class ModelPatchingCoordinator:
MODEL_STRUCTURE = BertStructure
def __init__(self, sparse_args, device, cache_dir, logit_names,
teacher_constructor):
# logit_names is ["start_logits", "end_logits"] for qa, ["logits"] for glue etc
# teacher modle is AutoModelForQuestionAnswering for qa, AutoModelForSequenceClassification for glue etc
self.sparse_args = sparse_args
self.patcher_context = PatcherContext()
self.teacher_constructor = teacher_constructor
self.teacher = self.create_teacher(device, cache_dir)
self.logit_names = logit_names
def parse_pruning_method(self, method):
parts = method.split(":")
if len(parts) == 2:
return parts
elif len(parts) == 1:
return parts[0], "default"
else:
raise RuntimeError("Could not parse pruning method")
def patch_model(self, model, trial):
raise NotImplementedError("Implement in subclass")
def log(self):
logs = {}
for k, v in self.patcher_context.enumerate_context_data():
logs[k] = v
return logs
def create_teacher(self, device, cache_dir):
sparse_args = self.sparse_args
if sparse_args.distil_teacher_name_or_path is not None:
assert sparse_args.distil_alpha_ce > 0.0
assert sparse_args.distil_alpha_ce + sparse_args.distil_alpha_teacher > 0.0
model_config = AutoConfig.from_pretrained(
sparse_args.distil_teacher_name_or_path, cache_dir=cache_dir)
teacher = self.teacher_constructor.from_pretrained(
sparse_args.distil_teacher_name_or_path,
from_tf=bool(
".ckpt" in sparse_args.distil_teacher_name_or_path),
config=model_config,
cache_dir=cache_dir,
)
print(teacher)
teacher.to(device)
else:
teacher = None
return teacher
def schedule_threshold(
self,
step: int = -1,
total_step: int = -1,
warmup_steps: int = -1,
training: bool = False,
):
sparse_args = self.sparse_args
initial_threshold = sparse_args.initial_threshold
final_threshold = sparse_args.final_threshold
initial_warmup = sparse_args.initial_warmup
final_warmup = sparse_args.final_warmup
final_lambda = sparse_args.regularization_final_lambda
initial_ampere_temperature = sparse_args.initial_ampere_temperature
final_ampere_temperature = sparse_args.final_ampere_temperature
if training:
if step <= initial_warmup * warmup_steps:
threshold = initial_threshold
ampere_temperature = initial_ampere_temperature
elif step > (total_step - final_warmup * warmup_steps):
threshold = final_threshold
ampere_temperature = final_ampere_temperature
else:
spars_warmup_steps = initial_warmup * warmup_steps
spars_schedu_steps = (final_warmup +
initial_warmup) * warmup_steps
mul_coeff = 1 - (step - spars_warmup_steps) / (
total_step - spars_schedu_steps)
threshold = final_threshold + (
initial_threshold - final_threshold) * (mul_coeff**3)
ampere_temperature = final_ampere_temperature + (
initial_ampere_temperature -
final_ampere_temperature) * (mul_coeff**3)
else:
threshold = final_threshold
ampere_temperature = final_ampere_temperature
regu_lambda = final_lambda * threshold / final_threshold
context_data = dict(
threshold=threshold,
ampere_temperature=ampere_temperature,
regu_lambda=regu_lambda,
)
self.patcher_context.set_context_data_dict(context_data)
def regularization_loss(self, model: nn.Module):
# Return regularization, lambda, and information on the network sparsity
mode = self.sparse_args.regularization
info = {}
regul_modes = ["l1", "l0"]
if mode in regul_modes:
threshold = self.patcher_context.get_context_data("threshold")
for name, module in model.named_modules():
if mode not in regul_modes:
if isinstance(module, nn.Linear):
weight = module.weight
module_regu = 0
module_nnz = (weight != 0).sum()
numel = weight.numel()
else:
continue
elif isinstance(module, PatcherContextModule):
param = module.mask_scores
numel = param.numel()
if mode == "l1":
module_regu = torch.norm(torch.sigmoid(param), p=1) / numel
module_nnz = (torch.sigmoid(param) >
threshold).sum().item()
elif mode == "l0":
assert (False)
module_regu = torch.sigmoid(
param - 2 / 3 * np.log(0.1 / 1.1)).sum() / numel
module_nnz = (
torch.sigmoid(param - 2 / 3 * np.log(0.1 / 1.1)) >
threshold).sum().item()
else:
assert (False)
else:
continue
# TEMPORARY : use model info to perform this dispatch
if not hasattr(self.sparse_args, "attention_output_with_dense"
) or self.sparse_args.attention_output_with_dense:
layer_names = ["key", "query", "value"]
key = "dense"
for ln in layer_names:
if ln in name:
key = "attention"
else:
key = "attention" if "attention" in name else "dense"
if key not in info:
info[key] = defaultdict(float)
key_info = info[key]
key_info["regu"] += module_regu
key_info["nnz"] += float(module_nnz)
key_info["numel"] += numel
key_info["nummod"] += 1
if mode not in regul_modes:
lamb = 0
