def master_node(chunk_start: int, block: int, file_path: str,
q: BaseProxy) -> None:
"""Module implementing process wrapper for individual task splits
Performs aggregation on the file-splits it's operating upon.
Parameters
----------
chunk_start*: Pointer to the line from the file.
block*: Explicit chunk size (dynamically provided by the user or through RunningConstants enum).
file_path*: Support both relative, absolute references to the input file location.
q*: Multiprocessing manager queue to support FIFO based execution of the processed chunks
(* - Required parameters)
Returns
-------
None
"""
with open(file_path, 'r') as f:
f.seek(chunk_start)
lines = f.read(block).splitlines()
process_dict = dict()
for line in lines:
if line:
if 'Driver' in line:
# this if block may be redundant (if there's no requirement
# to validate Business_Rule-1 and Business_Rule-2 : Refer to
# section 'Possible Implementation' in Readme.md file)
if not line[7:] in process_dict:
process_dict[line[7:]] = (0, 0)
elif line[:4] == 'Trip':
driver_name, distance, time_spent = slave_node(line[5:])
if len(driver_name):
# (Business_Rule-1 and Business_Rule-2 : Refer to
# section 'Possible Implementation' in Readme.md file))
if driver_name not in process_dict:
process_dict[driver_name] = (distance, time_spent)
else:
# Adding miles, time_spent to the existing record
# in the dictionary
current_distance, current_time = process_dict[
driver_name]
process_dict[driver_name] = (current_distance +
distance,
current_time +
time_spent)
q.put(process_dict)
return
def prepare_jobs(batch_iterator, model_params, schema_params, num_features,
model_weights: dict, enable_local_indexing: bool,
job_queue: BaseProxy, has_intercept: bool):
"""
Utility method to take batches of TF grouped data and convert it into one or more Jobs.
Useful for running training and inference
:param batch_iterator: TF dataset feature, label batch iterator
:param model_params: model parameters to aid in converting to Job objects
:param schema_params: schema parameters to aid in converting to Job objects
:param num_features Number of features in global space
:param model_weights: Model coefficients, dict of {model_id: TrainingResult}
:param enable_local_indexing: Whether to index the features locally instead of use global indices
:param job_queue: A managed queue containing the generated jobs
:param has_intercept: whether to include intercept in the model
:return: a generator of entity_ids.
The feature_bag is represented in sparse tensor format. Take per_member feature bag for example.
The following batch has three records, two belonging to member #0 and one belonging to member #1.
member #0 has two records
per_member_indices = [[0, 7, 60, 80, 95], [34, 57]]
per_member_values = [[1.0, 2.0, 3.0, 5.0, 6.6], [1.0, 2.0]]
member #1 has one record
per_member_indices = [[10, 11]]
per_member_values = [[-3.5, 2.3]]
The batch combines both members' records:
per_member_indices = [[[0, 7, 60, 80, 95], [34, 57]], [[10, 11]]]
per_member_values = [[[1.0, 2.0, 3.0, 5.0, 6.6], [1.0, 2.0]], [[-3.5, 2.3]]]
Tensorflow representation of the batch above:
SparseTensorValue(indices=array(
[[0, 0, 0],
[0, 0, 1],
[0, 0, 2],
[0, 0, 3],
[0, 0, 4],
[0, 1, 0],
[0, 1, 1],
[1, 0, 0],
[1, 0, 1]]), values=array([ 1. , 2. , 3. , 5. , 6.6, 1. , 2. , -3.5, 2.3],
dtype=float32), dense_shape=array([2, 2, 5]))
Note the first dimension is the batch dimension.
"""
logger.info(
f"Kicking off job producer with enable_local_indexing = {enable_local_indexing}."
)
for features_val, labels_val in dataset_reader(batch_iterator()):
# Extract number of entities in batch
num_entities = features_val[model_params.partition_entity].shape[0]
# Now, construct entity_id, X, y, offsets and weights
X_index = 0
y_index = 0
for entity in range(num_entities):
ids_indices = features_val[schema_params.uid_column_name].indices
rows = ids_indices[np.where(ids_indices[:, 0] == entity)][:, 1]
sample_count_from_ids = rows.size
if model_params.feature_bag is None:
# intercept only model
assert (num_features == 1)
sample_count = sample_count_from_ids
values = np.zeros(sample_count)
cols = np.zeros(sample_count, dtype=int)
else:
# Construct data matrix X. Slice portion of arrays from X_index
# through the number of rows for the entity
features = features_val[model_params.feature_bag +
INDICES_SUFFIX]
indices = features.indices
rows = indices[np.where(indices[:, 0] == entity)][:, 1]
cols = features.values[X_index:X_index + len(rows)]
values = features_val[model_params.feature_bag +
VALUES_SUFFIX].values[X_index:X_index +
len(rows)]
# Get sample count
sample_count = np.amax(rows) + 1
# sanity check
assert (sample_count == sample_count_from_ids)
# Construct entity ID
raw_entity_id = features_val[model_params.partition_entity][entity]
if isinstance(raw_entity_id, bytes):
entity_id = raw_entity_id.decode('utf-8')
else:
entity_id = str(raw_entity_id)
result = model_weights.get(entity_id, None)
# generate index map
unique_global_indices, locally_indexed_cols = np.unique(
cols, return_inverse=True)
if enable_local_indexing:
