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60 lines
2.3 KiB
Python
60 lines
2.3 KiB
Python
## @package fc
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# Module caffe2.python.layers.fc
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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from caffe2.python import schema
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from caffe2.python.layers.layers import ModelLayer
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from caffe2.python.layers.sampling_trainable_mixin import SamplingTrainableMixin
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import math
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import numpy as np
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class FC(SamplingTrainableMixin, ModelLayer):
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def __init__(self, model, input_record, output_dims, weight_init=None,
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bias_init=None, weight_optim=None, bias_optim=None, name='fc',
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weight_reg=None, bias_reg=None, **kwargs):
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super(FC, self).__init__(model, name, input_record, **kwargs)
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assert isinstance(input_record, schema.Scalar), (
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"Incorrect input type {}".format(input_record))
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assert len(input_record.field_types()[0].shape) > 0, (
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"FC expects limited dimensions of the input tensor")
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input_dims = input_record.field_types()[0].shape[0]
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assert input_dims > 0, (
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"FC expects input dimensions > 0, got {}".format(input_dims))
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scale = math.sqrt(1.0 / input_dims)
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weight_init = weight_init if weight_init else (
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'UniformFill', {'min': -scale, 'max': scale})
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bias_init = bias_init if bias_init else (
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'UniformFill', {'min': -scale, 'max': scale})
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self.w = self.create_param(param_name='w',
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shape=[output_dims, input_dims],
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initializer=weight_init,
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optimizer=weight_optim,
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regularizer=weight_reg)
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self.b = self.create_param(param_name='b',
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shape=[output_dims, ],
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initializer=bias_init,
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optimizer=bias_optim,
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regularizer=bias_reg)
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self.output_schema = schema.Scalar(
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(np.float32, (output_dims, )),
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self.get_next_blob_reference('output')
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)
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def _add_ops(self, net, params):
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net.FC(self.input_record.field_blobs() + params,
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self.output_schema.field_blobs(), **self.kwargs)
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@property
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def param_blobs(self):
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return [self.w, self.b]
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