def test_linear_gradient_match(self):
input = [[0.5, 1.], [-0.3, 1.2]]
label = [[0.6], [-0.9]]
torch_input = torch.tensor(input)
torch_label = torch.tensor(label)
model = nn.Linear(2, 1)
criterion = nn.MSELoss()
torch_output = model.forward(torch_input)
torch_loss = criterion.forward(torch_output, torch_label)
torch_loss.backward()
torch_grad = model.weight.grad.tolist()[0] + model.bias.grad.tolist()
# AZ part
az_net = TorchNet.from_pytorch(model, [1, 2])
az_criterion = TorchCriterion.from_pytorch(criterion, [1, 1], [1, 1])
az_input = np.array(input)
az_label = np.array(label)
az_output = az_net.forward(az_input)
az_loss_output = az_criterion.forward(az_output, az_label)
az_loss_backward = az_criterion.backward(az_output, az_label)
az_model_backward = az_net.backward(az_input, az_loss_backward)
az_grad = list(az_net.parameters().values())[0]['gradWeight']
assert np.allclose(torch_loss.tolist(), az_loss_output)
assert np.allclose(torch_grad, az_grad.tolist())
def test_cross_entrophy_match(self):
input = [[0.5, 1.], [-0.3, 1.2]]
label = [3, 6]
torch_input = torch.tensor(input)
torch_label = torch.tensor(label).long()
model = nn.Linear(2, 10)
criterion = nn.CrossEntropyLoss()
def lossFunc(input, target):
return criterion.forward(input, target.flatten().long())
torch_output = model.forward(torch_input)
torch_loss = criterion.forward(torch_output, torch_label)
torch_loss.backward()
torch_grad = model.weight.grad.flatten().tolist(
) + model.bias.grad.tolist()
# AZ part
az_net = TorchNet.from_pytorch(model, [1, 2])
az_criterion = TorchCriterion.from_pytorch(lossFunc, [1, 10], [1, 1])
az_input = np.array(input)
az_label = np.array(label)
az_output = az_net.forward(az_input)
az_loss_output = az_criterion.forward(az_output, az_label)
az_loss_backward = az_criterion.backward(az_output, az_label)
az_model_backward = az_net.backward(az_input, az_loss_backward)
az_grad = list(az_net.parameters().values())[0]['gradWeight']
assert np.allclose(torch_loss.tolist(), az_loss_output)
assert np.allclose(torch_grad, az_grad.tolist())
def test_torchnet_constructor(self):
class TwoInputModel(nn.Module):
def __init__(self):
super(TwoInputModel, self).__init__()
self.dense1 = nn.Linear(2, 2)
self.dense2 = nn.Linear(3, 1)
def forward(self, x1, x2):
x1 = self.dense1(x1)
x2 = self.dense2(x2)
return x1, x2
az_net = TorchNet.from_pytorch(TwoInputModel(),
sample_input=(torch.ones(2, 2),
torch.ones(2, 3)))
az_net = TorchNet.from_pytorch(TwoInputModel(), ([2, 2], [2, 3]))
def test_Lenet_gradient_match(self):
class LeNet(nn.Module):
def __init__(self):
super(LeNet, self).__init__()
self.conv1 = nn.Conv2d(1, 20, 5, 1)
self.conv2 = nn.Conv2d(20, 50, 5, 1)
self.fc1 = nn.Linear(4 * 4 * 50, 500)
self.fc2 = nn.Linear(500, 10)
def forward(self, x):
x = F.relu(self.conv1(x))
x = F.max_pool2d(x, 2, 2)