lambdas = dict(attention=0, dense=0)
else:
lamb = self.patcher_context.get_context_data("regu_lambda")
lambdas = dict(attention=self.sparse_args.attention_lambda * 0.5,
dense=self.sparse_args.dense_lambda * 0.5)
info["total"] = defaultdict(float)
for key, value in info.items():
if key == "total":
continue
for k, v in value.items():
if k in ["numel", "nnz"]:
info["total"][k] += v
for key, value in info.items():
value["nnz_perc"] = value["nnz"] / value["numel"]
del value["nnz"]
del value["numel"]
if key == "total":
continue
value["regu_loss"] = value["regu"] * lambdas[key] / value["nummod"]
info["total"]["regu_loss"] += value["regu_loss"]
del value["regu"]
del value["nummod"]
return info["total"]["regu_loss"], lamb, info
def distil_loss_combine(self, ce_loss, model_inputs, model_outputs):
sparse_args = self.sparse_args
teacher = self.teacher
if teacher == None:
return ce_loss
temperature = sparse_args.distil_temperature
with torch.no_grad():
teacher_outputs = teacher(
input_ids=model_inputs["input_ids"],
token_type_ids=model_inputs["token_type_ids"],
attention_mask=model_inputs["attention_mask"],
)
loss_logits = 0
for logit_name in self.logit_names:
logits_stu = model_outputs[logit_name]
logits_tea = teacher_outputs[logit_name]
loss_logits_part = nn_functional.kl_div(
input=nn_functional.log_softmax(logits_stu / temperature,
dim=-1),
target=nn_functional.softmax(logits_tea / temperature, dim=-1),
reduction="batchmean",
) * (temperature**2)
loss_logits += loss_logits_part
loss_logits /= len(self.logit_names)
loss = sparse_args.distil_alpha_teacher * loss_logits + sparse_args.distil_alpha_ce * ce_loss
return loss, loss_logits
def create_optimizer_groups(self, model, args, sparse_args):
# Prepare optimizer and schedule (linear warmup and decay)
no_decay = ["bias", "LayerNorm.weight"]
mask_params = []
no_decay_params = []
decay_params = []
for n, p in model.named_parameters():
if not p.requires_grad:
continue
if "mask_score" in n:
mask_params.append(p)
elif any(nd in n for nd in no_decay):
no_decay_params.append(p)
else:
decay_params.append(p)
optimizer_grouped_parameters = [
{
"params": mask_params,
"lr": sparse_args.mask_scores_learning_rate,
},
{
"params": no_decay_params,
"lr": args.learning_rate,
"weight_decay": 0.0,
},
{
"params": decay_params,
"lr": args.learning_rate,
"weight_decay": args.weight_decay,
},
]
return optimizer_grouped_parameters
def compile_model(self, model):
self.schedule_threshold()
compiler = MaskedLinearModelCompiler()
compiler.patch(model)
def patch_model(self, model, trial):
assert trial is None or len(trial.params) == 0
attention_pruning_method_parts = self.parse_pruning_method(
self.sparse_args.attention_pruning_method)
if hasattr(self.sparse_args, "bias_mask"):
bias_mask = self.sparse_args.bias_mask
else:
bias_mask = False
args_attention = LinearPruningArgs(
method=attention_pruning_method_parts[0],
submethod=attention_pruning_method_parts[1],
ampere_method=self.sparse_args.ampere_pruning_method,
block_rows=self.sparse_args.attention_block_rows,
block_cols=self.sparse_args.attention_block_cols,
bias_mask=bias_mask)
args_attention_t = LinearPruningArgs(
method=attention_pruning_method_parts[0],
submethod=attention_pruning_method_parts[1],
ampere_method=self.sparse_args.ampere_pruning_method,
block_rows=self.sparse_args.attention_block_cols,
block_cols=self.sparse_args.attention_block_rows,
bias_mask=bias_mask)
dense_pruning_method_parts = self.parse_pruning_method(
self.sparse_args.dense_pruning_method)
args_dense = LinearPruningArgs(
method=dense_pruning_method_parts[0],
submethod=dense_pruning_method_parts[1],
ampere_method=self.sparse_args.ampere_pruning_method,
block_rows=self.sparse_args.dense_block_rows,
block_cols=self.sparse_args.dense_block_cols,
bias_mask=bias_mask)
patcher_context = self.patcher_context
if args_attention.submethod == "joint":
p_attention = JointPruningModulePatcher(patcher_context,
args_attention,
suffix=".attention")
p_attention_t = JointPruningModulePatcher(patcher_context,
args_attention_t,
suffix=".attention")
else:
p_attention = LinearPruningModulePatcher(patcher_context,
args_attention)
p_attention_t = LinearPruningModulePatcher(patcher_context,
args_attention_t)
if args_dense.submethod.startswith("1d"):
p_dense = ChannelPruningModulePatcher(patcher_context,
args_dense,
self.MODEL_STRUCTURE,
suffix="dense")
else:
p_dense = LinearPruningModulePatcher(patcher_context, args_dense)
if not hasattr(self.sparse_args, "attention_output_with_dense"
) or self.sparse_args.attention_output_with_dense:
p_att_dense = p_dense
else:
p_att_dense = p_attention_t
module_patchers = dict(
query=p_attention,
