Fix type inference results for EspNet_AttLoc

[momohatt]

This PR fixes wrong type inference results in EspNet_AttLoc by

• fixing bug in shape inference for chainer.links.Linear
• removing duplicate call to infer_expr for the lazy-initialized variables/attributes, which wrongly overwrote the inference results
• fixing bug(?) in the inference result of the lhs of Assign statement when the lhs is an attribute.

[momohatt]

/test

[pfn-ci-bot]

  [NOT_FOUND] API failed: /a/github_check_membership: HTTP error: 404 Not Found: https://api.github.com/orgs/pfnet-research/public_members/momohatt
  2020-03-01 01:30:06.097256 call.go:272] API failed: /a/github_check_membership

  Stack trace:
    github.com/pfnet/flexci/internal/common/api.callInternal (call.go:272)
    github.com/pfnet/flexci/internal/common/api.Call (call.go:120)
    github.com/pfnet/flexci/internal/common/api.CallWithRetry (call.go:303)
    github.com/pfnet/flexci/internal/common/api.GithubCheckMembership (call.go:506)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.(*githubWebhookIssueCommentFlow).triggerTest (github_issue_comment.go:190)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.(*githubWebhookIssueCommentFlow).Do (github_issue_comment.go:97)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.githubIssueCommentHandler (github_issue_comment.go:45)
    runtime.call64 (asm_amd64.s:523)
    reflect.Value.call (value.go:447)
    reflect.Value.Call (value.go:308)
    github.com/pfnet/flexci/internal/frontend/core.RegisterAPIHandlerInternal.func1 (handler.go:416)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func1 (handler.go:172)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2.1 (handler.go:274)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2 (handler.go:279)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.(*ServeMux).ServeHTTP (server.go:2361)
    github.com/pfnet/flexci/internal/common/api.callInternal.func2 (call.go:196)
    github.com/pfnet/flexci/internal/common/api.callInternal (call.go:204)
    github.com/pfnet/flexci/internal/common/api.Call (call.go:120)
    github.com/pfnet/flexci/internal/common/api.GithubIssueComment (call.go:492)
    github.com/pfnet/flexci/internal/frontend/handler/xternalhandler.githubWebhookHandler (github_webhook.go:118)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func1 (handler.go:172)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2.1 (handler.go:274)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2 (handler.go:279)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.(*ServeMux).ServeHTTP (server.go:2361)
    google.golang.org/appengine/internal.executeRequestSafely (api.go:162)
    google.golang.org/appengine/internal.handleHTTP (api.go:121)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.serverHandler.ServeHTTP (server.go:2741)
    net/http.(*conn).serve (server.go:1847)
    runtime.goexit (asm_amd64.s:1333)

  Cause: [NOT_FOUND] HTTP error: 404 Not Found: https://api.github.com/orgs/pfnet-research/public_members/momohatt
  2020-03-01 01:30:06.063905 github_create_comment.go:91] HTTP error: 404 Not Found: https://api.github.com/orgs/pfnet-research/public_members/momohatt

  Stack trace:
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.callGithubAPI (github_create_comment.go:91)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.callGithubAPIWithRetry (github_create_comment.go:115)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.githubCheckMembershipHandler (github_check_membership.go:37)
    runtime.call64 (asm_amd64.s:523)
    reflect.Value.call (value.go:447)
    reflect.Value.Call (value.go:308)
    github.com/pfnet/flexci/internal/frontend/core.RegisterAPIHandlerInternal.func1 (handler.go:416)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func1 (handler.go:172)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2.1 (handler.go:274)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2 (handler.go:279)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.(*ServeMux).ServeHTTP (server.go:2361)
    github.com/pfnet/flexci/internal/common/api.callInternal.func2 (call.go:196)
    github.com/pfnet/flexci/internal/common/api.callInternal (call.go:204)
    github.com/pfnet/flexci/internal/common/api.Call (call.go:120)
    github.com/pfnet/flexci/internal/common/api.CallWithRetry (call.go:303)
    github.com/pfnet/flexci/internal/common/api.GithubCheckMembership (call.go:506)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.(*githubWebhookIssueCommentFlow).triggerTest (github_issue_comment.go:190)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.(*githubWebhookIssueCommentFlow).Do (github_issue_comment.go:97)
    github.com/pfnet/flexci/internal/frontend/handler/apihandler.githubIssueCommentHandler (github_issue_comment.go:45)
    runtime.call64 (asm_amd64.s:523)
    reflect.Value.call (value.go:447)
    reflect.Value.Call (value.go:308)
    github.com/pfnet/flexci/internal/frontend/core.RegisterAPIHandlerInternal.func1 (handler.go:416)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func1 (handler.go:172)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2.1 (handler.go:274)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2 (handler.go:279)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.(*ServeMux).ServeHTTP (server.go:2361)
    github.com/pfnet/flexci/internal/common/api.callInternal.func2 (call.go:196)
    github.com/pfnet/flexci/internal/common/api.callInternal (call.go:204)
    github.com/pfnet/flexci/internal/common/api.Call (call.go:120)
    github.com/pfnet/flexci/internal/common/api.GithubIssueComment (call.go:492)
    github.com/pfnet/flexci/internal/frontend/handler/xternalhandler.githubWebhookHandler (github_webhook.go:118)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func1 (handler.go:172)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2.1 (handler.go:274)
    github.com/pfnet/flexci/internal/frontend/core.RegisterHandler.func2 (handler.go:279)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.(*ServeMux).ServeHTTP (server.go:2361)
    google.golang.org/appengine/internal.executeRequestSafely (api.go:162)
    google.golang.org/appengine/internal.handleHTTP (api.go:121)
    net/http.HandlerFunc.ServeHTTP (server.go:1964)
    net/http.serverHandler.ServeHTTP (server.go:2741)
    net/http.(*conn).serve (server.go:1847)
    runtime.goexit (asm_amd64.s:1333)

[shinh]

/test

[pfn-ci-bot]

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