x = F.relu(self.conv2(x))
x = F.max_pool2d(x, 2, 2)
x = x.view(-1, 4 * 4 * 50)
x = F.relu(self.fc1(x))
x = self.fc2(x)
return F.log_softmax(x, dim=1)
input = np.random.rand(2, 1, 28, 28)
label = [7, 3]
torch_input = torch.tensor(input).float()
torch_label = torch.tensor(label).long()
torch_model = LeNet()
torch_criterion = nn.CrossEntropyLoss()
torch_output = torch_model.forward(torch_input)
torch_loss = torch_criterion.forward(torch_output, torch_label)
torch_loss.backward()
torch_grad = torch_model.conv1.weight.grad.flatten().tolist() + \
torch_model.conv1.bias.grad.flatten().tolist() + \
torch_model.conv2.weight.grad.flatten().tolist() + \
torch_model.conv2.bias.grad.flatten().tolist() + \
torch_model.fc1.weight.grad.flatten().tolist() + \
torch_model.fc1.bias.grad.flatten().tolist() + \
torch_model.fc2.weight.grad.flatten().tolist() + \
torch_model.fc2.bias.grad.flatten().tolist()
# AZ part
az_net = TorchNet.from_pytorch(torch_model, [1, 1, 28, 28])
def lossFunc(input, target):
return torch_criterion.forward(input, target.flatten().long())
az_criterion = TorchCriterion.from_pytorch(lossFunc, [1, 10], [1, 1])
az_input = np.array(input)
az_label = np.array(label)
az_output = az_net.forward(np.array(input))
az_loss_output = az_criterion.forward(az_output, az_label)
az_loss_backward = az_criterion.backward(az_output, az_label)
az_model_backward = az_net.backward(az_input, az_loss_backward)
az_grad = list(az_net.parameters().values())[0]['gradWeight']
assert np.allclose(torch_loss.tolist(), az_loss_output)
assert np.allclose(torch_grad, az_grad.tolist(), atol=1.e-5, rtol=1.e-3)
def test_model_save_load(self):
class SimpleTorchModel(nn.Module):
def __init__(self):
super(SimpleTorchModel, self).__init__()
self.dense1 = nn.Linear(2, 4)
self.dense2 = nn.Linear(4, 1)
def forward(self, x):
x = self.dense1(x)
x = torch.sigmoid(self.dense2(x))
return x
df = self.sqlContext.createDataFrame([(Vectors.dense([2.0, 1.0]), 1.0),
(Vectors.dense([1.0, 2.0]), 0.0),
(Vectors.dense([2.0, 1.0]), 1.0),
(Vectors.dense([1.0, 2.0]), 0.0)
], ["features", "label"])
torch_model = SimpleTorchModel()
torch_criterion = nn.MSELoss()
az_model = TorchNet.from_pytorch(torch_model, [1, 2])
az_criterion = TorchCriterion.from_pytorch(torch_criterion, [1, 1],
[1, 1])
estimator = NNEstimator(az_model, az_criterion) \
.setBatchSize(4) \
.setLearningRate(0.01) \
.setMaxEpoch(10)
nnModel = estimator.fit(df)
res = nnModel.transform(df)
try:
tmp_dir = tempfile.mkdtemp()
modelPath = os.path.join(tmp_dir, "model")
az_model.savePytorch(modelPath)
loaded = TorchNet(modelPath)
resDF = NNModel(loaded).setPredictionCol("loaded").transform(res)
assert resDF.filter("prediction==loaded").count() == resDF.count()
finally:
try:
shutil.rmtree(tmp_dir) # delete directory
except OSError as exc:
