def apply_gradients(self, apply_grads_func, grads_and_vars, **kwargs):
gradients, variables = list(zip(*grads_and_vars))
# logging.info("apply gradients is called here------------")
if self._reshape_strategy:
# logging.info("reshape on")
reshape_strategy(1)
else:
# logging.info("reshape called with int 0")
reshape_strategy(0)
if self._nccl:
# FIXME: We have a limitation that KungFu schedules NCCL operations
# in the order of the given gradients. This order is sub-optimal
# to the topological sorting order of dataflow. We get around of this issue by
# fusing all gradients. We need to figure out H ow to get the optimal topological s
# sortting order from TensorFlow.
if self._nccl_fusion:
fused_grad = fuse(gradients)
summed_fused_gradients = group_nccl_all_reduce([fused_grad])
summed_gradients = defuse(summed_fused_gradients[0],
[g.shape for g in gradients])
else:
summed_gradients = group_nccl_all_reduce(gradients)
else:
summed_gradients = group_all_reduce(gradients)
reduced_grads = map_maybe(lambda g: g / self._num_workers,
summed_gradients)
# We need to re-zip gradients and variables as grads_and_vars can be only unzipped once.
reduced_grads_and_vars = zip(reduced_grads, variables)
return apply_grads_func(reduced_grads_and_vars, **kwargs)
def benchmark_step(first_batch):
# reshape strategy here
reshape_strategy(reshape)
# gradient calculation and updates
with tf.GradientTape() as tape:
probs = model(data, training=True)
loss = tf.losses.categorical_crossentropy(target, probs)
gradients = tape.gradient(loss, model.trainable_variables)
opt.apply_gradients(zip(gradients, model.trainable_variables))
if first_batch:
from kungfu.tensorflow.initializer import broadcast_variables
broadcast_variables(model.variables)
broadcast_variables(opt.variables())
def run(benchmark_step):
# Warm-up
log('Running warmup...')
timeit.timeit(benchmark_step, number=args.num_warmup_batches)
# Benchmark
log('Running benchmark...')
img_secs = []
iteration_time = []
for x in range(args.num_iters):
#reshape_strategy op
session.run(reshape_strategy(reshape))
time = timeit.timeit(benchmark_step, number=args.num_batches_per_iter)
img_sec = args.batch_size * args.num_batches_per_iter / time
log('Iter #%d: %.1f img/sec per %s' % (x, img_sec, device))
log('iteration time : %.3f' % time)
img_secs.append(img_sec)
iteration_time.append(time)
# Results
log('mean iteration time: %.3f' % np.mean(iteration_time))
img_sec_mean = np.mean(img_secs)
img_sec_conf = 1.96 * np.std(img_secs)
log('Img/sec per %s: %.1f +-%.1f' % (device, img_sec_mean, img_sec_conf))
val_acc_metric = tf.metrics.SparseCategoricalAccuracy()
best_val_acc = 0
time_log = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
log_dir = f"tensorboard-logs/{args.name}/{time_log}"
summary_writer = tf.summary.create_file_writer(log_dir, flush_millis=10000)
step = 0
with summary_writer.as_default():
for epoch in range(NUM_EPOCHS):
print('Start of epoch %d' % (epoch + 1, ))
for batch, (images,
labels) in enumerate(train_dataset.take(NUM_STEPS)):
# reshape strategy before apply_gradients (and therefore AllReduce is called in KungFu)
reshape_strategy(reshape)
t0 = time.time()
probs, loss_value = training_step(mnist_model, opt, images,
labels, batch == 0)
print('training step %d, took %s' %
(step, show_duration(time.time() - t0)))
step += 1
# print(f"batch number here is {batch}")
# update training metric
train_acc_metric(labels, probs)
# Log loss metric every 10th step only on the 0th worker
if step % 3 == 0 and current_rank() == 0:
# print('Training step #%d\tLoss: %.6f' %
best_val_acc = 0
time_log = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
log_dir = f"tensorboard-logs/{args.name}/{time_log}"
summary_writer = tf.summary.create_file_writer(
log_dir, flush_millis=10000)
step = 0
with summary_writer.as_default():
for epoch in range(NUM_EPOCHS):
print('Start of epoch %d' % (epoch+1,))
for batch, (images, labels) in enumerate(train_dataset.take(NUM_STEPS)):
# reshape strategy before apply_gradients (and therefore AllReduce is called in KungFu)
keep = reshape_strategy()
if not keep:
print("RESHAPE STRATEGY DIDN'T WORK!!!!!!!!!!!!!!")
t0 = time.time()
probs, loss_value = training_step(
mnist_model, opt, images, labels, batch == 0)
print('training step %d, took %s' %
(step, show_duration(time.time() - t0)))
step += 1
# print(f"batch number here is {batch}")
# update training metric
train_acc_metric(labels, probs)
# Log loss metric every 10th step only on the 0th worker
return '%.2fs' % duration
sec = int(duration)
mm, ss = sec / 60, sec % 60
if duration < 3600:
return '%dm%ds' % (mm, ss)
return '%dh%dm%ds' % (mm / 60, mm % 60, ss)
# x = tf.Variable(tf.ones([], dtype=tf.int32))
x = tf.ones((10, 1), dtype=tf.int32)
print(x.numpy())
steps = 10
mean_time = []
for i in range(steps):
# reshape strategy before AllReduce to bypass straggler node
t1 = time.time()
keep = reshape_strategy(debug=False)
iteration_time = time.time() - t1
print('reshape took %s' % (show_duration(iteration_time)))
t0 = time.time()
v = all_reduce(x)
print('all reduce step %d, took %s' % (i, show_duration(time.time() - t0)))
mean_time.append(iteration_time)
if not keep:
break
print(np.mean(mean_time))