key=p_attention,
value=p_attention,
att_dense=p_att_dense,
interm_dense=p_dense,
output_dense=p_dense,
)
patcher = BertLinearModelPatcher(module_patchers)
patcher.patch(model)
assert ((patcher.stats["patched"] % 72) == 0)
return patcher
class ModelPatchingCoordinator:
MODEL_STRUCTURE = BertStructure
def __init__(self, sparse_args, device, cache_dir, logit_names,
teacher_constructor):
# logit_names is ["start_logits", "end_logits"] for qa, ["logits"] for glue etc
# teacher model is AutoModelForQuestionAnswering for qa, AutoModelForSequenceClassification for glue etc
self.sparse_args = sparse_args
self.patcher_context = PatcherContext()
self.teacher_constructor = teacher_constructor
self.teacher = self.create_teacher(device, cache_dir)
self.logit_names = logit_names
def parse_pruning_method(self, method):
parts = method.split(":")
if len(parts) == 2:
return parts
elif len(parts) == 1:
return parts[0], "default"
else:
raise RuntimeError("Could not parse pruning method")
def log(self):
logs = {}
for k, v in self.patcher_context.enumerate_context_data():
logs[k] = v
return logs
def create_teacher(self, device, cache_dir):
sparse_args = self.sparse_args
if sparse_args.distil_teacher_name_or_path is not None:
assert sparse_args.distil_alpha_ce > 0.0
assert sparse_args.distil_alpha_ce + sparse_args.distil_alpha_teacher > 0.0
model_config = AutoConfig.from_pretrained(
sparse_args.distil_teacher_name_or_path, cache_dir=cache_dir)
teacher = self.teacher_constructor.from_pretrained(
sparse_args.distil_teacher_name_or_path,
from_tf=bool(
".ckpt" in sparse_args.distil_teacher_name_or_path),
config=model_config,
cache_dir=cache_dir,
)
print(teacher)
teacher.to(device)
else:
teacher = None
return teacher
def schedule_threshold(
self,
step: int = -1,
total_step: int = -1,
warmup_steps: int = -1,
training: bool = False,
):
sparse_args = self.sparse_args
initial_threshold = sparse_args.initial_threshold
final_threshold = sparse_args.final_threshold
initial_warmup = sparse_args.initial_warmup
final_warmup = sparse_args.final_warmup
final_lambda = sparse_args.regularization_final_lambda
initial_ampere_temperature = sparse_args.initial_ampere_temperature
final_ampere_temperature = sparse_args.final_ampere_temperature
if training:
if step <= initial_warmup * warmup_steps:
threshold = initial_threshold
ampere_temperature = initial_ampere_temperature
elif step > (total_step - final_warmup * warmup_steps):
threshold = final_threshold
ampere_temperature = final_ampere_temperature
else:
spars_warmup_steps = initial_warmup * warmup_steps
spars_schedu_steps = (final_warmup +
initial_warmup) * warmup_steps
mul_coeff = 1 - (step - spars_warmup_steps) / (
total_step - spars_schedu_steps)
threshold = final_threshold + (
initial_threshold - final_threshold) * (mul_coeff**3)
ampere_temperature = final_ampere_temperature + (
initial_ampere_temperature -
final_ampere_temperature) * (mul_coeff**3)
else:
threshold = final_threshold
ampere_temperature = final_ampere_temperature
regu_lambda = final_lambda * threshold / final_threshold
context_data = dict(threshold=threshold,
regu_lambda=regu_lambda,
ampere_temperature=ampere_temperature)
def interp(a, b, interpf):
return a * interpf + (1.0 - interpf) * b
if hasattr(sparse_args,
"layer_norm_patch") and sparse_args.layer_norm_patch:
if training:
interpf = 0.0
layer_norm_patch_steps = sparse_args.layer_norm_patch_steps
if step < layer_norm_patch_steps:
interpf = 1.0 - (step / layer_norm_patch_steps)
delta = interp(sparse_args.layer_norm_patch_start_delta, 1.0,
interpf)
mix = interpf
context_data["layernorm_to_nonorm_delta"] = delta
context_data["layernorm_to_nonorm_mix"] = mix
else:
context_data["layernorm_to_nonorm_delta"] = 1.0
context_data["layernorm_to_nonorm_mix"] = 0.0
if hasattr(sparse_args, "gelu_patch") and sparse_args.gelu_patch:
if training:
interpf = 0.0
gelu_patch_steps = sparse_args.gelu_patch_steps
if step < gelu_patch_steps:
interpf = 1.0 - (step / gelu_patch_steps)
context_data["gelu_to_relu_mix"] = interpf
else:
context_data["gelu_to_relu_mix"] = 0.0
self.patcher_context.set_context_data_dict(context_data)
def regularization_loss(self, model: nn.Module):
# Return regularization, lambda, and information on the network sparsity
mode = self.sparse_args.regularization
info = {}
regul_modes = ["l1", "l0"]
if mode in regul_modes:
threshold = self.patcher_context.get_context_data("threshold")
for name, module in model.named_modules():
module_regu = 0
module_nnz_info = {"nnz": 0, "numel": 0}
nummod = 1
if mode not in regul_modes:
if isinstance(module, nn.Linear):
weight = module.weight
module_nnz_info["nnz"] = (weight != 0).sum()