if exc.errno != errno.ENOENT: # ENOENT - no such file or directory
raise # re-raise exception
def test_model_train_with_multiple_input(self):
class TwoInputModel(nn.Module):
def __init__(self):
super(TwoInputModel, self).__init__()
self.dense1 = nn.Linear(2, 2)
self.dense2 = nn.Linear(2, 1)
def forward(self, x1, x2):
x1 = self.dense1(x1)
x2 = self.dense2(x2)
return x1, x2
input = [[0.5, 1.], [-0.3, 1.2]]
torch_input1 = torch.tensor(input, requires_grad=True)
torch_input2 = torch.tensor(input, requires_grad=True)
torch_label = (torch.ones(2, 2), torch.ones(2, 1))
model = TwoInputModel()
criterion = nn.MSELoss()
def lossFunc(input, label):
loss1 = criterion(input[0], label[0])
loss2 = criterion(input[1], label[1])
loss = loss1 + 0.4 * loss2
return loss
torch_output = model.forward(torch_input1, torch_input2)
torch_loss = lossFunc(torch_output, torch_label)
torch_loss.backward()
torch_grad = model.dense1.weight.grad.tolist()[0] + \
model.dense1.weight.grad.tolist()[1] + \
model.dense1.bias.grad.tolist() + \
model.dense2.weight.grad.tolist()[0] + \
model.dense2.bias.grad.tolist()
az_net = TorchNet.from_pytorch(model,
sample_input=(torch.ones(2, 2),
torch.ones(2, 2)))
az_criterion = TorchCriterion.from_pytorch(
loss=lossFunc,
sample_input=(torch.ones(2, 2), torch.ones(2, 1)),
sample_label=(torch.ones(2, 2), torch.ones(2, 1)))
az_input = [np.array(input), np.array(input)]
az_label = [np.ones([2, 2]), np.ones([2, 1])]
az_output = az_net.forward(az_input)
az_loss_output = az_criterion.forward(az_output, az_label)
az_loss_backward = az_criterion.backward(az_output, az_label)
az_model_backward = az_net.backward(az_input, az_loss_backward)
az_grad = list(az_net.parameters().values())[0]['gradWeight']
assert np.allclose(torch_loss.tolist(), az_loss_output)
assert np.allclose(torch_grad, az_grad.tolist())
assert np.allclose(az_model_backward[0], torch_input1.grad)
assert np.allclose(az_model_backward[1], torch_input2.grad)
def test_torch_net_predict_resnet(self):
model = torchvision.models.resnet18(pretrained=True).eval()
net = TorchNet.from_pytorch(model, [1, 3, 224, 224])
dummpy_input = torch.ones(1, 3, 224, 224)
result = net.predict(dummpy_input.numpy()).collect()
assert np.allclose(result[0][0:5].tolist(),
np.asarray(
[-0.03913354128599167, 0.11446280777454376, -1.7967549562454224,
-1.2342952489852905, -0.819004476070404]))
def test_conv2D_gradient_match(self):
class SimpleTorchModel(nn.Module):
def __init__(self):
super(SimpleTorchModel, self).__init__()
self.dense1 = nn.Linear(2, 48)
self.conv1 = nn.Conv2d(3, 2, 2)
self.dense2 = nn.Linear(2, 1)
def forward(self, x):
x = self.dense1(x)
x = x.view(-1, 3, 4, 4)
x = torch.relu(self.conv1(x))
x = F.max_pool2d(x, 2)
x = x.view(x.size(0), -1)
x = torch.sigmoid(self.dense2(x))
return x
input = [[1., -0.5], [0.5, -1.]]
