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A few MobileNetV3 tweaks

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* fix expansion ratio on early block
* change comment re stride mistake in paper
* fix rounding not being called properly for all multipliers != 1.0
This commit is contained in:
Ross Wightman 2019-05-11 10:23:40 -07:00
parent 6523e4abe4
commit 17da1adaca
1 changed files with 7 additions and 5 deletions
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12
models/genmobilenet.py
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@ -285,7 +285,7 @@ class _BlockBuilder:
def _make_block(self, ba):
bt = ba.pop('block_type')
ba['in_chs'] = self.in_chs
ba['out_chs'] = _round_channels(ba['out_chs'])
ba['out_chs'] = self._round_channels(ba['out_chs'])
ba['bn_momentum'] = self.bn_momentum
ba['bn_eps'] = self.bn_eps
ba['folded_bn'] = self.folded_bn
@ -676,6 +676,7 @@ class GenMobileNet(nn.Module):
# efficient head, currently only mobilenet-v3 performs pool before last 1x1 conv
x = self.global_pool(x) # always need to pool here regardless of bool
x = self.conv_head(x)
# no BN
x = self.act_fn(x)
if pool:
# expect flattened output if pool is true, otherwise keep dim
@ -884,7 +885,7 @@ def _gen_mobilenet_v3(depth_multiplier, num_classes=1000, **kwargs):
# stage 0, 112x112 in
['ds_r1_k3_s1_e1_c16_are_noskip'], # relu
# stage 1, 112x112 in
['ir_r1_k3_s2_e4_c24_are', 'ir_r1_k3_s1_e6_c24_are'], # relu
['ir_r1_k3_s2_e4_c24_are', 'ir_r1_k3_s1_e3_c24_are'], # relu
# stage 2, 56x56 in
['ir_r3_k5_s2_e3_c40_se0.25_are'], # relu
# stage 3, 28x28 in
@ -893,9 +894,10 @@ def _gen_mobilenet_v3(depth_multiplier, num_classes=1000, **kwargs):
# stage 4, 14x14in
['ir_r2_k3_s1_e6_c112_se0.25'], # hard-swish
# stage 5, 14x14in
# FIXME the paper contains a weird block-stride pattern 1-2-1 that doesn't fit the usual 2-1-...
# What is correct?
['ir_r3_k5_s2_e6_c160_se0.25'], # hard-swish
# FIXME paper has a mistaken block-stride pattern 1-2-1 that doesn't fit the usual 2-1-..., ignoring
# The paper numbers result in an exp factor of 4.2 in the middle of this block, but keeping at 6
# results in a param count closer to 5.4m
['ir_r1_k5_s2_e6_c160_se0.25', 'ir_r1_k5_s1_e6_c160_se0.25', 'ir_r1_k5_s1_e6_c160_se0.25'], # hard-swish
# stage 6, 7x7 in
['cn_r1_k1_s1_c960'], # hard-swish
]