Problem with ModelForm

I try to Create forms from models
I am facing error message with 'is_valid()'

error is :
{
AttributeError at /add_db/

'Input' object has no attribute 'is_valid'

Request Method: POST
Request URL: http://localhost/django/add_db/
Django Version: 1.2.1
Exception Type: AttributeError
Exception Value:

'Input' object has no attribute 'is_valid'

Exception Location: /home/jagdeep/mysite/add_db/views.py in add_db,
line 11
Python Executable: /usr/bin/python
Python Version: 2.6.5
}

Coded file are given below:
model.py :
from django.db import models
from django.forms import ModelForm

class Input(models.Model):
input1 = models.FloatField()
input2 = models.FloatField()

class Output(models.Model):
out = models.ForeignKey(Input)
output = models.FloatField()

class InputForm(ModelForm):
class Meta :
model = Input

class OutputForm(ModelForm):
class Meta :
model = Output

View.py :
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from mysite.add_db.models import *
from django.template import RequestContext
from django.core.urlresolvers import reverse

def add_db(request):
if request.method == 'POST':
form = Input(request.POST)
if form.is_valid():
cd = form.cleaned_data
input1 = cd['input1']
input2 = cd['input2']
form.save()
output = input1 + input2

return render_to_response('add_db/output.html', {'form':
form, 'input1':input1, 'input2':input2, 'output':output},
context_instance=RequestContext(request))
else:
form = Input()
return render_to_response('add_db/add.html', {'form': form},
context_instance=RequestContext(request))

Please help.

Thanks

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