label = [[1., -0.5]]
torch_input = torch.tensor(input)
torch_label = torch.tensor(label)
torch_model = SimpleTorchModel()
torch_criterion = nn.MSELoss()
torch_output = torch_model.forward(torch_input)
torch_loss = torch_criterion.forward(torch_output, torch_label)
torch_loss.backward()
torch_grad = torch_model.dense1.weight.grad.flatten().tolist() + \
torch_model.dense1.bias.grad.flatten().tolist() + \
torch_model.conv1.weight.grad.flatten().tolist() + \
torch_model.conv1.bias.grad.flatten().tolist() + \
torch_model.dense2.weight.grad.flatten().tolist() + \
torch_model.dense2.bias.grad.flatten().tolist()
# AZ part
az_net = TorchNet.from_pytorch(torch_model, [1, 2])
az_criterion = TorchCriterion.from_pytorch(
loss=torch_criterion.forward,
input_shape=[1, 1],
label_shape=[1, 1])
az_input = np.array(input)
az_label = np.array(label)
az_output = az_net.forward(np.array(input))
az_loss_output = az_criterion.forward(az_output, az_label)
az_loss_backward = az_criterion.backward(az_output, az_label)
az_model_backward = az_net.backward(az_input, az_loss_backward)
az_grad = list(az_net.parameters().values())[0]['gradWeight']
assert np.allclose(torch_loss.tolist(), az_loss_output)
assert np.allclose(torch_grad, az_grad.tolist())
def predict(img_path):
val_loader = torch.utils.data.DataLoader(
datasets.ImageFolder(img_path, transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
])),
batch_size=8, shuffle=False,
num_workers=1, pin_memory=True)
model = models.resnet18(pretrained=True).eval()
net = TorchNet.from_pytorch(model, [1, 3, 224, 224])
for inputs, labels in val_loader:
output = net.predict(inputs.numpy(), distributed=True).collect()
index = [o.argmax() for o in output]
print(index)
def test_model_inference_with_multiple_output(self):
class TwoOutputModel(nn.Module):
def __init__(self):
super(TwoOutputModel, self).__init__()
self.dense1 = nn.Linear(2, 1)
def forward(self, x):
x1 = self.dense1(x)
return x, x1
torch_model = TwoOutputModel()
az_net = TorchNet.from_pytorch(TwoOutputModel(), [1, 2])
az_input = np.array([[0.5, 1.], [-0.3, 1.2]])
az_output = az_net.forward(az_input)
assert (len(az_output) == 2)
assert (az_output[0].shape == (2, 2))
assert (az_output[1].shape == (2, 1))
def test_torch_net_predict_resnet(self):
try:
model = torchvision.models.resnet18(pretrained=True).eval()
except:
# try again to work around connection error
import time
import random
time.sleep(random.randint(0, 20))
model = torchvision.models.resnet18(pretrained=True).eval()
net = TorchNet.from_pytorch(model, [1, 3, 224, 224])
dummpy_input = torch.ones(1, 3, 224, 224)
result = net.predict(dummpy_input.numpy()).collect()
assert np.allclose(
result[0][0:5].tolist(),
np.asarray([
-0.03913354128599167, 0.11446280777454376, -1.7967549562454224,
-1.2342952489852905, -0.819004476070404
]))
return x
if __name__ == '__main__':
if len(sys.argv) != 2:
print(sys.argv)
print("Need parameters: <imagePath>")
exit(-1)
sparkConf = init_spark_conf().setAppName("resnet").setMaster("local[2]") \
.set('spark.driver.memory', '10g')
sc = init_nncontext(sparkConf)
spark = SparkSession.builder.config(conf=sparkConf).getOrCreate()
torchnet = TorchNet.from_pytorch(CatDogModel(), [4, 3, 224, 224])
def lossFunc(input, target):
return nn.CrossEntropyLoss().forward(input, target.flatten().long())
torchcriterion = TorchCriterion.from_pytorch(lossFunc, [1, 2], torch.LongTensor([1]))
# prepare training data as Spark DataFrame
image_path = sys.argv[1]
imageDF = NNImageReader.readImages(image_path, sc, resizeH=256, resizeW=256, image_codec=1)
getName = udf(lambda row: os.path.basename(row[0]), StringType())
