Great,I want to meet you.
在 2012-6-6 9:39 PM， <[email protected]>写道：
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> Today's Topics:
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> 1. In Beijing next week (Gael Varoquaux)
> 2. Re: In Beijing next week (LI Wei)
> 3. Re: In Beijing next week (xinfan meng)
> 4. Re: Error function in the output layer of MLP (David Marek)
> 5. Re: Error function in the output layer of MLP (xinfan meng)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 6 Jun 2012 13:59:01 +0200
> From: Gael Varoquaux <[email protected]>
> Subject: [Scikit-learn-general] In Beijing next week
> To: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=us-ascii
>
> Hey,
>
> Seeing a mail from Xinfan, I just realized that we have a few Chinese
> contributors (and maybe users that I don't know about) that I'd love to
> meet.
>
> I am in Beijing next week for a conference. I am arriving on the 9th and
> leaving on the 15th, although I'll have a busy schedule in the mean time.
> Anybody want's to meet up somewhere? I'll be around the China National
> Convention Center, but I can move around using the metro.
>
> Gael
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 6 Jun 2012 12:06:54 +0000
> From: LI Wei <[email protected]>
> Subject: Re: [Scikit-learn-general] In Beijing next week
> To: [email protected]
> Message-ID:
> <CANXekJAApupmoArt5P9dK3XBAr4kJ_g=2naza2vffp9y-ly...@mail.gmail.com
> >
> Content-Type: text/plain; charset="iso-8859-1"
>
> It is such a pity that I am leaving Beijing for NYC on 9 June. Maybe we
> will meet at the airport by chance :-)
>
> However, I am not a contributor yet but look for a chance to contribute :-(
>
> LI, Wei
>
> On Wed, Jun 6, 2012 at 11:59 AM, Gael Varoquaux <
> [email protected]> wrote:
>
> > Hey,
> >
> > Seeing a mail from Xinfan, I just realized that we have a few Chinese
> > contributors (and maybe users that I don't know about) that I'd love to
> > meet.
> >
> > I am in Beijing next week for a conference. I am arriving on the 9th and
> > leaving on the 15th, although I'll have a busy schedule in the mean time.
> > Anybody want's to meet up somewhere? I'll be around the China National
> > Convention Center, but I can move around using the metro.
> >
> > Gael
> >
> >
> >
> ------------------------------------------------------------------------------
> > Live Security Virtual Conference
> > Exclusive live event will cover all the ways today's security and
> > threat landscape has changed and how IT managers can respond. Discussions
> > will include endpoint security, mobile security and the latest in malware
> > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> > _______________________________________________
> > Scikit-learn-general mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
> >
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> ------------------------------
>
> Message: 3
> Date: Wed, 6 Jun 2012 20:18:01 +0800
> From: xinfan meng <[email protected]>
> Subject: Re: [Scikit-learn-general] In Beijing next week
> To: [email protected]
> Message-ID:
> <CAHvKU2xMsnKjJib-BZ=b2bxexr3x48bossnk8hg7dqns+lw...@mail.gmail.com
> >
> Content-Type: text/plain; charset="utf-8"
>
> That would be cool! It would be my pleasure to mee you. And it would also
> be great to meet other sklearn users in Beijing.
>
> On Wed, Jun 6, 2012 at 7:59 PM, Gael Varoquaux <
> [email protected]> wrote:
>
> > Hey,
> >
> > Seeing a mail from Xinfan, I just realized that we have a few Chinese
> > contributors (and maybe users that I don't know about) that I'd love to
> > meet.
> >
> > I am in Beijing next week for a conference. I am arriving on the 9th and
> > leaving on the 15th, although I'll have a busy schedule in the mean time.
> > Anybody want's to meet up somewhere? I'll be around the China National
> > Convention Center, but I can move around using the metro.
> >
> > Gael
> >
> >
> >
> ------------------------------------------------------------------------------
> > Live Security Virtual Conference
> > Exclusive live event will cover all the ways today's security and
> > threat landscape has changed and how IT managers can respond. Discussions
> > will include endpoint security, mobile security and the latest in malware
> > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> > _______________________________________________
> > Scikit-learn-general mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
> >
>
>
>
> --
> Best Wishes
> --------------------------------------------
> Meng Xinfan?????
> Institute of Computational Linguistics
> Department of Computer Science & Technology
> School of Electronic Engineering & Computer Science
> Peking University
> Beijing, 100871
> China
> -------------- next part --------------
> An HTML attachment was scrubbed...
