48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
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_base_ = [
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'../_base_/datasets/imagenet_bs32_simclr.py',
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'../_base_/schedules/imagenet_lars_coslr_200e.py',
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'../_base_/default_runtime.py',
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]
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# model settings
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model = dict(
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type='SimCLR',
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backbone=dict(
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type='ResNet',
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depth=50,
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norm_cfg=dict(type='SyncBN'),
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zero_init_residual=True),
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neck=dict(
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type='NonLinearNeck', # SimCLR non-linear neck
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in_channels=2048,
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hid_channels=2048,
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out_channels=128,
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num_layers=2,
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with_avg_pool=True),
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head=dict(
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type='ContrastiveHead',
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loss=dict(type='CrossEntropyLoss'),
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temperature=0.1),
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)
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# optimizer
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optim_wrapper = dict(
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type='OptimWrapper',
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optimizer=dict(type='LARS', lr=0.3, momentum=0.9, weight_decay=1e-6),
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paramwise_cfg=dict(
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custom_keys={
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'bn': dict(decay_mult=0, lars_exclude=True),
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'bias': dict(decay_mult=0, lars_exclude=True),
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# bn layer in ResNet block downsample module
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'downsample.1': dict(decay_mult=0, lars_exclude=True),
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}))
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# runtime settings
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default_hooks = dict(
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# only keeps the latest 3 checkpoints
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checkpoint=dict(type='CheckpointHook', interval=10, max_keep_ckpts=3))
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# NOTE: `auto_scale_lr` is for automatically scaling LR
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# based on the actual training batch size.
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auto_scale_lr = dict(base_batch_size=256)
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