getLabel = udf(lambda name: 1.0 if name.startswith('cat') else 0.0, DoubleType())
labelDF = imageDF.withColumn("name", getName(col("image"))) \
.withColumn("label", getLabel(col('name'))).cache()
(trainingDF, validationDF) = labelDF.randomSplit([0.9, 0.1])
sparkConf = init_spark_conf().setAppName("testNNClassifer").setMaster(
'local[1]')
sc = init_nncontext(sparkConf)
spark = SparkSession \
.builder \
.getOrCreate()
df = spark.createDataFrame([(Vectors.dense([2.0, 1.0]), 1.0),
(Vectors.dense([1.0, 2.0]), 0.0),
(Vectors.dense([2.0, 1.0]), 1.0),
(Vectors.dense([1.0, 2.0]), 0.0)],
["features", "label"])
torch_model = SimpleTorchModel()
torch_criterion = nn.MSELoss()
az_model = TorchNet.from_pytorch(torch_model, [1, 2])
az_criterion = TorchCriterion.from_pytorch(torch_criterion, [1, 1], [1, 1])
classifier = NNClassifier(az_model, az_criterion) \
.setBatchSize(4) \
.setOptimMethod(Adam()) \
.setLearningRate(0.01) \
.setMaxEpoch(10)
nnClassifierModel = classifier.fit(df)
print("After training: ")
res = nnClassifierModel.transform(df)
res.show(10, False)
def test_torchnet_constructor(self):
# two inputs test
class TwoInputModel(nn.Module):
def __init__(self):
super(TwoInputModel, self).__init__()
self.dense1 = nn.Linear(2, 2)
self.dense2 = nn.Linear(3, 1)
def forward(self, x1, x2):
x1 = self.dense1(x1)
x2 = self.dense2(x2)
return x1, x2
TorchNet.from_pytorch(TwoInputModel(),
(torch.ones(2, 2), torch.ones(2, 3)))
TorchNet.from_pytorch(TwoInputModel(), ([2, 2], [2, 3]))
TorchNet.from_pytorch(
TwoInputModel(),
[torch.ones(2, 2), torch.ones(2, 3)])
TorchNet.from_pytorch(TwoInputModel(), [[2, 2], [2, 3]])
# one input
input = [[0.5, 1.], [-0.3, 1.2]]
torch_input = torch.tensor(input)
model = nn.Linear(2, 1)
TorchNet.from_pytorch(model, torch_input)
TorchNet.from_pytorch(model, [1, 2])
def train(train_loader, model, criterion, optimizer, epoch, args):
num_executors = 2
num_cores_per_executor = 4
hadoop_conf_dir = os.environ.get('HADOOP_CONF_DIR')
sc = init_spark_on_yarn(
hadoop_conf=hadoop_conf_dir,
conda_name=os.
environ["ZOO_CONDA_NAME"], # The name of the created conda-env
num_executor=num_executors,
executor_cores=num_cores_per_executor,
executor_memory="20g",
driver_memory="10g",
driver_cores=1,
spark_conf={"spark.rpc.message.maxSize": "1024"})
model.train()
sgd = Adam()
zooModel = TorchNet.from_pytorch(model, [4, 3, 224, 224])
def lossFunc(input, target):
return nn.NLLLoss().forward(input, target.flatten().long())
zooCriterion = TorchCriterion.from_pytorch(lossFunc, [1, 2],
torch.LongTensor([1]))
# zooCriterion = SparseCategoricalCrossEntropy(zero_based_label=True)
estimator = Estimator(zooModel, optim_methods=sgd)
batch_time = AverageMeter('Time', ':6.3f')
data_time = AverageMeter('Data', ':6.3f')
losses = AverageMeter('Loss', ':.4e')
top1 = AverageMeter('Acc@1', ':6.2f')
top5 = AverageMeter('Acc@5', ':6.2f')
progress = ProgressMeter(len(train_loader),
[batch_time, data_time, losses, top1, top5],
prefix="Epoch: [{}]".format(epoch))
# switch to train mode
model.train()
end = time.time()
for i, (images, target) in enumerate(train_loader):
# measure data loading time
data_time.update(time.time() - end)
# if args.gpu is not None:
# images = images.cuda(args.gpu, non_blocking=True)
# target = target.cuda(args.gpu, non_blocking=True)
# compute output
estimator.train_minibatch(images.numpy(),
target.numpy().astype(np.int32),
zooCriterion)
# output = model(images)
# loss = criterion(output, target)
#
# # measure accuracy and record loss
# acc1, acc5 = accuracy(output, target, topk=(1, 5))
# losses.update(loss.item(), images.size(0))
# top1.update(acc1[0], images.size(0))
# top5.update(acc5[0], images.size(0))
#
# # compute gradient and do SGD step
# optimizer.zero_grad()
# loss.backward()
# optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
progress.display(i)