module_nnz_info["numel"] = weight.numel()
else:
continue
elif isinstance(module, GenericLinearPruningContextModule):
module_regu = module.regularization(mode)
elif isinstance(module, MaskedLinear):
module_nnz_info = module.get_sparsity_info()
nummod = 0
else:
continue
# TEMPORARY : use model info to perform this dispatch
if not hasattr(self.sparse_args, "attention_output_with_dense"
) or self.sparse_args.attention_output_with_dense:
layer_names = ["key", "query", "value"]
key = "dense"
for ln in layer_names:
if ln in name:
key = "attention"
else:
key = "attention" if "attention" in name else "dense"
if key not in info:
info[key] = defaultdict(float)
key_info = info[key]
key_info["regu"] += module_regu
key_info["nummod"] += nummod
for k, v in module_nnz_info.items():
key_info[k] += float(v)
if mode not in regul_modes:
lamb = 0
lambdas = dict(attention=0, dense=0)
else:
lamb = self.patcher_context.get_context_data("regu_lambda")
lambdas = dict(attention=self.sparse_args.attention_lambda * 0.5,
dense=self.sparse_args.dense_lambda * 0.5)
info["total"] = defaultdict(float)
for key, value in info.items():
if key == "total":
continue
for k, v in value.items():
if k == "numel" or "nnz" in k:
info["total"][k] += v
for key, value in info.items():
if value["numel"] != 0:
# No patching (no pruning) -> no information on nnz -> dense linear layers
value["nnz_perc"] = value["nnz"] / value["numel"]
else:
value["nnz_perc"] = 1.0
for k in "nnz", "numel":
if k in value:
del value[k]
if key == "total":
continue
if value["nummod"] != 0:
value["regu_loss"] = value["regu"] * lambdas[key] / value[
"nummod"]
info["total"]["regu_loss"] += value["regu_loss"]
for k in "regu", "nummod":
if k in value:
del value[k]
return info["total"]["regu_loss"], lamb, info
def distil_loss_combine(self, ce_loss, model_inputs, model_outputs):
sparse_args = self.sparse_args
teacher = self.teacher
if teacher == None:
return ce_loss, 0.0
temperature = sparse_args.distil_temperature
with torch.no_grad():
teacher_outputs = teacher(
input_ids=model_inputs["input_ids"],
token_type_ids=model_inputs["token_type_ids"],
attention_mask=model_inputs["attention_mask"],
)
loss_logits = 0
for logit_name in self.logit_names:
logits_stu = model_outputs[logit_name]
logits_tea = teacher_outputs[logit_name]
loss_logits_part = nn_functional.kl_div(
input=nn_functional.log_softmax(logits_stu / temperature,
dim=-1),
target=nn_functional.softmax(logits_tea / temperature, dim=-1),
reduction="batchmean",
) * (temperature**2)
loss_logits += loss_logits_part
loss_logits /= len(self.logit_names)
loss = sparse_args.distil_alpha_teacher * loss_logits + sparse_args.distil_alpha_ce * ce_loss
return loss, loss_logits
def create_optimizer_groups(self, model, args, sparse_args):
# Prepare optimizer and schedule (linear warmup and decay)
no_decay = [
"bias", "LayerNorm.weight", "NoNorm.weight", "LayerNorm.bias",
"NoNorm.bias"
]
mask_params = []
no_decay_params = []
decay_params = []
for n, p in model.named_parameters():
if not p.requires_grad:
continue
if "mask_score" in n:
mask_params.append(p)
elif any(nd in n for nd in no_decay):
no_decay_params.append(p)
else:
decay_params.append(p)
optimizer_grouped_parameters = [
{
"params": mask_params,
"lr": sparse_args.mask_scores_learning_rate,
},
{
"params": no_decay_params,
"lr": args.learning_rate,
"weight_decay": 0.0,
},
{
"params": decay_params,
"lr": args.learning_rate,
"weight_decay": args.weight_decay,
},
]
return optimizer_grouped_parameters
def patch_model(self, model, trial=None):
layers_count = model.config.num_hidden_layers
sparse_args = self.sparse_args
attention_pruning_method_parts = self.parse_pruning_method(
sparse_args.attention_pruning_method)
if hasattr(sparse_args, "bias_mask"):
bias_mask = sparse_args.bias_mask
else:
bias_mask = False
if hasattr(sparse_args, "linear_min_parameters"):
linear_min_parameters = sparse_args.linear_min_parameters
else:
linear_min_parameters = 0.005
patcher_context = self.patcher_context
if attention_pruning_method_parts[
0] != "disabled" or sparse_args.ampere_pruning_method != "disabled":
args_attention = LinearPruningArgs(
method=attention_pruning_method_parts[0],
submethod=attention_pruning_method_parts[1],
ampere_method=sparse_args.ampere_pruning_method,
block_rows=sparse_args.attention_block_rows,
block_cols=sparse_args.attention_block_cols,
bias_mask=bias_mask,
min_elements=linear_min_parameters,
)
args_attention_t = LinearPruningArgs(
method=attention_pruning_method_parts[0],
submethod=attention_pruning_method_parts[1],
ampere_method=sparse_args.ampere_pruning_method,