>
> ------------------------------
>
> Message: 4
> Date: Wed, 6 Jun 2012 14:59:44 +0200
> From: David Marek <[email protected]>
> Subject: Re: [Scikit-learn-general] Error function in the output layer
> of MLP
> To: [email protected]
> Message-ID:
> <caaak9e5lcgcnqxujaglmruucxux3i8tc7k3qwedzn7ks+no...@mail.gmail.com
> >
> Content-Type: text/plain; charset="utf-8"
>
> On Wed, Jun 6, 2012 at 1:50 PM, xinfan meng <[email protected]> wrote:
> >
> > I think these two delta_o have the same meaning. If you have "Pattern
> > Recognition and Machine Learning" by Bishop, you can find that Bishop use
> > exactly the second formula in the back propagation algorithm. I suspect
> > these two formulae lead to the same update iterations, but I can't see
> why
> > now.
> >
>
> Thanks for the idea, I read about NN there and here is my explanation,
> Bishop uses this forward step (page 245):
>
> a_j = \sum_{i=0}^D w_{ji} x_i
> z_j = tanh(a_j)
> y_k = \sum_{j=0}^M w_{kj} z_j
>
> He is using a linear activation function, because it's easy to compute it's
> derivation. ;-) So in this case
> ?w_{ij} = delta_j * x_i
> ?w_{ij} = (y_j - t_j) * x_i
>
> If you'd use another activation function, for example tanh, which can be
> used for classification in current implementation, you'd have
> ?w = (t-y) * dtanh(y) * x
>
> So both pages are correct because each uses different activation function.
>
> The difference is when you have f(x) = w*x then
> f'(x) = x
> while for f(x) = tanh(w*x)
> f'(x) = dtanh(w*x) * x
>
> David
> -------------- next part --------------
> An HTML attachment was scrubbed...
>
> ------------------------------
>
> Message: 5
> Date: Wed, 6 Jun 2012 21:39:22 +0800
> From: xinfan meng <[email protected]>
> Subject: Re: [Scikit-learn-general] Error function in the output layer
> of MLP
> To: [email protected]
> Message-ID:
> <CAHvKU2ywVSm=ffa1t4qeq2s-9qnr8t0i-lmaawbvhcwdzzd...@mail.gmail.com
> >
> Content-Type: text/plain; charset="utf-8"
>
> Yes, I think your explanation is correct. Thanks.
>
> Those notation differences really make me confused, given that MLP is much
> more complex than Perceptron. :-(
>
> On Wed, Jun 6, 2012 at 8:59 PM, David Marek <[email protected]> wrote:
>
> >
> > On Wed, Jun 6, 2012 at 1:50 PM, xinfan meng <[email protected]> wrote:
> >>
> >> I think these two delta_o have the same meaning. If you have "Pattern
> >> Recognition and Machine Learning" by Bishop, you can find that Bishop
> use
> >> exactly the second formula in the back propagation algorithm. I suspect
> >> these two formulae lead to the same update iterations, but I can't see
> why
> >> now.
> >>
> >
> > Thanks for the idea, I read about NN there and here is my explanation,
> > Bishop uses this forward step (page 245):
> >
> > a_j = \sum_{i=0}^D w_{ji} x_i
> > z_j = tanh(a_j)
> > y_k = \sum_{j=0}^M w_{kj} z_j
> >
> > He is using a linear activation function, because it's easy to compute
> > it's derivation. ;-) So in this case
> > ?w_{ij} = delta_j * x_i
> > ?w_{ij} = (y_j - t_j) * x_i
> >
> > If you'd use another activation function, for example tanh, which can be
> > used for classification in current implementation, you'd have
> > ?w = (t-y) * dtanh(y) * x
> >
> > So both pages are correct because each uses different activation
> function.
> >
> > The difference is when you have f(x) = w*x then
> > f'(x) = x
> > while for f(x) = tanh(w*x)
> > f'(x) = dtanh(w*x) * x
> >
> > David
> >
> >
> >
> ------------------------------------------------------------------------------
> > Live Security Virtual Conference
> > Exclusive live event will cover all the ways today's security and
> > threat landscape has changed and how IT managers can respond. Discussions
> > will include endpoint security, mobile security and the latest in malware
> > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> > _______________________________________________
> > Scikit-learn-general mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
> >
> >
>
>
> --
> Best Wishes
> --------------------------------------------
> Meng Xinfan?????
> Institute of Computational Linguistics
> Department of Computer Science & Technology
> School of Electronic Engineering & Computer Science
> Peking University
> Beijing, 100871
> China
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>
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> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>
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