def test_torch_net_predict(self):
model = torchvision.models.resnet18()
net = TorchNet.from_pytorch(model, [1, 3, 224, 224])
result = net.predict(np.random.rand(1, 3, 224, 224))
print(result.collect())
X_train = mnist.data.numpy() / 255.0
Y_train = mnist.train_labels.float().numpy()
pd_df = pd.DataFrame()
pd_df['features'] = X_train.reshape((X_train.shape[0], 784)).tolist()
pd_df['label'] = Y_train.reshape((Y_train.shape[0])).tolist()
mnistDF = spark.createDataFrame(pd_df)
(trainingDF, validationDF) = mnistDF.randomSplit([0.8, 0.2])
trainingDF.show()
# define loss with Pytorch API
def lossFunc(input, target):
return nn.CrossEntropyLoss().forward(input, target.flatten().long())
torch_model = LeNet()
model = TorchNet.from_pytorch(module=torch_model,
input_shape=[1, 1, 28, 28])
criterion = TorchCriterion.from_pytorch(loss=lossFunc,
input_shape=[1, 10],
sample_label=torch.LongTensor([5]))
classifier = NNClassifier(model, criterion, SeqToTensor([1, 28, 28])) \
.setBatchSize(64) \
.setOptimMethod(Adam()) \
.setLearningRate(0.001)\
.setMaxEpoch(2)
nnClassifierModel = classifier.fit(trainingDF)
print("After training: ")
shift = udf(lambda p: p - 1, DoubleType())
res = nnClassifierModel.transform(validationDF) \
.withColumn("prediction", shift(col('prediction')))
def main():
# Training settings
parser = argparse.ArgumentParser(description='PyTorch MNIST Example')
parser.add_argument('--batch-size',
type=int,
default=64,
metavar='N',
help='input batch size for training (default: 64)')
parser.add_argument('--test-batch-size',
type=int,
default=1000,
metavar='N',
help='input batch size for testing (default: 1000)')
parser.add_argument('--epochs',
type=int,
default=10,
metavar='N',
help='number of epochs to train (default: 10)')
parser.add_argument('--lr',
type=float,
default=0.01,
metavar='LR',
help='learning rate (default: 0.01)')
parser.add_argument('--momentum',
type=float,
default=0.5,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument('--no-cuda',
action='store_true',
default=False,
help='disables CUDA training')
parser.add_argument('--seed',
type=int,
default=1,
metavar='S',
help='random seed (default: 1)')
parser.add_argument(
'--log-interval',
type=int,
default=10,
metavar='N',
help='how many batches to wait before logging training status')
parser.add_argument('--save-model',
action='store_true',
default=False,
help='For Saving the current Model')
args = parser.parse_args()
use_cuda = not args.no_cuda and torch.cuda.is_available()
torch.manual_seed(args.seed)
device = torch.device("cuda" if use_cuda else "cpu")
kwargs = {'num_workers': 1, 'pin_memory': True} if use_cuda else {}
train_loader = torch.utils.data.DataLoader(datasets.MNIST(
'../data',
train=True,
download=True,
transform=transforms.Compose([
transforms.ToTensor(),
transforms.Normalize((0.1307, ), (0.3081, ))
])),
batch_size=args.batch_size,
shuffle=True,
**kwargs)
test_loader = torch.utils.data.DataLoader(datasets.MNIST(
'../data',
train=False,
transform=transforms.Compose([
transforms.ToTensor(),
transforms.Normalize((0.1307, ), (0.3081, ))
])),
batch_size=args.test_batch_size,
shuffle=True,
**kwargs)
model = Net().to(device)
optimizer = optim.SGD(model.parameters(),
lr=args.lr,
momentum=args.momentum)
num_executors = 4
num_cores_per_executor = 1
hadoop_conf_dir = os.environ.get('HADOOP_CONF_DIR')
sc = init_spark_on_yarn(
hadoop_conf=hadoop_conf_dir,
conda_name=os.