block_rows=sparse_args.attention_block_cols,
block_cols=sparse_args.attention_block_rows,
bias_mask=bias_mask,
min_elements=linear_min_parameters,
)
if args_attention.submethod == "joint":
p_attention = JointPruningModulePatcher(patcher_context,
args_attention,
suffix=".attention")
p_attention_t = JointPruningModulePatcher(patcher_context,
args_attention_t,
suffix=".attention")
else:
p_attention = LinearPruningModulePatcher(
patcher_context, args_attention)
p_attention_t = LinearPruningModulePatcher(
patcher_context, args_attention_t)
else:
p_attention = None
p_attention_t = None
dense_pruning_method_parts = self.parse_pruning_method(
sparse_args.dense_pruning_method)
if dense_pruning_method_parts[
0] != "disabled" or sparse_args.ampere_pruning_method != "disabled":
args_dense = LinearPruningArgs(
method=dense_pruning_method_parts[0],
submethod=dense_pruning_method_parts[1],
ampere_method=sparse_args.ampere_pruning_method,
block_rows=sparse_args.dense_block_rows,
block_cols=sparse_args.dense_block_cols,
bias_mask=bias_mask,
min_elements=linear_min_parameters,
)
if args_dense.submethod.startswith("1d"):
p_dense = ChannelPruningModulePatcher(patcher_context,
args_dense,
self.MODEL_STRUCTURE,
suffix="dense")
else:
p_dense = LinearPruningModulePatcher(patcher_context,
args_dense)
else:
p_dense = None
if not hasattr(sparse_args, "attention_output_with_dense"
) or sparse_args.attention_output_with_dense:
p_att_dense = p_dense
else:
p_att_dense = p_attention_t
module_patchers = dict(
query=p_attention,
key=p_attention,
value=p_attention,
att_dense=p_att_dense,
interm_dense=p_dense,
output_dense=p_dense,
)
if hasattr(sparse_args, "layer_norm_patch"):
layer_norm_patch = sparse_args.layer_norm_patch
else:
layer_norm_patch = False
if hasattr(sparse_args, "gelu_patch"):
gelu_patch = sparse_args.gelu_patch
else:
gelu_patch = False
patcher = BertLinearModelPatcher(module_patchers)
patcher.patch(model)
patched_count = 0
if attention_pruning_method_parts[
0] != "disabled" or sparse_args.ampere_pruning_method != "disabled":
patched_count += 4 * layers_count
if dense_pruning_method_parts[
0] != "disabled" or sparse_args.ampere_pruning_method != "disabled":
patched_count += 2 * layers_count
assert (patcher.stats["patched"] == patched_count)
if layer_norm_patch:
def schedule_callback():
mix = self.patcher_context.get_context_data(
"layernorm_to_nonorm_mix")
delta = self.patcher_context.get_context_data(
"layernorm_to_nonorm_delta")
return dict(mix=mix, delta=delta)
layer_norm_patcher = Layer2NoNormPatcher(
schedule_callback=schedule_callback)
layer_norm_patcher.patch(model)
layer_norm_patched_count = 2 * layers_count + 1
assert (layer_norm_patcher.stats["patched"] ==
layer_norm_patched_count)
if gelu_patch:
def schedule_callback():
mix = self.patcher_context.get_context_data("gelu_to_relu_mix")
return dict(mix=mix)
gelu_patcher = GeLU2ReLUModelPatcher(
schedule_callback=schedule_callback)
gelu_patcher.patch(model)
gelu_patcher_count = layers_count
assert (gelu_patcher.stats["patched"] == gelu_patcher_count)
return patcher
def compile_model(self, model):
self.schedule_threshold()
compiler = MaskedLinearModelCompiler()
compiler.patch(model)
if hasattr(self.sparse_args,
"layer_norm_patch") and self.sparse_args.layer_norm_patch:
nnc = NoNormCompiler()
nnc.patch(model)
model.config.layer_norm_type = "no_norm"
if hasattr(self.sparse_args,
"gelu_patch") and self.sparse_args.gelu_patch:
model.config.hidden_act = "relu"
pruner = BertHeadsPruner(model)
removed_heads, total_heads = pruner.run()
return removed_heads, total_heads
class ModelPatchingCoordinator:
def __init__(self, sparse_args, device, cache_dir, model_name_or_path, logit_names, teacher_constructor):
# logit_names is ["start_logits", "end_logits"] for qa, ["logits"] for glue etc
# teacher model is AutoModelForQuestionAnswering for qa, AutoModelForSequenceClassification for glue etc
self.sparse_args = sparse_args
self.patcher_context = PatcherContext()
self.teacher_constructor = teacher_constructor
self.device = device
self.cache_dir = cache_dir
self.teacher = None
self.layer_head_mask = self.create_head_rewind_info(device, cache_dir)
self.logit_names = logit_names
self.model_name_or_path = model_name_or_path
config = AutoConfig.from_pretrained(model_name_or_path, cache_dir=cache_dir)
self.model_structure = struct_from_config(config.__class__)
def parse_pruning_method(self, method):
parts = method.split(":")
if len(parts) == 2:
return parts
elif len(parts) == 1:
return parts[0], "default"
else:
raise RuntimeError("Could not parse pruning method")
def log(self):
logs = {}
for k, v in self.patcher_context.enumerate_context_data():