# Use local indices to represent the data matrix.
X = coo_matrix((values, (rows, locally_indexed_cols)))
else:
# Use global indices to represent the data matrix.
X = coo_matrix((values, (rows, cols)),
shape=(sample_count, num_features))
# Construct y, offsets, weights and ids. Slice portion of arrays from y_index through sample_count
y = labels_val[
schema_params.label_column_name].values[y_index:y_index +
sample_count]
offsets = features_val[
model_params.offset_column_name].values[y_index:y_index +
sample_count]
weights = (features_val[schema_params.weight_column_name].
values[y_index:y_index +
sample_count] if schema_params.weight_column_name
in features_val else np.ones(sample_count))
ids = features_val[
schema_params.uid_column_name].values[y_index:y_index +
sample_count]
# If a prior model exists, get the coefficients to warm start the training.
# Note the prior model may have fewer or more features than the current dataset.
theta = None
if result:
model_rows = []
model_values = []
coeffs_without_intercept = result.theta[
1:] if has_intercept else result.theta
prior_model = {
u: v
for u, v in zip(result.unique_global_indices,
coeffs_without_intercept)
}
idx_offset = 0
if has_intercept:
# account for the intercept term
model_rows.append(0)
model_values.append(result.theta[0])
idx_offset = 1 # account for the intercept
for i, u in enumerate(unique_global_indices):
if u in prior_model:
r = i if enable_local_indexing else u
model_rows.append(
idx_offset + r) # +1 if bias is the first element.
model_values.append(prior_model[u])
model_cols = [0] * len(model_rows)
if enable_local_indexing:
# +1 if bias is used
coeffs_length = len(
unique_global_indices) + 1 if has_intercept else len(
unique_global_indices)
theta = csr_matrix(
(model_values, (model_rows, model_cols)),
shape=(coeffs_length, 1))
else:
# +1 if bias is used
coeffs_length = num_features + 1 if has_intercept else num_features
theta = csr_matrix(
(model_values, (model_rows, model_cols)),
shape=(coeffs_length, 1))
job = Job(entity_id,
X,
y,
offsets,
weights,
ids,
unique_global_indices,
theta=theta)
job_queue.put(job)
# use entity_id as a token, it may not be unique
yield entity_id
# Update X_index and y_index
y_index += sample_count
X_index += len(rows)
def _run_command(self,
cmd: list[str],
execution_time: list[float],
gpu_queue: BaseProxy = None) -> bool:
"""Run the encoding and decoding command. Based on the `debug`
flag, it will raise the ``CalledProcessError`` exception or add
the count of failures silently. Error messages will log into
files with timestamp in ``logs/``.
Parameters
----------
cmd : `list[str]`
Command to execute. In the same format with what subprocess
use.
execution_time : `list[float]`
A list to store the execution_time.
gpu_queue : `BaseProxy`, optional
A multiprocessing Manager.Queue() object. The queue stores
the GPU device IDs get from GPUtil.getAvailable(). Must be
assigned if running a PCC algorithm using GPUs. Defaults to
None.
Returns
-------
`bool`
True is successfully executed, False otherwise.
Raises
------
`e`
Exception ``subprocess.CalledProcessError``.
"""
if gpu_queue is not None:
gpu_id = gpu_queue.get()
# Inject environment variable `CUDA_VISIBLE_DEVICES` to ``cmd``.
env = dict(os.environ, CUDA_VISIBLE_DEVICES=str(gpu_id))
else:
env = os.environ
try:
start_time = time.time()
ret = sp.run(cmd,
cwd=self._algs_cfg['rootdir'],
env=env,
capture_output=True,
check=True)
end_time = time.time()
except sp.CalledProcessError as e:
timestamp = datetime.datetime.now().strftime('%Y%m%d_%H:%M:%S')
log_file = (Path(__file__).parents[1].joinpath(
f'logs/execute_cmd_{timestamp}.log'))
with open(log_file, 'w') as f:
lines = [
f"The stdout and stderr of executed command: ",
f"{''.join(str(s)+' ' for s in cmd)}",
"\n",
"===== stdout =====",
f"{e.stdout.decode('utf-8')}",
"\n",
"===== stderr =====",
f"{e.stderr.decode('utf-8')}",
]
f.writelines('\n'.join(lines))
logger.error(f"Error occurs when executing command: ",
f"{''.join(str(s)+' ' for s in cmd)}", "\n"
f"Check {log_file} for more informations.")
if self._debug is True:
raise e
else:
self._failure_cnt += 1
return False
else:
execution_time[0] = end_time - start_time
return True
finally:
if gpu_queue is not None:
gpu_queue.put(gpu_id)