environ["ZOO_CONDA_NAME"], # The name of the created conda-env
num_executor=num_executors,
executor_cores=num_cores_per_executor,
executor_memory="10g",
driver_memory="10g",
driver_cores=1,
spark_conf={"spark.rpc.message.maxSize": "1024"})
model.train()
sgd = Adam()
zooModel = TorchNet.from_pytorch(model, [64, 1, 28, 28])
def lossFunc(input, target):
return nn.NLLLoss().forward(input, target.flatten().long())
zooCriterion = TorchCriterion.from_pytorch(lossFunc, [1, 2],
torch.LongTensor([1]))
# zooCriterion = SparseCategoricalCrossEntropy(zero_based_label=True)
estimator = Estimator(zooModel, optim_methods=sgd)
v_input = []
v_target = []
for data, target in test_loader:
v_input.append([data.numpy()])
v_target.append([target.numpy()])
test_featureset = FeatureSet.minibatch(v_input, v_target)
for epoch in range(1, args.epochs + 1):
train(args, estimator, zooCriterion, train_loader, epoch)
# test(args, estimator, zooCriterion, test_featureset)
estimator.evaluate_minibatch(
test_featureset,
[Loss(zooCriterion), Accuracy()])
if (args.save_model):
torch.save(model.state_dict(), "mnist_cnn.pt")
X_train = mnist.data.numpy() / 255.0
Y_train = mnist.train_labels.float().numpy()
pd_df = pd.DataFrame()
pd_df['features'] = X_train.reshape((X_train.shape[0], 784)).tolist()
pd_df['label'] = Y_train.reshape((Y_train.shape[0])).tolist()
mnistDF = spark.createDataFrame(pd_df)
(trainingDF, validationDF) = mnistDF.randomSplit([0.8, 0.2])
trainingDF.show()
# define loss with Pytorch API
def lossFunc(input, target):
return nn.CrossEntropyLoss().forward(input, target.flatten().long())
torch_model = LeNet()
model = TorchNet.from_pytorch(torch_model, [1, 1, 28, 28])
criterion = TorchCriterion.from_pytorch(lossFunc, [1, 10], torch.LongTensor([5]))
classifier = NNClassifier(model, criterion, SeqToTensor([1, 28, 28])) \
.setBatchSize(64) \
.setOptimMethod(Adam()) \
.setLearningRate(0.001)\
.setMaxEpoch(2)
nnClassifierModel = classifier.fit(trainingDF)
print("After training: ")
shift = udf(lambda p: p - 1, DoubleType())
res = nnClassifierModel.transform(validationDF) \
.withColumn("prediction", shift(col('prediction')))
res.show(100)
x = F.sigmoid(self.dense3(x))
return x
if __name__ == '__main__':
sparkConf = init_spark_conf().setAppName("testNNClassifer").setMaster(
'local[1]')
sc = init_nncontext(sparkConf)
sqlContext = SQLContext(sc)
df = get_df(sqlContext)
torch_model = SimpleTorchModel()
becloss = BCELoss()
model = TorchNet.from_pytorch(module=torch_model,
input_shape=[1, 2],
lossFunc=becloss.forward,
pred_shape=[1, 1],
label_shape=[1, 1])
classifier = NNEstimator(model, TorchIdentityCriterion(), SeqToTensor([2])) \
.setBatchSize(2) \
.setOptimMethod(Adam()) \
.setLearningRate(0.1) \
.setMaxEpoch(20)
nnClassifierModel = classifier.fit(df)
print("After training: ")
res = nnClassifierModel.transform(df)
res.show(10, False)