logs[k] = v
return logs
def create_teacher(self):
if self.teacher is not None:
return self.teacher
device = self.device
cache_dir = self.cache_dir
sparse_args = self.sparse_args
if sparse_args.distil_teacher_name_or_path is not None:
assert sparse_args.distil_alpha_ce > 0.0
assert sparse_args.distil_alpha_ce + sparse_args.distil_alpha_teacher > 0.0
model_config = AutoConfig.from_pretrained(sparse_args.distil_teacher_name_or_path, cache_dir=cache_dir)
teacher = self.teacher_constructor.from_pretrained(
sparse_args.distil_teacher_name_or_path,
from_tf=bool(".ckpt" in sparse_args.distil_teacher_name_or_path),
config=model_config,
cache_dir=cache_dir,
)
teacher.to(device)
self.teacher = teacher
return self.teacher
def create_head_rewind_info(self, device, cache_dir):
if not hasattr(self.sparse_args, "rewind_model_name_or_path"):
return None
rewind_model_name_or_path = self.sparse_args.rewind_model_name_or_path
if rewind_model_name_or_path is None:
return None
else:
rewind_config = AutoConfig.from_pretrained(rewind_model_name_or_path, cache_dir=cache_dir)
return head_mask(rewind_config, device)
def schedule_threshold(
self,
step: int = -1,
total_step: int = -1,
warmup_steps: int = -1,
training: bool = False,
compile:bool = False,
):
sparse_args = self.sparse_args
initial_threshold = sparse_args.initial_threshold
final_threshold = sparse_args.final_threshold
initial_warmup = sparse_args.initial_warmup
final_warmup = sparse_args.final_warmup
final_lambda = sparse_args.regularization_final_lambda
initial_ampere_temperature = sparse_args.initial_ampere_temperature
final_ampere_temperature = sparse_args.final_ampere_temperature
if not training:
step -= 1
eval_with_current_patch_params = (hasattr(sparse_args, "eval_with_current_patch_params") and sparse_args.eval_with_current_patch_params)
use_scheduler = training or eval_with_current_patch_params
if compile:
if use_scheduler:
base_path = Path(self.model_name_or_path)
training_args = torch.load(str(base_path / "training_args.bin"))
warmup_steps = training_args.warmup_steps
with (base_path / "trainer_state.json").open() as f:
trainer_state = json.load(f)
step = trainer_state["global_step"]
total_step = trainer_state["max_steps"]
if use_scheduler:
if step <= initial_warmup * warmup_steps:
mul_coeff = 1.0
threshold = initial_threshold
ampere_temperature = initial_ampere_temperature
elif step > (total_step - final_warmup * warmup_steps):
mul_coeff = 0.0
threshold = final_threshold
ampere_temperature = final_ampere_temperature
else:
spars_warmup_steps = initial_warmup * warmup_steps
spars_schedu_steps = (final_warmup + initial_warmup) * warmup_steps
mul_coeff = 1 - (step - spars_warmup_steps) / (total_step - spars_schedu_steps)
threshold = final_threshold + (initial_threshold - final_threshold) * (mul_coeff ** 3)
ampere_temperature = final_ampere_temperature + (
initial_ampere_temperature - final_ampere_temperature
) * (mul_coeff ** 3)
else:
mul_coeff = 0.0
threshold = final_threshold
ampere_temperature = final_ampere_temperature
regu_lambda = final_lambda * threshold / final_threshold
context_data = dict(
threshold=threshold,
regu_lambda=regu_lambda,
ampere_temperature = ampere_temperature,
progress = 1.0 - mul_coeff
)
def interp(a,b, interpf):
return a * interpf + (1.0 - interpf) * b
if hasattr(sparse_args, "layer_norm_patch") and sparse_args.layer_norm_patch:
if use_scheduler:
interpf = 0.0
layer_norm_patch_steps = sparse_args.layer_norm_patch_steps
if step < layer_norm_patch_steps:
interpf = 1.0 - (step / layer_norm_patch_steps)
delta = interp(sparse_args.layer_norm_patch_start_delta, 1.0, interpf)
mix = interpf
context_data["layernorm_to_nonorm_delta"] = delta
context_data["layernorm_to_nonorm_mix"] = mix
else:
context_data["layernorm_to_nonorm_delta"] = 1.0
context_data["layernorm_to_nonorm_mix"] = 0.0
if hasattr(sparse_args, "gelu_patch") and sparse_args.gelu_patch:
if use_scheduler:
interpf = 0.0
gelu_patch_steps = sparse_args.gelu_patch_steps
if step < gelu_patch_steps:
interpf = 1.0 - (step / gelu_patch_steps)
context_data["gelu_to_relu_mix"] = interpf
else:
context_data["gelu_to_relu_mix"] = 0.0
self.patcher_context.set_context_data_dict(context_data)
def regularization_loss(self, model: nn.Module):
# Return regularization, lambda, and information on the network sparsity
mode = self.sparse_args.regularization
info = {}
regul_modes = ["l1", "l0"]
if mode in regul_modes:
threshold = self.patcher_context.get_context_data("threshold")
for name, module in model.named_modules():
module_regu = 0
module_nnz_info = {"nnz":0, "numel":0}
nummod = 1
if mode not in regul_modes:
