixture_model_training_data,
10,
save=True,
model=True)
mm = mm.get_probability
"""
Create new set of test data.
"""
# For comparing generated data to the true test data
# del data_gen
# number_symbols = 2000
# data_gen = CommunicationDataGenerator(SNR=SNRs, symbol_stream_shape=(1, number_symbols), constellation="onOffKey", channel= channel)
# data_gen.random_symbol_stream()
# data_gen.modulate_sampled_pulse(pulse_shape, symbol_period)
# data_gen.filter_sample_modulated_pulse(pulse_shape, symbol_period)
# generated_output = data_gen.channel_output
del data_gen
data_gen = CommunicationDataGenerator(SNR=SNRs,
symbol_stream_shape=(1,
number_symbols),
constellation="onOffKey",
channel=channel)
data_gen.random_symbol_stream(true_input_string)
data_gen.provide_transmitted_matrix(test_measurement)
data_gen.filter_sample_modulated_pulse(pulse_shape, symbol_period)
# # plt.scatter(data_gen.channel_output, data_gen.channel_output)
# plt.scatter(generated_output, generated_output)
# plt.show()
"""
Use Test Data
"""
"""
Evaluate Neural Net Performance
"""
# metric = NeuralNetworkMixtureModelMetric(net, mm, data_gen.channel_output)
metric = NeuralNetworkMixtureModelMetric(net, mm,
np.flip(data_gen.channel_output))
# detected_nn = viterbi_setup_with_nodes(data_gen.alphabet, data_gen.channel_output, data_gen.CIR_matrix.shape[1],
# metric.metric, reduced_length=reduced_state, reduced=True)
detected_nn = viterbi_setup_with_nodes(data_gen.alphabet,
data_gen.channel_output,
data_gen.CIR_matrix.shape[1],
metric.metric)
# symbol_probabilities = get_symbol_probabilities(totals, states_original, data_gen.alphabet)
# detected_nn = get_symbols_from_probabilities(detected_nn, symbol_probabilities, data_gen.alphabet)
ser_nn = symbol_error_rate_mc_data(detected_nn,
data_gen.symbol_stream_matrix,
channel_length)
# ser_nn = symbol_error_rate_channel_compensated_NN(detected_nn, data_gen.symbol_stream_matrix, channel_length)
viterbi_net_performance.append(ser_nn)
print(viterbi_net_performance)
path = "Output/SER.pickle"
pickle_out = open(path, "wb")
pickle.dump([viterbi_net_performance], pickle_out)
pickle_out.close()
# figure, dictionary = plot_symbol_error_rates(SNRs_dB, [classic_performance, linear_mmse_performance, viterbi_net_performance], data_gen.get_info_for_plot())
# time_path = "Output/SER_"+f"{time.time()}"+"curves.png"
# figure.savefig(time_path, format="png")
# text_path = "Output/SER_"+f"{time.time()}"+"curves.csv"
# pd.DataFrame.from_dict(dictionary).to_csv(text_path)
# figure.savefig(time_path, format="png")
#
#Plots for NN training information
plt.figure(2)
plt.plot(test_cost_over_epoch, label='Test Error')
plt.plot(train_cost_over_epoch, label='Train Error')
plt.title(str(data_gen.get_info_for_plot()), fontdict={'fontsize': 10})
plt.xlabel("Epoch")
plt.ylabel("Error")
plt.legend(loc='upper right')
path = f"Output/Neural_Network{time.time()}_Convergence.png"
plt.savefig(path, format="png")