if isinstance(module, nn.Linear):
weight = module.weight
module_nnz_info["nnz"] = (weight != 0).sum()
module_nnz_info["numel"] = weight.numel()
else:
continue
elif isinstance(module, GenericLinearPruningContextModule):
module_regu = module.regularization(mode)
elif isinstance(module, MaskedLinear):
module_nnz_info = module.get_sparsity_info()
nummod = 0
elif hasattr(module, "regularization"):
module_regu = module.regularization()
if hasattr(module, "get_sparsity_info"):
module_nnz_info = module.get_sparsity_info()
else:
continue
key = "decoder_" if self.model_structure.is_decoder(name) else ""
exclude_att_dense = not hasattr(self.sparse_args, "attention_output_with_dense") or self.sparse_args.attention_output_with_dense
key += "attention" if self.model_structure.is_attention(name, exclude_att_dense=exclude_att_dense) else "dense"
if key not in info:
info[key] = defaultdict(float)
key_info = info[key]
key_info["regu"] += module_regu
key_info["nummod"] += nummod
for k,v in module_nnz_info.items():
key_info[k] += float(v)
if mode not in regul_modes:
lamb = 0
lambdas = {k: 0 for k in info.keys()}
else:
lamb = self.patcher_context.get_context_data("regu_lambda")
lambdas = {}
n = len(info)
for k in info.keys():
if k.endswith('attention'):
if k.startswith('decoder'):
if self.sparse_args.decoder_attention_lambda is None:
self.sparse_args.decoder_attention_lambda = self.sparse_args.attention_lambda
lambdas[k] = self.sparse_args.decoder_attention_lambda / n
else:
lambdas[k] = self.sparse_args.attention_lambda / n
else:
if k.startswith('decoder'):
if self.sparse_args.decoder_dense_lambda is None:
self.sparse_args.decoder_dense_lambda = self.sparse_args.dense_lambda
lambdas[k] = self.sparse_args.decoder_dense_lambda / n
else:
lambdas[k] = self.sparse_args.dense_lambda / n
info["total"] = defaultdict(float)
for key, value in info.items():
if key == "total":
continue
for k, v in value.items():
if k == "numel" or "nnz" in k:
info["total"][k] += v
for key, value in info.items():
if value["numel"] != 0:
# No patching (no pruning) -> no information on nnz -> dense linear layers
value["nnz_perc"] = value["nnz"] / value["numel"]
else:
value["nnz_perc"] = 1.0
for k in "nnz", "numel":
if k in value:
del value[k]
if key == "total":
continue
if value["nummod"] != 0:
value["regu_loss"] = value["regu"] * lambdas[key] / value["nummod"]
info["total"]["regu_loss"] += value["regu_loss"]
for k in "regu", "nummod":
if k in value:
del value[k]
return info["total"]["regu_loss"], lamb, info
def distil_loss_combine(self, ce_loss, model_inputs, model_outputs):
sparse_args = self.sparse_args
teacher = self.create_teacher()
if teacher == None:
return ce_loss, 0.0
temperature = sparse_args.distil_temperature
teacher_inputs_ = model_inputs.copy()
if 'labels' in teacher_inputs_:
del teacher_inputs_['labels']
teacher_inputs = {}
for k,v in teacher_inputs_.items():
teacher_inputs[k] = v.detach().clone()
with torch.no_grad():
teacher_outputs = teacher(**teacher_inputs)
loss_logits = 0
for logit_name in self.logit_names:
logits_stu = model_outputs[logit_name]
logits_tea = teacher_outputs[logit_name].detach().clone()
loss_logits_part = nn_functional.kl_div(
input=nn_functional.log_softmax(logits_stu / temperature, dim=-1),
target=nn_functional.softmax(logits_tea / temperature, dim=-1),
reduction="batchmean",
) * (temperature ** 2)
loss_logits = loss_logits + loss_logits_part
loss_logits = loss_logits / len(self.logit_names)
loss = sparse_args.distil_alpha_teacher * loss_logits + sparse_args.distil_alpha_ce * ce_loss
return loss, loss_logits
def create_optimizer_groups(self, model, args, sparse_args):
# Prepare optimizer and schedule (linear warmup and decay)
no_decay = ["bias", "LayerNorm.weight", "NoNorm.weight", "layer_norm.weight", "layernorm_embedding.weight",
"final_layer_norm.weight"]
mask_params = []
no_decay_params = []
decay_params = []
for n, p in model.named_parameters():
if not p.requires_grad:
continue
if "mask_score" in n:
mask_params.append(p)
elif any(nd in n for nd in no_decay):
no_decay_params.append(p)
else:
decay_params.append(p)
optimizer_grouped_parameters = [
{
"params": mask_params,
"lr": sparse_args.mask_scores_learning_rate,
},
{
"params": no_decay_params,
"lr": args.learning_rate,
"weight_decay": 0.0,
},
{
"params": decay_params,
"lr": args.learning_rate,
"weight_decay": args.weight_decay,
},
]
return optimizer_grouped_parameters
def patch_model(self, model, trial = None):
layers_count = model.config.num_hidden_layers
sparse_args = self.sparse_args
device = model.device
attention_pruning_method_parts = self.parse_pruning_method(sparse_args.attention_pruning_method)
if hasattr(sparse_args, "bias_mask"):
bias_mask = sparse_args.bias_mask
else:
bias_mask = False
if hasattr(sparse_args, "linear_min_parameters"):
linear_min_parameters = sparse_args.linear_min_parameters
else:
linear_min_parameters = 0.005
patcher_context = self.patcher_context
if attention_pruning_method_parts[0] != "disabled" or sparse_args.ampere_pruning_method != "disabled":
args_attention = LinearPruningArgs(
method=attention_pruning_method_parts[0],
submethod=attention_pruning_method_parts[1],
ampere_method=sparse_args.ampere_pruning_method,
block_rows=sparse_args.attention_block_rows,
block_cols=sparse_args.attention_block_cols,
bias_mask=bias_mask,
min_elements=linear_min_parameters,
)
args_attention_t = LinearPruningArgs(
method=attention_pruning_method_parts[0],
submethod=attention_pruning_method_parts[1],
ampere_method=sparse_args.ampere_pruning_method,
block_rows=sparse_args.attention_block_cols,
block_cols=sparse_args.attention_block_rows,
bias_mask=bias_mask,
min_elements=linear_min_parameters,
)
if args_attention.submethod == "joint":
p_attention = JointPruningModulePatcher(patcher_context, args_attention, model_structure=self.model_structure, suffix=".attention")
p_attention_t = JointPruningModulePatcher(patcher_context, args_attention_t, model_structure=self.model_structure, suffix=".attention")
else:
p_attention = LinearPruningModulePatcher(patcher_context,
args_attention,
model_structure=self.model_structure,
row_additive_mask = self.layer_head_mask)
p_attention_t = LinearPruningModulePatcher(patcher_context,
args_attention_t,
model_structure = self.model_structure,
col_additive_mask = self.layer_head_mask)
else:
p_attention = None
p_attention_t = None
dense_pruning_method_parts = self.parse_pruning_method(sparse_args.dense_pruning_method)
if dense_pruning_method_parts[0] != "disabled" or sparse_args.ampere_pruning_method != "disabled":
args_dense = LinearPruningArgs(
method=dense_pruning_method_parts[0],
submethod=dense_pruning_method_parts[1],
ampere_method=sparse_args.ampere_pruning_method,
block_rows=sparse_args.dense_block_rows,
block_cols=sparse_args.dense_block_cols,
bias_mask=bias_mask,
min_elements=linear_min_parameters,
)
if args_dense.submethod.startswith("1d"):
p_dense = ChannelPruningModulePatcher(
patcher_context, args_dense, model_structure=self.model_structure, suffix="dense"
)
else:
p_dense = LinearPruningModulePatcher(patcher_context, args_dense, model_structure=self.model_structure)
else:
p_dense = None
if not hasattr(sparse_args, "attention_output_with_dense") or sparse_args.attention_output_with_dense:
p_att_dense = p_dense
else:
p_att_dense = p_attention_t
module_patchers = dict(
query=p_attention,
key=p_attention,
value=p_attention,
att_dense=p_att_dense,
encoder_decoder_query=p_attention,
encoder_decoder_key=p_attention,
encoder_decoder_value=p_attention,
encoder_decoder_att_dense=p_att_dense,
interm_dense=p_dense,
output_dense=p_dense,
)
if hasattr(sparse_args, "layer_norm_patch"):
layer_norm_patch = sparse_args.layer_norm_patch
else:
layer_norm_patch = False
if hasattr(sparse_args, "gelu_patch"):
gelu_patch = sparse_args.gelu_patch
else:
gelu_patch = False
patcher = LinearModelPatcher(module_patchers, model_structure=self.model_structure)
patcher.patch(model)
model = model.to(device) # TODO: change this by making sure the mask_scores are located at the right place.
self.stats = {}
self.stats["main"] = patcher.stats
if layer_norm_patch:
def schedule_callback():
mix = self.patcher_context.get_context_data("layernorm_to_nonorm_mix")
delta = self.patcher_context.get_context_data("layernorm_to_nonorm_delta")
return dict(mix=mix, delta=delta)
layer_norm_patcher = Layer2NoNormPatcher(schedule_callback=schedule_callback)
layer_norm_patcher.patch(model)
self.stats["layer_norm"] = layer_norm_patcher.stats
if gelu_patch:
def schedule_callback():
mix = self.patcher_context.get_context_data("gelu_to_relu_mix")
return dict(mix=mix)
gelu_patcher = GeLU2ReLUModelPatcher(schedule_callback=schedule_callback)
gelu_patcher.patch(model)
self.stats["gelu"] = gelu_patcher.stats
return patcher
def compile_model(self, model):
self.schedule_threshold(compile=True)
compiler = MaskedLinearModelCompiler()
compiler.patch(model)
if hasattr(self.sparse_args, "layer_norm_patch") and self.sparse_args.layer_norm_patch:
nnc = NoNormCompiler()
nnc.patch(model)
model.config.layer_norm_type = "no_norm"
if hasattr(self.sparse_args, "gelu_patch") and self.sparse_args.gelu_patch:
model.config.hidden_act = "relu"
pruner = BertHeadsPruner(model)
removed_heads, total_heads = pruner.run()
return removed_heads, total_heads